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| 1 | Visualization of the complex structure and stress field inside rock by means of 3D printing technology显示文摘Accurate characterization and visualization of the complex inner structure and stress distribution of rocks are of vital significance to solve a variety of underground engineering problems. In this paper, we incorporate several advanced technologies, such as CT scan, three-dimensional(3D) reconstruction, and 3D printing, to produce a physical model representing the natural coal rock that inherently contains complex fractures or joints. We employ 3D frozen stress and photoelastic technologies to characterize and visualize the stress distribution within the fractured rock under uniaxial compression. The 3D printed model presents the fracture structures identical to those of the natural prototype. The mechanical properties of the printed model,including uniaxial compression strength, elastic modulus,and Poisson's ratio, are testified to be similar to those of the prototype coal rock. The frozen stress and photoelastic tests show that the location of stress concentration and the stress gradient around the discontinuous fractures are in good agreement with the numerical predictions of the real coalsample. The proposed method appears to be capable of visually quantifying the influences of discontinuous,irregular fractures on the strength, deformation, and stress concentration of coal rock. The method of incorporating3 D printing and frozen stress technologies shows a promising way to quantify and visualize the complex fracture structures and their influences on 3D stress distribution of underground rocks, which can also be used to verify numerical simulations. | Yang Ju Heping Xie Zemin Zheng Jinbo Lu Lingtao Mao Feng Gao Ruidong Peng | 2014 | Chinese Science Bulletin2014，59，36： | 41 |
| 2 | Energy analysis and criteria for structural failure of rocks显示文摘The intrinsic relationships between energy dissipation,energy release,strength and abrupt structural failure are key to understanding the evolution of deformational processes in rocks.Theoretical and experimental studies confirm that energy plays an important role in rock deformation and failure.Dissipated energy from external forces produces damage and irreversible deformation within rock and decreases rock strength over time.Structural failure of rocks is caused by an abrupt release of strain energy that manifests as a catastrophic breakdown of the rock under certain conditions.The strain energy released in the rock volume plays a pivotal role in generating this abrupt structural failure in the rocks.In this paper,we propose criteria governing(1) the deterioration of rock strength based on energy dissipation and(2) the abrupt structural failure of rocks based on energy release.The critical stresses at the time of abrupt structural failure under various stress states can be determined by these criteria.As an example,the criteria have been used to analyze the failure conditions of surrounding rock of a circular tunnel. | Heping Xie Liyun Li Ruidong Peng Yang Ju | 2009 | Journal of Rock Mechanics and Geotechnical Engineering2009，1，1： | 39 |
| 3 | Energy analysis for damage and catastrophic failure of rocks显示文摘The development history and current state of studies on the characteristics and mechanisms of deformation and failure of rock materials were briefly reviewed from the viewpoint of energy.The main scope and the achievable objectives of the energy-based research system were expatiated.It was validated by experiments that the damage process of rocks can be well described by the rock damage evolution equation established based on energy dissipation.It was found from the uniaxial compression and biaxial compression tests that only a small proportion of the total input energy in hard rocks is dissipated before peak load and a large proportion in soft rocks is dissipated before peak load.For both hard and soft rocks,the energy dissipated after peak load accounts for a greater proportion.More energy would be required for rock failure under equal biaxial compression than under unequal biaxial compression.The total absorbed energy is different for rock failure under high-rate loading and low-rate loading.More fragmented failure pattern usually corresponds to higher energy absorption.The mesoscopic analysis on the damage and failure of bedded salt rocks showed that the energy dissipation is prominent and the total absorbed energy for rock failure is low when cracks propagate in the weak mud interlayer while it is contrary when cracks propagate in the salt rock.The energy accumulation,transfer,dissipation and release during the failure process of tunnel with impending failure under disturbance were analyzed theoretically based on the elastoplastic mechanics theory.Furthermore,the spatial distribution of energy dissipation and energy release of fractured rocks under unloading was simulated numerically.It was demonstrated that energy is likely to be released from the weakest surface under compression,which triggers the global failure of rocks. | XIE HePing 1,2,LI LiYun 2,1,JU Yang 2,PENG RuiDong 2 & YANG YongMing 2 1 Sichuan University,Chengdu 610065,China 2 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete,China University of Mining and Technology,Beijing 100083,China | 2011 | Science China(Technological Sciences)2011，54，S1： | 29 |
| 4 | Computation of fractal dimension of rock pores based on gray CT images显示文摘The characterization of pore structure in rocks is relevant in determining their various mechanical behaviors. Digital image processing methods integrated with fractal theory were applied to analyze images of rock slices obtained from industry CT, elucidating the characteristics of rock pore structure and the relationship between porosity and fractal dimensions. The gray values of pixels in CT images of rocks provide comprehensive results with respect to the attenuation coefficients of various materials in corresponding rock elements, and these values also reflect the effect of rock porosity at various scales. A segmentation threshold can be determined by inverse analysis based on the pore ratios that are measured experimentally, and subsequently binary images of rock pores can be obtained to study their topological structures. The fractal dimension of rock pore structure increases with an increase in rock pore ratio, and fractal dimensions might differ even if pore ratios are the same. The more complex the structure of a rock, the larger the fractal dimension becomes. The experimental studies have validated that fractal dimension calculated directly from gray CT images of rocks can give an effective complementary parameter to use alongside pore ratios and they can suitably represent the fractal characteristics of rock pores. | PENG RuiDong YANG YanCong JU Yang MAO LingTao YANG YongMing | 2011 | Chinese Science Bulletin2011，56，31： | 25 |
| 5 | Progress and significance in research on the early Middle Cambrian Kaili Biota, Guizhou Province, China显示文摘Important progress in research on the Kaili Biota has been made recently. Many interesting components from Chengjiang Biota and Burgess Shale Biota have been discovered, e.g. Microdictyon of lobopodia; Ottoia, Palaeoscolex of worms; Naraoia, Marrella of Trilobitioidea, Mollisonia, anamalocarids and other non-trilobite arthropods; and new sorts of echinoder-mas, macroalage fossils and so on. Recent work on the Kaili Biota has resulted in the following developments: (i) an increase in the number of animal genera, up to more than 100 genera in total, so that the Kaili Biota has become the third most diverse of the Burgess Shale-type Biota after the Burgess Shale and Chengjiang Biotas; and (ii) the most noteworthy fossils in the Kaili Biota are echinoderms, non-trilobite arthropods and soft-bodied medusiform fossils, especially the most diverse echinoderms. The progress provides envidence for the biodiversity of marine organisms presented after the 'Cambrian Explosion' and serves as a link between the earlist Cambrian Chengjiang Biota and late early Middle Cambrian Burgess Shale Biota. It is of great significance in the reconstruction of the Cambrian palaeoplate, palaeongeography and in research on taphonomy. | ZHAO Yuanlong, YUAN Jinliang, ZHU Maoyan, YANG Ruidong, GUO Qingjun, PENG Jin and YANG Xinglian(1. Institute of Paleontology and Biomineralization, School of Resource and Environment, Guizhou University of Technology, Guiyang 550003, China: 2. Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China 3. Guiyang Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550003, China) | 2002 | Progress in Natural Science:Materials International2002，12，9： | 20 |
| 6 | New data regarding acritarch biostratigraphy from the Early-Middle Cambrian Kaili Formation in Chuandong,Guizhou Province,China显示文摘Previous studies had evaluated acritarchs from the Balang and Pingzhai sections of the Early-Middle Cambrian Kaili Formation in east Guizhou,China.The results of these studies suggest that the acritarchs in these sections have potential biostratigraphic significance.More recently,34 samples collected from 83 m lower part of the Lower-Middle Cambrian Kaili Formation in the Jianshan section of Chuandong,Guizhou Province were prepared for palynological analysis.Analysis of these samples revealed a distinct change in the acritarch assemblages at the bed,which was approximately 46 m above the bottom of the Kaili Formation.These findings suggest a boundary represented by an important alteration of the ecological environment.In addition,the position of the acritarch biostratigraphic change is somewhat higher than the boundary between Cambrian Series 2 and Series 3 based on trilobites found in the same section.This indicates that the distinct change in acritarch assemblages is similar to the change in trilobite assemblages that occurs around the boundary between Cambrian Series 2 and Series 3.Therefore,acritarch biostratigraphy can provide data that can be used to define the base of Cambrian Series 3 in this region,and possibly worldwide. | Leiming Yin Ruidong Yang Jin Peng Fanfan Kong | 2009 | Progress in Natural Science:Materials International2009，19，1： | 9 |
| 7 | A new section of Kaili Formation (Cambrian) and a biostratigraphic study of the boundary interval across the undefined Cambrian Series 2 and Series 3 at Jianshan,Jianhe County,China with a discussion of global correlation based on the first appearance dat显示文摘在 Jianshan 的 Kaili 形成的新节的三叶虫 biostratigraphic 研究, Chuandong 村庄, Jianhe 县,贵州被报导。与 Ovatoryctocara granulata Bathynotus holopygus 地区和原来在 Kaili 的 Wuliu-Zengjiayan 节从三叶虫集合被定义的 overlying Oryctocephalus indicus 地区联系的关键种类的另外的出现从这新节被报导。Oryctocephalus indicus 的第一本外观资料(一度时髦的风尚) 在单位的底上面发生在 44.52 m。基于丰富的标本的学习(n = 800 ) 从 Kaili 形成,我们主张那 Oryctocephalus indicus 是普遍的税在上与全球分布。O。reticulatus (Lermontova, 1940 ) 从在西伯利亚和 O 的 Molodo 河区域的 Amganian 阶段的 Kounamkites 地区的中间的部分。americanus (Sundberg 和 McCollum, 2003 ) 从内华达,北美洲类似于 O 的代表。发生在 O 的 indicus。Kaili 形成的 indicus 地区。O。reticulatus 和 O。americanus 这里与 O 被举出。indicus (里德, 1910 ) 。这研究为未命名的寒武纪的系列 3 的底为全球 Stratotype 作为候选人节加强 Kaili 形成的 Wuliu-Zengjiayan 节。 | Yuanlong Zhao Jinliang Yuan Shanchi Peng Loren E. Babcock Jin Peng Qingjun Guo Jihpai Lin Tongshu Tai Ruidong Yang Yuxian Wang | 2008 | Progress in Natural Science:Materials International2008，18，12： | 8 |
| 8 | Application of Steel fibre reinforced sprayed concrete to a deep tunnel in weak rocks Journal of Coal Science & Engineering (China)显示文摘 | Zhou Hongwei Peng Ruidong Li Zhendong Dong Zhengzhu Chen Wenwei Wang Jian | 2002 | 18(2):49 -542002，18，2： | 1 |
| 9 | HMGB1 recruits myeloid derived suppressor cells to promote peritoneal dissemination of colon cancer after resection显示文摘 | Wei Li Ke Wu Ende Zhao Liang Shi Ruidong Li Peng Zhang Yuping Yin Xiaoming Shuai Guobin Wang Kaixiong Tao | 2013 | Biochemical and Biophysical Research Communicatio2013，，： | 1 |
| 10 | Protective effects of IRG1/itaconate on acute colitis through the inhibition of gasdermins-mediated pyroptosis and inflammation response显示文摘Inflammatory bowel disease(IBD)is a chronic relapsing gastrointestinal disorder,while the treatment effect is not satisfactory.Immune responsive gene 1(IRG1)is a highly ex-pressed gene in macrophage in response to inflammatory response and catalyzes the production of itaconate.Studies have reported that IRG1/itaconate has a significant antioxidant effect.This study aimed to investigate the effect and mechanism of IRG1/itaconate on dextran sulfate so-dium(DSS)-induced colitis in vivo and in vitro.In vivo experiments,we found IRG1/itaconate ex-erted protective effects against acute colitis by increasing mice weight,the length of colon,reducing disease activity index and colonic inflammation.Meanwhile,IRG1 deletion aggravated the macrophages/CD4+/CD8+T-cell accumulation,and increased the release of interleukin(IL)-1b,tumor necrosis factor-a(TNF-a),IL-6,the activation of nuclear factor-kB(NF-kB)/mitogen-activated protein kinase(MAPK)signaling pathway,and gasdermin D(GSDMD)mediated pyrop-tosis.Four-octyl itaconate(4-OI),a derivative of itaconate,attenuated these changes,therefore relieved DSS-induced colitis.In vitro experiment,we found 4-OI inhibited the reactive oxygen species production,thereby inhibiting the activation of MAPK/NF-kB signaling pathway in RAW264.7 and murine bone-marrow-derived macrophages.Simultaneously,we found 4-OI inhib-ited caspase1/GSDMD-mediated pyroptosis to reduce the release of cytokines.Finally,we found anti-TNF-a agent reduced the severity of DSS-induced colitis and inhibited gasdermin E(GSDME)-mediated pyroptosis in vivo.Meanwhile,our study revealed that 4-OI inhibited caspase3/GSDME-mediated pyroptosis induced by TNF-a in vitro.Taken together,IRG1/itaconate exerted a pro-tective role in DSS-induced colitis by inhibiting inflammatory response and GSDMD/GSDME-medi-ated pyroptosis,which could be a promising candidate for IBD therapy. | Wenchang Yang Yaxin Wang Tao Wang Chengguo Li Liang Shi Peng Zhang Yuping Yin Kaixiong Tao Ruidong Li | 2023 | Genes & Diseases2023，10，4： | 0 |
| 11 | Research progress and application of deep in-situ condition preserved coring and testing显示文摘With the depletion of shallow resources,the exploration of deep earth resources has become a global strategy.The study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core specimens.Based on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are developed.This principle and technology consists of five parts:in-situ pressurepreserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperaturepreserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisturepreserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial production was completed by following the principle of displacement and tests based on the in-situ reconstructed environment.The notable advances are as follows:(1)Deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,highperformance(temperature-resistant,pressure-resistant,and low thermally conductive)temperaturepreserved materials,an active temperature control system,and high-barrier quality-preserved membrane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displacement storage system and ultrahigh pressure cabin structure was completed,which could realize docking the coring device and core displacement in the in-situ reconstructed environment.(3)Test analysis system:A noncontact acoustic-electric-magnetic test system was developed under the in-situ reconstructed environment,and the errors between the test results and traditional contact test results were mostly less than 10%;a detachable deep in-situ core true triaxial test system was developed,which could perform loading tests for deep in-situ cores.The relevant technological achievements were successfully applied to the exploration and development of deep resources,such as deep mines,deep-sea natural gas hydrates,and deep oil and gas.The research results provide technical and equipment support for the construction of a theoretical system for deep in-situ rock mechanics,the development of deep earth resources and energy,and the scientific exploration of different layers and occurrence depths(deep and ultradeep)of the Earth. | Heping Xie Yunqi Hu Mingzhong Gao Ling Chen Ru Zhang Tao Liu Feng Gao Hongwei Zhou Xiaobo Peng Xiongjun Li Jianbo Zhu Cunbao Li Ruidong Peng Yanan Gao Cong Li Jianan Li Zhiqiang He | 2023 | International Journal of Mining Science and Technology2023，33，11： | 0 |
| 12 | Numerical analysis on mechanical difference of sandstone under in-situ stress,pore pressure preserved environment at depth显示文摘Deep in-situ rock mechanics considers the influence of the in-situ environment on mechanical properties,differentiating it from traditional rock mechanics.To investigate the effect of in-situ stress,pore pressure preserved environment on the mechanical difference of sandstone,four tests are numerically modeled by COMSOL:conventional triaxial test,conventional pore pressure test,in-situ stress restoration and reconstruction test,and in-situ pore pressure-preserved test(not yet realized in the laboratory).The in-situ stress restoration parameter is introduced to characterize the recovery effect of in-situ stress on elastic modulus and heterogeneous distribution of sandstone at different depths.A random function and nonuniform pore pressure coefficient are employed to describe the non-uniform distribution of pore pressure in the in-situ environment.Numerical results are compared with existing experimental data to validate the models and calibrate the numerical parameters.By extracting mechanical parameters from numerical cores,the stress-strain curves of the four tests under different depths,in-situ stress and pore pressure are compared.The influence of non-uniform pore pressure coefficient and depth on the peak strength of sandstone is analyzed.The results show a strong linear relationship between the in-situ stress restoration parameter and depth,effectively characterizing the enhanced effect of stress restoration and reconstruction methods on the elastic modulus of conventional cores at different depths.The in-situ pore pressurepreserved test exhibits lower peak stress and peak strain compared to the other three tests,and sandstone subjected to non-uniform pore pressure is more prone to plastic damage and failure.Moreover,the influence of non-uniform pore pressure on peak strength gradually diminished with increasing depth. | Hongwei Zhou Mingyuan Lu Heping Xie Wenhao Jia Ruidong Peng Yimeng Wang Bocen Chen Pengfei Jing | 2023 | International Journal of Mining Science and Technology2023，33，11： | 0 |
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