检索结果-南通市图书馆

Influence of joint spacing and rock characteristics on the toppling stability of cut rock slope through a simplified limit equilibrium method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第8期31卷 2694-2702页

作者： ZHANG Xue-peng JIANG Yu-jing DU Yan WANG Ke-peng CAI Yue WANG Xing-da SU Hang GOLSANAMI Naser LIU Bao-guo State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and TechnologyQingdao 266590China College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China School of Engineering Nagasaki University1-14 Bunkyo-machi8528521 NagasakiJapan Beijing Key Laboratory of Urban Underground Space Engineering University of Science and Technology BeijingBeijing 100083China The 4th Engineering Company China Railway No.3 Engineering Group Co.Ltd.Beijing 102300 Fukumichi Limited Liability Company Fukuoka 813-0041Japan College of Electrical Engineering and Automation Shandong University of Science and TechnologyQingdao 266590China School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

Toppling failure of rock mass/soil slope is an important geological and environmental *** its failure mechanism under different conditions has great significance in *** toppling failure of a cutting slope occurred in a hydropower station in Kyushu,Japan illustrates that the joint characteristic played a significant role in the occurrence of rock slope tipping ***,in order to consider the mechanical properties of jointed rock mass and the influence of geometric conditions,a simplified analytical approach based on the limit equilibrium method for modeling the flexural toppling of cut rock slopes is proposed to consider the influence of the mechanical properties and geometry condition of jointed rock *** theoretical solution is compared with the numerical solution taking Kyushu Hydropower Station in Japan as one case,and it is found that the theoretical solution obtained by the simplified analysis method is consistent with the numerical analytical solution,thus verifying the accuracy of the simplified ***,the Goodman-Bray approach conventionally used in engineering practice is improved according to the analytical *** results show that the allowable slope angle may be obtained by the improved Goodman-Bray approach considering the joint spacing,the joint frictional angle and the tensile strength of rock mass together.

关键词： slope stability flexural toppling rock slope simplified limit equilibrium method

rock slope stability evaluation using kinematic and kinetic methods along the Kamyaran-Marivan road,west of Iran

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2021年第3期18卷 779-793页

作者： Mohsen SHARIATI Davood FEREIDOONI School of Earth Sciences Damghan UniversityDamghan 9823Iran

Interest in rock slope stability in mountainous regions has increased greatly in recent *** issue has become a topic of major interest for geoscientists and engineering professionals,as well as for private citizens and local administrators,in many parts of the *** paper evaluates the stability of seven rock slopes along the KamyaranMarivan tourist road,Kurdistan province,Iran,using various *** two main reasons for performing this research were to determine whether different methods of stability analysis provide the same results,and to determine how different factors such as the presence of water,tension cracks,and seismic forces affect the stability of these rock ***,field investigations were performed to obtain the engineering characteristics of the rock masses,discontinuities,and intact rocks of the ***,laboratory tests were carried out on rock samples obtained from the slopes,to determine the engineering properties of the intact *** for each rock slope,the contour diagram of discontinuities and slope face was drawn in the Dips v.5.1 software environment,and the failure mechanism was determined based on the kinematic or stereographic ***,the factors of safety of the rock slopes were calculated using the limit equilibrium method,based on the failure mechanisms resulting from the kinematic *** accuracy of the results obtained by these two methods was investigated using SWedge v.4.0 *** results indicated that four rock slopes have a potential for plane,wedge,and toppling failure,and three others are ***,it was found that the stability of the studied rock slopes decreases greatly in the presence of water,tension cracks,and seismic forces.

关键词： Kamyaran-Marivan Road rock slope rock mass Discontinuity Stability analysis

Failure precursor of surrounding rock mass around cross tunnel in high-steep rock slope

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2013年第1期20卷 207-217页

作者：马克唐春安徐奴文刘峰徐敬武 Institute of rock Instability and Seismicity Research Faculty of Infrastruction EngineeringDalian University of Technology State Key Laboratory of Coastal and Offshore Engineering (Dalian University of Technology) State Key Laboratory of Hydraulics and mountain River Engineering (College of Water Resources and Hydropower Sichuan University) HydroChina Chengdu Engineering Corporation China Guodian Dadu River Dagangshan Hydropower Development Co. Ltd.

The stability of the surrounding rock mass around cross tunnel in the right bank slope of Dagangshan hydropower station, in the southwestern China, was analyzed by microseismic monitoring as well as numerical simulations. The realistic failure process analysis code （abbreviated as RFPA3D） was employed to reproduce the initiation, propagation, coalescence and interactions of micro-fractures, the evolution of associated stress fields and acoustic emission （AE） activities during the whole failure processes of the surrounding rock mass around cross tunnel. Combined with microseismic activities by microseismic monitoring on the fight bank slope, the spatial-temporal evolution and the micro-fracture precursor characteristics during the complete process of progressive failure of the surrounding rock mass around cross tunnel were discussed and the energy release law of the surrounding rock mass around the cross tunnel was obtained. The result shows that the precursor characteristic of microfractures occurring in rock mass is an effective approach to early warn catastrophic damage of rock mass around cross tunnel. Moreover, the heterogeneity of rock mass is the source and internal cause of the failure precursor of rock mass.

关键词： rock slope cross tunnel microseismic monitoring precursory characteristics heterogeneity

Discussion on blasting vibration monitoring for rock damage control in rock slope excavation

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2022年第1期21卷 53-65页

作者： Yang Jianhua Cai Jiyong Yao Chi Zhang Xiaobo Liu Liansheng School of Civil Engineering and Architecture Nanchang UniversityNanchang 30031China School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Drill and blast is a commonly used method for rock slope excavation in hydropower *** blasting excavation of rock slopes,far-field vibration monitoring on the first upper berm for statutory compliance is usually performed to control the blast-induced rock damage to the final slope *** this study,for the rock slope excavation in the Jinping-I hydropower station,the field vibration monitoring and acoustic testing are presented to investigate the vibration characteristics on the first upper berm and the damage depth in the current *** relationship between the PPV on the first upper berm and the PPV damage threshold on the damage zone boundary is also studied through three-dimensional FEM *** results show that on the first upper berm,the maximum vibration velocity component occurs in the vertical *** on the blasting damage zone boundary,the horizontal radial vibration velocity is the maximum *** the Jinping-I slope with a bench height of 30 m,the radial PPV on the inner side of the first upper berm is 2.06%of the PPV threshold on the damage zone *** ratio is increased as the bench height ***,the bench height of the rock slope is an important factor that cannot be ignored in determining the allowable vibration velocity for rock damage control.

关键词： rock slope blasting excavation vibration rock damage

Dynamic Stability Analysis of Wedge in rock slope Based on Kinetic Vector Method

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2014年第4期25卷 749-756页

作者： Weida Ni Huiming Tang Xiao Liu Rui Yong Zongxing Zou Faculty of Engineering China University of Geosciences Three Gorges Research Center for Geo-hazard Ministry of Education China University of Geosciences

A new method （kinetic vector method, KVM） is presented for analyzing the dynamic stability of wedge in rock slope. The dynamic analysis is carried out based on three dimensional distinct element code （3DEC）, and the kinetic inertial force of the wedge under seismic loading can be obtained via calculating the net vectorial nodal force of the finite difference grid. Then, the factor of safety （FOS） of the wedge can be calculated based on limit equilibrium method （LEM） at each dynamic analysis step, therefore time series of the FOS for whole earthquake process can be obtained. For the purpose of evaluating the entire dynamic stability of the wedge, dynamic factor of safety （DFOS） is proposed and defined as a numerical value corresponding with a given rate of probability guarantee based on reliability theory. Consequently, the KVM inherits the merits of the LEM and also has fully nonlinear dynamic analysis capabilities, and the feasibility and correctness of the KVM are tested by an example given by Hoek and Bray （1981）. Finally, a rock slope case in Wenchuan Earthquake regions of China is presented to verify the engineering practicability of the KVM, and the results matched the actual situation well.

关键词： dynamic stability limit equilibrium discrete element kinetic vector method rock slope Wenchuan Earthquake.

Influence of blasting on the properties of weak intercalation of a layered rock slope

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 7-11页

作者： Xiao-lin Song Ji-chun Zhang Xue-bin Guo Zheng-xue Xiao School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Traction Power State Key Laboratory Southwest Jiaotong University Chengdu 610031 China School of Environmental Engineering Southwest University of Science and Technology Mianyang 621002 China

A precondition for correctly analyzing the stability of a slope and designing its bracing structure is to study and determine the influence of excavation blasting on the properties of weak intercalation in the layered rock slope. On the basis of in-situ stratification-cracking blasting tests, the properties of weak intercalation were investigated using the LS-DYNA3D program. The displacement distribution and compactness of weak intercalation at different positions away from the charge center and their various laws are discussed. The critical displacement of stratification-cracking （0.1 mm） was obtained, and an approximate expression of compactness were deduced. Furthermore, through the simulation of a layered rock blasting under the same geological conditions, the stratification-cracking effect of deep-hole blasting on the properties of weak intercalation was compared with that of short-hole blasting, and the influencing differences, in addition to their causes, were analyzed. The results indicated that the blasting cavity of weak intercalation in short-hole blasting with a radius of 40 mm was nearly a circle, whose radius was about 28.7 cm; whereas in deep-hole blasting with a radius of 150 mm, the shape of the blasting cavity was different from that in short-hole blasting, the radius of the cavity behind the charge （89.1 cm） was further smaller than those of the other three （138.7 cm）, and there were sharp crinkles on the surface of weak intercalation. When the distance from the charge center （DCC） was less than 40 and 150 cm in short-hole and deep-hole blasting, respectively, the displacement of weak intercalation was reduced remarkably with the increase in DCC.

关键词： rock slope bench blasting numerical simulation intercalation

3D Identification and Stability Analysis of Key Surface Blocks of rock slope

在线全文

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2016年第4期22卷 317-323页

作者：李明超周四宝王刚 State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Chengdu Engineering Corporation Limited Power China

Complicated geological structures make it difficult to analyze the stability of rock slopes, such as faults, weak intercalated layers or joint fissures. Based on 3D geological modeling and surface block identifying methods, an integrated methodology framework was proposed and realized to analyze the stability of surface blocks in rock slopes. The surface blocks cut by geological structures, fissures or free faces could be identified subjected to the four principles of closure, completeness, uniqueness and validity. The factor of safety(FOS)of single key block was calculated by the limit equilibrium method. If there were two or more connected blocks, they were defined as a block-group. The FOS of a block-group was computed by the Sarma method. The proposed approach was applied to an actual rock slope of a hydropower project, and some possible instable blocks were demonstrated and analyzed visually. The obtained results on the key blocks or block-groups provide essential information for determining potential instable region of rock slopes and designing effective support scheme in advance.

关键词： rock slope 3D model surface block block-group stability factor of safety(FOS)

Force analysis of pile foundation in rock slope based on upper-bound theorem of limit

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University of Technology 2008年第3期15卷 404-410页

作者：赵明华刘建华刘代全汪优 Geotechnical Institute Hunan University Hunan Expressway Administration Bureau

Based on the characteristic that the potential sliding surfaces of rock slope are commonly in the shape of either line or fold line,analysis thought of conventional pile foundation in the flat ground under complex load condition was applied and the upper-bound theorem of limit analysis was used to compute thrust of rock layers with all possible distribution shapes. The interaction of slope and pile was considered design load in terms of slope thrust,and the finite difference method was derived to calculate inner-force and displacement of bridge pile foundation in rock slope under complex load condition. The result of example shows that the distribution model of slope thrust has certain impact on displacement and inner-force of bridge pile foundation. The maximum displacement growth rate reaches 54% and the maximum moment and shear growth rates reach only 15% and 20%,respectively,but the trends of inner-force and displacement of bridge pile foundation are basically the same as those of the conventional pile foundation in the flat ground. When the piles bear the same level lateral thrust,the distribution shapes of slope thrust have different influence on inner-force of pile foundation,especially the rectangle distribution,and the triangle thrust has the smallest displacement and inner-force of pile foundation.

关键词： pile foundation rock slope inner-force calculation finite difference method upper-bound theorem of limit analysis

Evaluation method for expressway rock slope stability based on numerical simulation

在线全文

学校读者我要写书评

暂无评论

Journal of Coal Science & Engineering(China) 2004年第2期10卷 15-18页

作者：乔兰刘宝许 Civil and Environmental Engineering School University of Science and Technology(Beijing) Beijing 100083 China Civil and Environmental Engineering School University of Science and Technology(Beijing)Beijing 100083China

Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blast- ing process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting, and discusses of the blasting vibration influence to the rocky cut slope from many sides. the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and accel- eration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the ex- pressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.

关键词： rock slope stability FEM mountainous expressway