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| 1 | General regularity of dynamic responses of slopes under dynamic input显示文摘Through lots of numerical simulations with FLAC3D, dynamic responses of slopes are comprehensively studied in this paper and the general regularities of the isoline of the coefficient of the displacement, velocity and acceleration of the slope section are reached. Given a certain material slope, if the height of the slope is less than a certain value, the displacement, velocity and acceleration linearly enlarge with elevation in the vertical direction; if the height of the slope surpasses the certain value, the displacement,velocity and acceleration do not linearly enlarge with elevation any more, on the other hand, they fluctuate with a certain rhythm. At the same time, the rhythm appears in the horizontal direction, and the displacement, velocity and acceleration of the slope surface enlarge near the slope surface. The distribution form of the isoline of the coefficient of displacement, velocity and acceleration in the section of the slope is remarkably affected by the slope angle. In the certain area near the slope surface, the isoline of displacement,velocity and acceleration is parallel to the surface of the slope; in the mean time the strike direction of the extremum area is parallel to the surface of the slope, too. The charts of the slope dynamic responses can be depicted with two indexes, one is the strike direction of the isoline, and the other is the number of the rhythm extremum area of the direction parallel to the surface of the slope. | QI Shengwen, WU Faquan & SUN Jinzhong Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China College of Engineering Technique, China University of Geosciences, Beijing 100083, China | 2003 | Science China(Technological Sciences)2003，46，z1： | 13 |
| 2 | Phenomena and theoretical analysis for the failure of brittle rocks显示文摘Rockburst, an unstable failure of brittle rocks, has been greatly concerned in rock mechanics and rock engineering for more than 100 years. The current understanding on the mechanical mechanism of rockburst is based on the Coulomb theory, i.e. compressive-shear failure theory. This paper illustrates a series of tensile and tensile-shear fracture phenomena of rockburst, and proposes a methodology for the analysis of fracture mode and its energy dissipation process based on Griffith theory. It is believed that: (1) the fracture modes of rockburst should include compressive-shear, tensile-shear and pure tensile failures; (2) the rupture angle of rock mass decreases with the occurrence of tensile stress; (3) the proportion of kinetic energy in the released strain energy from a rockburst may be much larger than that transferred into surface energy; and (4) the understanding on the tensile and tensile-shear failure modes of rockburst may change the basic thinking of rockburst control, i.e. from keeping the reduction in initial compressive stress σ3 to restricting the creation of secondary tensile stress. | Faquan Wu Jie Wu Shengwen Qi | 2010 | Journal of Rock Mechanics and Geotechnical Engineering2010，2，4： | 5 |
| 3 | Spatial distribution analysis of landslides triggered by 2008.5.12 Wenchuan Earthquake, China显示文摘 | Shengwen Qi Qiang Xu Hengxing Lan Bing Zhang Jianyou Liu | 2010 | Engineering Geology2010，，1： | 1 |
| 4 | Source characteristics of long runout rock avalanches triggered by the 2008 Werichuan earthquake, China显示文摘 | Qi Shengwen Xu Qiang Zhang Bing | 2011 | Journal of Asian Earth Sciences2011，40，4： | 1 |
| 5 | Mechanism of deep cracks in the left bank slope of Jinping first stage hydropower station显示文摘 | Qi Shengwen Wu Faquan Yan Fuzhang | 2004 | Engineering Geology2004，73，12： | 1 |
| 6 | Application of cross-hole radar tomography in karst area显示文摘 | TAN Hanhua HUANG Jiahui QI Shengwen | 2011 | Environmental Earth Sciences2011，66，1： | 1 |
| 7 | Source characteristics of long runout rock avalanches triggered by the 2008 Wenchuan earthquake, China显示文摘 | QI SHENGWEN XU QIANQ ZHANG BINQ | 2011 | Journal of Asian Earth Science2011，40，4： | 1 |
| 8 | Influence of deep seated discontinuities on the left slope of Jinping I Hydropower Station and its stability analysis显示文摘 | Shengwen Qi Faquan Wu Yuande Zhou Yuhuan Song Manfu Gong | 2010 | Bulletin of Engineering Geology and the Environment2010，，3： | 1 |
| 9 | Heterogeneity induced strain localization in block-in-matrix-soils subjected to uniaxial loading using real-time CT scanning显示文摘Block-in-matrix-soils(bimsoils)are geological mixtures that have distinct structures consisting of relatively strong rock blocks and weak matrix soils.It is still a challenge to evaluate the mechanical behaviors of bimsoils because of the heterogeneity,chaotic structure,and lithological variability.As a result,only very limited laboratory studies have been reported on the evolution of their internal deformation.In this study,the deformation evolution of bimsoils under uniaxial loading is investigated using real-time X-ray computed tomography(CT)and image correlation algorithm(with a rock block percentage(RBP)of 40%).Three parameters,i.e.heterogeneity coefficient(K),correlation coefficient(CC),and standard deviation(STD)of displacement fields,are proposed to quantify the heterogeneity of the motion of the rock blocks and the progressive deformation of the bimsoils.Experimental results show that the rock blocks in bimsoils are prone to forming clusters with increasing loading,and the sliding surface goes around only one side of a cluster.Based on the movement of the rock blocks recorded by STD and CC,the progressive deformation of the bimsoils is quantitatively divided into three stages:initialization of the rotation of rock blocks,formation of rock block clusters,and formation of a shear band by rock blocks with significant rotation.Moreover,the experimental results demonstrate that the meso-motion of rock blocks controls the macroscopic mechanical properties of the samples. | Yanfang Wu Xiao Li Luqing Zhang Shengwen Qi Jian Zhou Jianming He Zhaobin Zhang Xiukuo Sun | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，8： | 0 |
| 10 | Experimental Research on Supercritical Carbon Dioxide Fracturing of Sedimentary Rock:A Critical Review显示文摘Supercritical carbon dioxide(ScCO_(2))fracturing has great advantages and prospects in both shale gas exploitation and CO_(2)storage.This paper reviews current laboratory experimental methods and results for sedimentary rocks fractured by ScCO_(2).The breakdown pressure,fracture parameters,mineral composition,bedding plane angle and permeability are discussed.We also compare the differences between sedimentary rock and granite fractured by ScCO_(2),ultimately noting problems and suggesting solutions and strategies for the future.The analysis found that the breakdown pressure of ScCO_(2)was reduced 6.52%–52.31%compared with that of using water.ScCO_(2)tends to produce a complex fracture morphology with significantly higher permeability.When compared with water,the fracture aperture of ScCO_(2)was decreased by 4.10%–72.33%,the tortuosity of ScCO_(2)was increased by 5.41%–70.98%and the fractal dimension of ScCO_(2)was increased by 4.55%–8.41%.The breakdown pressure of sandstone is more sensitive to the nature of the fracturing fluid,but fracture aperture is less sensitive to fracturing fluid than for shale and coal.Compared with granite,the tortuosity of sedimentary rock is more sensitive to the fracturing fluid and the fracture fractal dimension is less sensitive to the fracturing fluid.Existing research shows that ScCO_(2)has the advantages of low breakdown pressure,good fracture creation and environmental protection.It is recommended that research be conducted in terms of sample terms,experimental conditions,effectiveness evaluation and theoretical derivation in order to promote the application of ScCO_(2)reformed reservoirs in the future. | ZHENG Bowen QI Shengwen LU Wei GUO Songfeng WANG Zan YU Xin ZHANG Yan | 2023 | Acta Geologica Sinica(English Edition)2023，97，3： | 0 |
| 11 | Long-Term Settlement Characterization of High-Filling Foundation in the Mountain Excavation and City Construction Area of the Yan’an New District,China显示文摘Mountain Excavation and City Construction(MECC)represents a prominent anthropogenic endeavor aimed at facilitating urban expansion in the Loess Plateau of China.It is important to comprehend the long-term settlement behavior at MECC engineering sites to effectively assess the project’s success in reshaping landscapes and expanding urban areas.In this study,a typical MECC project,specifically the upstream area of the Liujiagou Valley within the new district of Yan’an City,is selected as a case study to investigate long-term settlement characteristics.The research involved conducting creep tests on soil samples with varying dry densities and moisture content and continuous in-situ monitoring of ground surface settlement at 17 specific points.Furthermore,a numerical model was developed and calibrated using the in-situ monitoring data to predict the long-term settlement.The findings reveal that an increase in soil dry density and a decrease in soil water content contribute to reduced deformation.Notably,settlement primarily manifests within the filled areas,with greater soil thickness exacerbating settlement effects.Over time,cumulative settlement exhibits a progressively diminishing rate of deformation until it attains a stable state.These results provide insights for assessing the long-term stability of MECC projects,facilitating decision-making in future endeavors within this region. | Xiaokun Hou Shengwen Qi Yongtang Yu Jianguo Zheng | 2023 | Journal of Earth Science2023，34，6： | 0 |
| 12 | Ultrathin lead-free double perovskite cesium silver bismuth bromide nanosheets显示文摘Two-dimensional (2D) lead halide perovskites nanostructures have drawn great fundamental interest and displayed excellent properties for various optoelectronic applications. However, the toxicity of lead remains a concern for their large-scale utilizations. Bismuth halide double perovskites stand out as a class of promising candidates for lead-free halide perovskites. In this work, we demonstrate the first synthesis of lead-free 2D halide double perovskite nanosheets. The synthesized Cs2AgBiBr6 nanosheets exhibited thicknesses in the range of 3–5 nm and lateral dimensions of ∼ 200 nm. The nanosheets showed a strong absorption peak centered at ∼ 430 nm and the photoluminescence emission observed at ∼ 630 nm. We also explored dimensionality control from zero-dimensional nanocubes to 2D nanosheets and investigated the preferential growth of Cs2AgBiBr6 over other related compounds such as Cs3Bi2Br9 and CsAgBr2. Our study reveals that Cs2AgBiBr6 nanosheets are interesting 2D material for potential optoelectronic applications and provides a guideline for the controllable synthesis of multi-component compounds with tunable morphology, dimensionality and phase. | Jianmei Huang Shengwen Zou Jia Lin Zhiwei Liu Mingjing Qi | 2021 | Nano Research2021，14，11： | 0 |
| 13 | Experimental study on seismic response and progressive failure characteristics of bedding rock slopes显示文摘Bedding rock slopes are common geological features in nature that are prone to failure under strong earthquakes. Their failures induce catastrophic landslides and form barrier lakes, posing severe threats to people’s lives and property. Based on the similarity criteria, a bedding rock slope model with a length of3 m, a width of 0.8 m, and a height of 1.6 m was constructed to facilitate large-scale shaking table tests.The results showed that with the increase of vibration time, the natural frequency of the model slope decreased, but the damping ratio increased. Damage to the rock mass structure altered the dynamic characteristics of the slope;therefore, amplification of the acceleration was found to be nonlinear and uneven. Furthermore, the acceleration was amplified nonlinearly with the increase of slope elevation along the slope surface and the vertical section, and the maximum acceleration amplification factor(AAF) occurred at the slope crest. Before visible deformation, the AAF increased with increasing shaking intensity;however, it decreased with increasing shaking intensity after obvious deformation. The slope was likely to slide along the bedding planes at a shallow depth below the slope surface. The upper part of the slope mainly experienced a tensile-shear effect, whereas the lower part suffered a compressive-shear force. The progressive failure process of the model slope can be divided into four stages, and the dislocated rock mass can be summarized into three zones. The testing data provide a good explanation of the dynamic behavior of the rock slope when subjected to an earthquake and may serve as a helpful reference in implementing antiseismic measures for earthquake-induced landslides. | Mingdong Zang Guoxiang Yang Jinyu Dong Shengwen Qi Jianxian He Ning Liang | 2022 | Journal of Rock Mechanics and Geotechnical Engineering2022，14，5： | 0 |
| 14 | Geological evaluation for the carbon dioxide geological utilization and storage(CGUS)site:A review显示文摘Carbon dioxide(CO_(2))geological utilization and storage(CGUS)is the key link of CO_(2)capture,utilization,and storage(CCUS).The accurate characterization of the geological body structure is a vital prerequisite of CGUS.This paper gives a review of the multi-scale three-dimensional geological structure characterization and site selection of CO_(2)storage.It shows that there is a lack of systematic and high-precision methods for transparency characterization of multi-scale three-dimensional engineering geological structure and hydrogeological structure of a CO_(2)storage site.There is no clear understanding of the fracture evolution and gas-liquid migration process of multi-scale geological body structure under the disturbance of CO_(2)injection.There is a lack of sufficient quantitative methods for the dynamic evaluation of CO_(2)geological storage potential.The geological suitability evaluation method for site selection of CO_(2)storage is rough and has poor applicability,which is difficult to satisfy the urgent needs of CGUS site selection in the whole process of CO_(2)sequestration industrialization in the future.Thus,it is required to conduct studies on the transparency characterization of geological body structure and intelligent site selection for CO_(2)storage,which is of great importance for CGUS engineering practice. | Shengwen QI Bowen ZHENG Zan WANG Haijun ZHAO Zhendong CUI Tianming HUANG Songfeng GUO Lei FU Pingchuan DONG | 2023 | Science China Earth Sciences2023，66，9： | 0 |
| 15 | Dynamic response of mountain tunnel,bridge,and embankment along the Sichuan-Tibet transportation corridor to active fault based on model tests显示文摘The Sichuan-Tibet transportation corridor is prone to numerous active faults and frequent strong earthquakes.While extensive studies have individually explored the effect of active faults and strong earthquakes on different engineering structures,their combined effect remains unclear.This research employed multiple physical model tests to investigate the dynamic response of various engineering structures,including tunnels,bridges,and embankments,under the simultaneous influence of cumulative earthquakes and stick-slip misalignment of an active fault.The prototype selected for this study was the Kanding No.2 tunnel,which crosses the Yunongxi fault zone within the Sichuan-Tibet transportation corridor.The results demonstrated that the tunnel,bridge,and embankment exhibited amplification in response to the input seismic wave,with the amplification effect gradually decreasing as the input peak ground acceleration(PGA)increased.The PGAs of different engineering structures were weakened by the fault rupture zone.Nevertheless,the misalignment of the active fault may decrease the overall stiffness of the engineering structure,leading to more severe damage,with a small contribution from seismic vibration.Additionally,the seismic vibration effect might be enlarged with the height of the engineering structure,and the tunnel is supposed to have a smaller PGA and lower dynamic earth pressure compared to bridges and embankments in strong earthquake zones crossing active faults.The findings contribute valuable insights for evaluating the dynamic response of various engineering structures crossing an active fault and provide an experimental reference for secure engineering design in the challenging conditions of the Sichuan-Tibet transportation corridor. | HUANG Beixiu QIAO Sijia CHEN Xulei LI Lihui QI Shengwen | 2024 | Journal of Mountain Science2024，21，1： | 0 |
| 16 | Investigation on the Deformation and Failure Patterns of Loess Cut Slope Based on the Unsaturated Triaxial Test in Yan'an,China显示文摘The large-scale implementation of the Gully Stabilization and Land Reclamation(GSLR)project induces various failures of loess slopes due to excavation in Yan'an,China.However,the deformation and failure behavior of these excavated loess slopes have not been fully understood.In this study,field investigation was undertaken for analyzing the distributions and failure features of excavation-induced loess slope failures.It is found that plastic failure mainly occurs in Q_(3) loess layers and brittle failure in Q_(2).To understand the underlying failure mechanism,a series of triaxial shear tests were conducted on intact Q_(3) and Q_(2) loess samples that with different water contents,namely natural water content(natural),dry side of the natural value(drying 5%),and wet side(wetting 5%).The characteristics of stress-strain curves and failure modes of the samples were analyzed.Results show that the stress-strain curves of Q_(2) samples are dominated by strain-softening characteristics,while Q_(3) samples mainly exhibit strain-harden features except in the drying state.Correspondingly,shear failures of Q_(3) specimens are mainly caused by shear crack planes(single,X or V-shaped).For Q_(2) loess,the dominance of tensile cracks is observed on the surface of damaged specimens.These disclose the different failure modes of excavated slopes located in different strata,that is,the arc sliding failure of Q_(3) loess slopes and the stepped tensile failure of Q_(2) loess slopes,and are helpful in the design and management of the ongoing GSLR projects in the Loess Plateau. | Lina Ma Shengwen Qi Songfeng Guo Qiangbing Huang Xiaokun Hou | 2024 | Journal of Earth Science2024，35，1： | 0 |
| 17 | Shear mechanical properties and energy evolution of rock-like samples containing multiple combinations of non-persistent joints显示文摘Discontinuities are often considered as important factors responsible for the instability caused by shear failure in engineering rock mass,and energy-driven instability is the root cause of rock failure.However,few studies focus on the energy evolution during the failure process using a three-dimensional(3D)numerical model.In this study,a series of laboratory direct shear tests on rock-like samples is numer-ically simulated using bonded particle models(BPMs)with multiple combinations of discontinuous in the particle flow code(PFC3D),in which the location and size of the particles conform to the uniform distribution.The effects of joint row number and inclination on the stress-strain characteristics and failure mode of rock were studied from the perspective of microcrack growth and energy evolution.The results showed that,when the number of joint rows Nr>1,the shear failure region does not change with the increase of Nr for the type B(2-columnn multiple-row at center)and the type C(2-column multiple-row at edge)as compared to the type A(1-column multiple-row at center)joint models.Notably,joints significantly increase the post-peak energy dissipation but have little effect on the proportion of energy before the peak.Friction consumes most of the energy while kinetic energy accounts for less than 1%of total energy during the shear process.Peak elastic strain energy follows the variation trend of peak shear displacement.The development and accumulation of microcracks directly affect the energy dissipation,and there is a significant linear relationship between the cumulative number of critical microcracks and the critical dissipated energy at the failure,when the dip direction of joints is opposite to the shear direction,more microcracks will be accumulated at the peak time,resulting in more energy dissipation.The results contribute to deeply understanding the shear failure process of non-persistent jointed mass. | Daping Tai Shengwen Qi Bowen Zheng Chonglang Wang Songfeng Guo Guangming Luo | 2023 | Journal of Rock Mechanics and Geotechnical Engineering2023，15，7： | 0 |
| 18 | Damage evolution of rock-encased-backfill structure under stepwise cyclic triaxial loading显示文摘Rock-encased-backfill(RB)structures are common in underground mining,for example in the cut-andfill and stoping methods.To understand the effects of cyclic excavation and blasting activities on the damage of these RB structures,a series of triaxial stepwise-increasing-amplitude cyclic loading experiments was conducted with cylindrical RB specimens(rock on outside,backfill on inside)with different volume fractions of rock(VF=0.48,0.61,0.73,and 0.84),confining pressures(0,6,9,and 12 MPa),and cyclic loading rates(200,300,400,and 500 N/s).The damage evolution and meso-crack formation during the cyclic tests were analyzed with results from stress-strain hysteresis loops,acoustic emission events,and post-failure X-ray 3D fracture morphology.The results showed significant differences between cyclic and monotonic loadings of RB specimens,particularly with regard to the generation of shear microcracks,the development of stress memory and strain hardening,and the contact forces and associated friction that develops along the rock-backfill interface.One important finding is that as a function of the number of cycles,the elastic strain increases linearly and the dissipated energy increases exponentially.Also,compared with monotonic loading,the cyclic strain hardening characteristics are more sensitive to rising confining pressures during the initial compaction stage.Another finding is that compared with monotonic loading,more shear microcracks are generated during every reloading stage,but these microcracks tend to be dispersed and lessen the likelihood of large shear fracture formation.The transition from elastic to plastic behavior varies depending on the parameters of each test(confinement,volume fraction,and cyclic rate),and an interesting finding was that the transformation to plastic behavior is significantly lower under the conditions of 0.73 rock volume fraction,400 N/s cyclic loading rate,and 9 MPa confinement.All the findings have important practical implications on the ability of backfill to support underground excavations. | Xin Yu Yuye Tan Weidong Song John Kemeny Shengwen Qi Bowen Zheng Songfeng Guo | 2024 | Journal of Rock Mechanics and Geotechnical Engineering2024，16，2： | 0 |
| 19 | Frequency Analysis of Heavy Tamping Vibration显示文摘Heavy tamping is one of the important methods for ground treatment. But the vibration is often a problem that restricts the application during heavy tamping. On the other hand, as an instant impact load with controllable energy, heavy tamping is a good test in situ for the study of soil dynamics. With the analysis in the field of frequency, deductive method for medium effecting function and excitation function of heavy tamping is put forward in this paper. | Sun Jinzhong College of Engineering and Technology, China University of Geosciences, Beijing 100083 Tan Hanhua Guizhou Institute of Communication Design, Guiyang 550001 Qi Shengwen Institute of Geology, Chinese Academy of Sciences, Beijing 10002 | 2001 | Journal of China University of Geosciences2001，12，2： | 0 |
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