|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Preliminary engineering application of microseismic monitoring technique to rockburst prediction in tunneling of Jinping Ⅱ project显示文摘Monitoring and prediction of rockburst remain to be worldwide challenges in geotechnical engineering.In hydropower,transportation and other engineering fields in China,more deep,long and large tunnels have been under construction in recent years and underground caverns are more evidently featured by 'long,large,deep and in group',which bring in many problems associated with rock mechanics problems at great depth,especially rockburst.Rockbursts lead to damages to not only underground structures and equipments but also personnel safety.It has been a major technical bottleneck in future deep underground engineering in China.In this paper,compared with earthquake prediction,the feasibility in principle of monitoring and prediction of rockbursts is discussed,considering the source zones,development cycle and scale.The authors think the feasibility of rockburst prediction can be understood in three aspects:(1) the heterogeneity of rock is the main reason for the existence of rockburst precursors;(2) deformation localization is the intrinsic cause of rockburst;and(3) the interaction between target rock mass and its surrounding rock mass is the external cause of rockburst.As an engineering practice,the application of microseismic monitoring techniques during tunnel construction of Jinping II Hydropower Station was reported.It is found that precursory microcracking exists prior to most rockbursts,which could be captured by the microseismic monitoring system.The stress concentration is evident near structural discontinuities(such as faults or joints),which shall be the focus of rockburst monitoring.It is concluded that,by integrating the microseismic monitoring and the rock failure process simulation,the feasibility of rockburst prediction is expected to be enhanced. | Chun'an Tang Jimin Wang Jingjian Zhang | 2010 | Journal of Rock Mechanics and Geotechnical Engineering2010，2，3： | 32 |
| 2 | Applications of rock failure process analysis (RFPA) method显示文摘Brittle failure of rocks is a classical rock mechanical problem.Rock failure not only involves initiation and propagation of single crack,but also is associated with initiation,propagation and coalescence of many cracks.The rock failure process analysis(RFPA)tool has been proposed since 1995.The heterogeneity of rocks at a mesoscopic level is considered by assuming that the material properties follow the Weibull distribution.Elastic damage mechanics is used for describing the constitutive law of the meso-level element.The finite element method(FEM)is employed as the basic stress analysis tool.The maximum tensile strain criterion and the Mohr-Coulomb criterion are utilized as the damage threshold.In order to solve the stability problem related to rock engineering structures,fundamental principles of strength reduction method(SRM)and gravity increase method(GIM)are integrated into the RFPA.And the acoustic emission(AE)event rate is employed as the criterion for rock engineering failure.The prominent feature of the RFPA-SRM and RFPA-GIM for stability analysis of rock engineering is that the factor of safety can be obtained without any presumption for the shape and location of the failure surface.In this paper,several geotechnical engineering applications that use the RFPA method to analyze their stability are presented to provide some references for relevant researches.The principles of the RFPA method in engineering are introduced firstly,and then the stability analysis of tunnel,slope and dam is focused on.The results indicate that the RFPA method is capable of capturing the mechanism of rock engineering stability and has the potential for application in a larger range of geo-engineering. | Chun'an Tang Shibin Tang | 2011 | Journal of Rock Mechanics and Geotechnical Engineering2011，3，4： | 14 |
| 3 | Microseismic monitoring and numerical simulation on the stability of high-steep rock slopes in hydropower engineering显示文摘For high-steep slopes in hydropower engineering, damage can be induced or accumulated due to a series of human or natural activities, including excavation, dam construction, earthquake, rainstorm, rapid rise or drop of water level in the service lifetime of slopes. According to the concept that the progressive damage(microseismicity) of rock slope is the essence of the precursor of slope instability, a microseismic monitoring system for high-steep rock slopes is established. Positioning accuracy of the monitoring system is tested by fixed-position blasting method. Based on waveform and cluster analyses of microseismic events recorded during test, the tempo-spatial distribution of microseismic events is analyzed.The deformation zone in the deep rock masses induced by the microseismic events is preliminarily delimited. Based on the physical information measured by in situ microseismic monitoring, an evaluation method for the dynamic stability of rock slopes is proposed and preliminarily implemented by combining microseismic monitoring and numerical modeling. Based on the rock mass damage model obtained by back analysis of microseismic information, the rock mass elements within the microseismic damage zone are automatically searched by finite element program. Then the stiffness and strength reductions are performed on these damaged elements accordingly. Attempts are made to establish the correlation between microseismic event, strength deterioration and slope dynamic instability, so as to quantitatively evaluate the dynamic stability of slope. The case studies about two practical slopes indicate that the proposed method can reflect the factor of safety of rock slope more objectively. Numerical analysis can help to understand the characteristics and modes of the monitored microseismic events in rock slopes. Microseismic monitoring data and simulation results can be used to mutually modify the sensitive rock parameters and calibrate the model. Combination of microseismic monitoring and numerical simulation provides a more objective basis for the numerical model and parameters and a solid mechanical foundation for the microseismic monitoring. | Chun’an Tang Lianchong Li Nuwen Xu Ke Ma | 2015 | Journal of Rock Mechanics and Geotechnical Engineering2015，7，5： | 4 |
| 4 | FRACTURAL PROCESS AND TOUGHENING MECHANISM OF LAMINATED CERAMIC COMPOSITES显示文摘基于多层的横梁的模型和假设材料微不同类,把压成薄片的陶器的 composites 的 3D fractural 特征与数字模拟被学习了。在三点的弯曲负担下面,击碎开始,结合,繁殖,调节离开在弱接口和期末考试,破裂被模仿了。声学的排放的空间分发和进化过程也在纸被介绍。模拟验证导致裂缝在那里膨胀并且吸收 fractural 精力的弱接口的主要机制。因此,力量的效果和坚韧上的材料的性质的纪律意义在这篇论文被讨论。 | Zhang Yafang Tang Chun'an Zhang Yongbin Liang Zhenzao | 2007 | Acta Mechanica Solida Sinica2007，20，2： | 3 |
| 5 | Multi-Crack Coalesence in Rock-Like Material under Uniaxial and Biaxial Loading显示文摘 | Lin P. Wong R.H.C. Chau K.T. Tang Chun An | 2000 | 2000 (183)2000，，183： | 2 |
| 6 | Influence of Polluted SY River on Child Growth and Sex Hormones显示文摘Objective To investigate the influence of the polluted SY River on children's growth and sex hormones,and provide scientific data for assessment of the polluted status of the SY River.Methods The study areas were selected randomly from the SY River Basin.Lead (Pb),mercury (Hg),arsenic (As),phthalates (DEP,DBP,DMP,DEHP),and bisphenol A (BPA) were measured both in the river water and in the drinking water.School children were selected by cluster sampling (n=154).Physical development indexes (height,weight,bust-circumference,and skinfold thickness) and sex hormones [testosterone (T) and estradiol (E2)] were measured for all the children.Results The contents of Pb and Hg exceeded Class V standards of surface water quality in each section of the river and other indicators exceeded Class III.Compared to the control area,the concentrations of Pb,Hg,As,BPA,DEP,and DBP in the drinking water were significantly higher than in the polluted area (P<0.05).Children from the control area had significantly lower E2 and T than children from the polluted area (P<0.05).Among anthropometric results,only skinfold thickness had statistically significant difference between the two groups (P<0.05),while the other indexes showed no significant differences between the two groups (P>0.05).Conclusion The drinking water has been polluted by the SY River and affected serum sex hormone levels of children living in the polluted area. | TANG Chun Yu LI An Qi GUAN Yong Bo LI Yan CHENG Xue Min LI Ping LI Shi Qun LUO Yi Xin HUANG Qi CHEN Hong Yang CUI Liu Xin | 2012 | Biomedical and Environmental Sciences2012，25，3： | 2 |
| 7 | Fracture spacing behavior in layered rocks subjected to different driving forces: a numerical study based on fracture infilling process显示文摘受到层平行扩展的自然分层的岩石典型地与显著地常规的间距开发一连串的洞模式的破裂。这间距经常与层厚度可伸缩,并且当扩展增加,它减少直到破裂浸透被到达。增加这些洞模式的破裂怎么在分层的岩石中形成的理解,一系列 2D 数字模拟被执行调查受到不同驱动力的破裂的 infilling 过程。数字结果说明下列之一能在 infilling 破裂的繁殖后面被看作一个驱动力的那个任何东西:热效果,内部液体压力,装载的直接延期,或纯压缩装载。破裂间距开始与装载过程减少,并且在到层厚度的破裂间距的某个比率,没有新破裂起核心作用(浸透) 。两个都, infilled 破裂和接口分层的开始的增加作为机制被观察提供另外的紧张。接口 debonding 制止应力的转变附近的层到嵌入的中央层,它可以进一步预防新破裂的 infilling。驱动力是无论什么,一大压垂应力和一块大橡皮在生硬、软的层之间形成对照(叫作中央或断裂的层和底部层) 是在模型在 infilled 破裂附近赞成张力的应力的发展的关键因素。破裂间距被期望与增加减少压垂应力。断裂的过程在在压力分发和导致失败的压力再分配上提供增补信息的异构、分层的沉积岩石中开发了的数字结果热点,详细,它也显示出破裂地区和破裂的相互作用的繁殖,它是不可能的在地里观察并且是困难的与静态的应力认为分析来临。 | Lianchong LI Shaohua LI Chun'an TANG | 2014 | Frontiers of Earth Science2014，8，4： | 2 |
| 8 | Numerical Simulations of Failure of Brittle Solids under Dynamic Impact Using a New Computer Program - DIFAR显示文摘 | Chau K.T. Zhu Wan Cheng Tang Chun An Wu S.Z | 2004 | 2004 (261)2004，，261： | 2 |
| 9 | Kinetic Characteristics of Neutralizing Antibody Responses Vary among Patients with COVID-19显示文摘Objective The coronavirus disease 2019(COVID-19) pandemic continues to present a major challenge to public health. Vaccine development requires an understanding of the kinetics of neutralizing antibody(NAb) responses to severe acute respiratory syndrome coronavirus 2(SARS-CoV-2).Methods In total, 605 serum samples from 125 COVID-19 patients(from January 1 to March 14, 2020)varying in age, sex, severity of symptoms, and presence of underlying diseases were collected, and antibody titers were measured using a micro-neutralization assay with wild-type SARS-CoV-2.Results NAbs were detectable approximately 10 days post-onset(dpo) of symptoms and peaked at approximately 20 dpo. The NAb levels were slightly higher in young males and severe cases, while no significant difference was observed for the other classifications. In follow-up cases, the NAb titer had increased or stabilized in 18 cases, whereas it had decreased in 26 cases, and in one case NAbs were undetectable at the end of our observation. Although a decreasing trend in NAb titer was observed in many cases, the NAb level was generally still protective.Conclusion We demonstrated that NAb levels vary among all categories of COVID-19 patients. Longterm studies are needed to determine the longevity and protective efficiency of NAbs induced by SARS-CoV-2. | LI Ling Hua TU Hong Wei LIANG Dan WEN Chun Yan LI An An LIN Wei Yin HU Ke Qi HONG Wen Shan LI Yue Ping SU Juan ZHAO San Tao LI Wei YUAN Run Yu ZHOU Ping Ping HU Feng Yu TANG Xiao Ping KE Chang Wen KE Bi Xia CAI Wei Ping | 2021 | Biomedical and Environmental Sciences2021，34，12： | 1 |
| 10 | Numerical simulation of crack development in reinforced concrete structures under eccentric loading 显示文摘 | Zhang Juanxia Liu Junjie Tang Chun'an | 2005 | Key Engineering Materials2005，，： | 1 |
| 11 | Silylated and acetylated β-cyclodextrins for gas chromatographic stationary phases显示文摘Two new chiral stationary phases, 2,3 di O acetyl 6 O trimethylsilyl β cyclodextrin (DATBCD) and 2,6 di O trimethylsilyl 3 O acetyl β cyclodextrin(DTABCD), were synthesized, their structures were identified by means of infrared and NMR spectra. Capillary columns were coated with the two stationary phases by dynamic method. The chromatographic properties, and enantiomers separation, such as ketone, esters, alcohols and olefines, were investigated on the silylated and acetylated β cyclodextrin stationary phases. The experimental results show that the silylated and acetylated β cyclodextrins are suitable to be used as capillary gas chromatographic stationary phases, the relative polarity of DATBCD and DTABCD stationary phases is respectively 4143 and 3928, the column efficiencies are respectively 3084 and 4198, and DATBCD is of stronger enantioselectivity than DTABCD, capacity factor of the first eluted enantiomer ( k 1) and separation factor(α)of α phenylethanol on DATBCD stationary phase are respectively 8.23 and 1.019. | TANG Ke wen 1,2 ,YI Jian ming 2,ZHOU Chun shan 1,ZHONG Shi an 1 (1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China 2. College of Chemistry and Chemical Engineering, Yueyang Normal University | 2001 | Journal of Central South University of Technology2001，8，4： | 1 |
| 12 | Multi-Crack Coalesence in Rock-Like Material under Uniaxial and Biaxial Loading显示文摘 | Lin P. Wong R.H.C. Chau K.T. Tang Chun An | 2000 | Key Engineering Materials2000，，183： | 1 |
| 13 | Mechanism of stepwise tectonic control on gas occurrence: A study in North China显示文摘To gain an understanding of gas occurrence, distribution is the fundamental basis for preventing gas disasters. Presently, how tectonic structures control gas occurrence remains problematic. This study proposes the theory and elucidates the mechanism of stepwise tectonic control on gas occurrence according to the characteristics of gas occurrence and the patterns of gas distribution in coal mines in North China. On the one hand, tectonic compression and shearing lead to stress concentration and thus deform the coal and reduce the coal seam permeability, further contributing to gas preservation. On the other hand, tectonic extension and rifting lead to stress release and thus improve the coal seam permeability, further contributing to gas emission. Therefore, the distribution zones of tectonic compression, ubiquitous coal deformation, and gas accumulation have been step-wisely revealed, and the coal-gas outburst proneness zones are finally identified. The proposed theory of step-wise tectonic control on gas occurrence is of practical significance for gas prediction and control. | Jia Tianrang Zhang Zimin Wei Guoying Tang Chun'an | 2015 | International Journal of Mining Science and Technology2015，25，4： | 1 |
| 14 | Ubiquitin is double-phosphorylated by PINK1 for enhanced pH-sensitivity of conformational switch显示文摘Dear Editor,Multisite phosphorylation is observed in many signaling proteins,which confers the proteins new functions.A multisite phosphorylated protein can exhibit switch-like response to cellular stimuli,with the often-clustered phosphorylation sites either unphosphorylated or fully phosphorylated by the same kinase(Kapuy et al..2009).Multisite phosphorylation has also been reported to promote the folding of an intrinsically disordered protein,and consequently modulate the binding affinity to other proteins(Bah et al.,2015).Here we show that multisite phosphorylation makes a protein a better pH sensor,promptly switching between alternative conformational states in response to pH change under physiological conditions. | Shang-XiangYe Zhou Gong Ju Yang Yu-Xin An Zhu Liu Qun Zhao Ewen Lescop Xu Dong Chun Tang | 2019 | Protein & Cell2019，10，12： | 1 |
| 15 | Numerical Simulation of Crack Development in Reinforced Concrete Structures under Eccentric Loading显示文摘 | Liu Junjie Tang Chun an | 2005 | Key Engineering Ma-terials2005，，： | 1 |
| 16 | Microscale crack propagation in shale samples using focused ion beam scanning electron microscopy and three-dimensional numerical modeling显示文摘Reliable prediction of the shale fracturing process is a challenging problem in exploiting deep shale oil and gas resources.Complex fracture networks need to be artificially created to employ deep shale oil and gas reserves.Randomly distributed minerals and heterogeneities in shales significantly affect mechanical properties and fracturing behaviors in oil and gas exploitation.Describing the actual microstructure and associated heterogeneities in shales constitutes a significant challenge.The RFPA3D(rock failure process analysis parallel computing program)-based modeling approach is a promising numerical technique due to its unique capability to simulate the fracturing behavior of rocks.To improve traditional numerical technology and study crack propagation in shale on the microscopic scale,a combination of high-precision internal structure detection technology with the RFPA^(3D) numerical simulation method was developed to construct a real mineral structure-based modeling method.First,an improved digital image processing technique was developed to incorporate actual shale microstructures(focused ion beam scanning electron microscopy was used to capture shale microstructure images that reflect the distri-butions of different minerals)into the numerical model.Second,the effect of mineral inhomogeneity was considered by integrating the mineral statistical model obtained from the mineral nanoindentation experiments into the numerical model.By simulating a shale numerical model in which pyrite particles are wrapped by organic matter,the effects of shale microstructure and applied stress state on microcrack behavior and mechanical properties were investigated and analyzed.In this study,the effect of pyrite particles on fracture propagation was systematically analyzed and summarized for the first time.The results indicate that the distribution of minerals and initial defects dominated the fracture evolution and the failure mode.Cracks are generally initiated and propagated along the boundaries of hard mineral particles such as pyrite or in soft minerals such as organic matter.Locations with collections of hard minerals are more likely to produce complex fractures.This study provides a valuable method for un-derstanding the microfracture behavior of shales. | Xin Liu Si-Wei Meng Zheng-Zhao Liang Chun'an Tang Jia-Ping Tao Ji-Zhou Tang | 2023 | Petroleum Science2023，20，3： | 1 |
| 17 | Numerical Simulations of Failure of Brittle Solids under Dynamic Impact Using a New Computer Program - DIFAR显示文摘 | Chau K.T. Zhu Wan Cheng Tang Chun An Wu S.Z | 2004 | Key Engineering Materials . 2004 (261)2004，，261： | 1 |
| 18 | New metal-free one-pot synthesis of substituted allenes from enones显示文摘 | Tang Meng Fan Chun'an Zhang Furnin | 2008 | Org Lett2008，10，24： | 1 |
| 19 | Numerical simulation of crack development in reinforced concrete structures under eccentric loading显示文摘 | Zhang Juanxia Liu Junjie Tang Chun'an | 2005 | Key Engineering Materials2005，297，： | 1 |
| 20 | Three-Dimensional Material Failure Process Analysis显示文摘 | Tang Chun An Liang Zheng Zhao Zhang Yong Bin Xu Tao | 2005 | Key Engineering Materials2005，，297： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员