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检索条件"任意字段=Rock Characterisation,Modelling and Engineering Design Methods——The 3rd ISRM SINOROCK Symposium"

共 307 条记录，以下是221-230 订阅

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Intelligent loop recognition of rock parameter for large underground hydraulic cavern

引用

rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Q.Jiang J.Cui X.T.Feng D.F.Chen X.J.Hao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences

ISBN: (纸本)9781138000575

During the construction of large underground caverns under complicated geological conditions, reasonable mechanical parameters are the key to evaluating the mechanical safety and the behaviors of rock cavern. The method of intelligent loop recognition(ILR) is proposed for identifying mechanical rock parameters for large hydropower underground *** the 3D spatial opening characteristics of large underground cavern,this method identifies equivalent mechanical parameters using multi-monitoring data and an intelligent algorithm at phase i opening of ***,the reliability of these identified parameters are validated at phase i + 1 opening of *** equivalent mechanical parameters are achieved after several excavation phases of cavern by circularly *** in the caverns of Jinping II underground hydropower station indicates that the proposed method is credible,and the identified mechanical parameters are both reliable and *** paper also proves firstly that the parameter of engineering rock is stable and can be acquired.

关键词： Intelligent loop recognition of rock parameter for large underground hydraulic cavern

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Estimation of the performance of chain saw machines from shore hardness and the other mechanical properties

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： D.Tumac E.Avunduk H.Copur N.Bilgin C.Balci Mining Engineering Department Istanbul Technical UniversityMaslakIstanbulTurkey

ISBN: (纸本)9781138000575;1138000574

One of the most important factors affecting the production rates in quarry mining is the performance of chain saw and diamond wire saw cutting *** this study,Shore hardness,Schmidt hammer and uniaxial compressive strength values are used to predict the field performance of chain saw *** stone quarries are visited in Turkey in order to measure the field performance of chain saw *** natural stone samples are obtained from different quarries for defining the physical and mechanical properties and Schmidt hammer and Shore scleroscope hardness *** single parameter statistical relationships between Schmidt hammer hardness,Shore scleroscope hardness,mechanical properties and the field performance of chain saw machines are *** indicate that there are strong relationships between field performance of chain saw machines and Schmidt hammer values,Shore hardness values,mechanical properties of natural stones.

关键词： net Estimation of the performance of chain saw machines from shore hardness and the other mechanical properties

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An innovative approach for recognizing deformation patterns of a built circular tunnel

引用

rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Ya-Chu Chiu Tai-Tien Wang Tsan-Hwei Huang National Taiwan University National Taipei University of Technology

ISBN: (纸本)9781138000575

This manuscript established an innovative approach for recognizing deformation patterns of a built tunnel,which benefits for diagnosing possible causes for lining *** with a circular tunnel,the deformation of a tunnel lining is first assumed to be composition of specific deformation patterns. These patterns are numerically approved as linearly independent to each other with sufficient degrees of freedom, and are thus regarded as characteristic modes which can assemble all deformation situations by multiplying various *** simple examples with load variation on boundaries are introduced to demonstrate the proposed *** displacements in each example are decomposed as linear combination of characteristic *** illustrations indicate these deformation patterns posing different physical meaning including translation,rotation,and several types of deformation for tunnel lining.

关键词： An innovative approach for recognizing deformation patterns of a built circular tunnel

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Frequency fractal feature of microseismic events in the process of immediate rockburst in deep tunnel

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Y.X.Xiao X.T.Feng Y.Yu B.R.Chen G.L.Feng State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences School of Resource and Civil Engineering Northeastern University

ISBN: (纸本)9781138000575

In order to research microseismic(MS) activity rules in the process of rockburst in deep tunnel, the immediate rockburst induced by TBM and D&B excavation are measured in the *** attention law of microseismic waveform shows that frequency is a better parameter to reflect the real feature of microseismic ***,a calculated method of the main frequency of MS event and its fractal dimension is *** study on the evolution of fractal dimension of the main frequency in the process of immediate rockbursts shows that the distribution of main frequency of MS events is a fractal and has statistical *** rockburst induced by different excavation method has different *** lowest fractal dimension of main frequency occurred on the day before major rockburst in the TBM *** in the D&B tunnel,the fractal dimension gets lowest on the right day of major *** results can provide references for warning and mechanism study of rockburst in deep tunnel.

关键词： Frequency fractal feature of microseismic events in the process of immediate rockburst in deep tunnel

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Stability analysis for toppling failure of unstable rock in Three Gorges reservoir area,China

引用

rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： G.L.Wang F.Q.Wu W.J.Ye Xi'an Center of Geological Survey China Geological Survey Institute of Geology and Geophysics Chinese Academy of Sciences Xi'an University of Science and Technology

ISBN: (纸本)9781138000575;1138000574

As distinguished from the former types of toppling failure(***,blocky,- blocky-flexural and secondary),another type of toppling failure developed in interbedded hard rock and soft rock slope is very common in Three Gorges Reservoir *** on discrete element method,the failure process of toppling failure can be summarized as erosion notches→tension cracks→toppling failure→gravitational transport and *** to the toppling failure mode,the computing formula of factor of safety is deduced by means of the method of *** results of a typical case study show that the factor of safety of toppling failure decreases with increasing of notch *** the erosion rate of notches is 1 mm/yr and toppling failure of the unstable rock occurs at a notch depth of 1.45 m,we can calculate the time required for the unstable rock to topple as 50 years.

关键词： Stability analysis for toppling failure of unstable rock in Three Gorges reservoir area,China

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Finite element analysis of geotechnical behavior of an underground oil storage facility in granite

引用

rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Z.Wang S.Li L.Qiao Shandong University Jinan

ISBN: (纸本)9781138000575

The geotechnical performance of a pilot unlined crude oil storage caverns in granite is assessed using finite element *** and field tests were performed to determine the geotechnical properties of the *** simulations were carried out to assess the groundwater dropdown and stability of the caverns according to the test results.5 numerical cases with different permeability coefficients were performed to investigate the influence of permeability *** simulation results indicated that the operation period of the storage caverns will be less than the designed period if there is no groundwater supply *** was also found that there is an approximately linear relation between groundwater inflow flux and permeability in the double logarithm *** the stability of the caverns,it is shown that the stability of pillars between different caverns is different as a result of the different stress paths experienced of the pillars.

关键词： Finite element analysis of geotechnical behavior of an underground oil storage facility in granite

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Numerical identification of roll compression induced disintegration modes of a coal prism within roller mill

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Y.D.Zhou Y.L.Liu X.W.Tang State Key Laboratory of Hydroscience and Engineering Tsinghua University State Key Laboratory of Subtropical Building Science School of Civil Engineering and TransportationSouth China University of Technology

ISBN: (纸本)9781138000575;1138000574

This paper presents a pilot numerical study into the rolling compression induced disintegration modes of a coal prism within a mill of vertical roller *** simulate the breakage process characterized by large deformation and the transition from continuum to discontinuum,the coal prism was modeled with the smoothed particle hydrodynamics(SPH) method,and the mill structure was modeled by the finite element method(FEM) *** interaction between the coal specimen and the roller was considered by introducing a master-slave contact *** main aims of this study are to investigate the effects of specimen size and slenderness ratio on the disintegration modes of coal *** was found through parametric analyses that the disintegration modes of the coal prisms would be significantly affected by the variations in specimen geometry.

关键词： Numerical identification of roll compression induced disintegration modes of a coal prism within roller mill

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New technology for the slope seismic design-the embedded anti-slide pile

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Jiangbo Xu Faquan Wu Yingren Zheng Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences Department of Civil Engineering Logistical Engineering University Chongqing Engineering and Technology Research Center of Geological Hazards Control

ISBN: (纸本)9781138000575

In recent years,embedded anti-slide pile was applied widely in the slope protection,and it becomes the major method in this *** far,the research was well developed under the static situation,but the dynamic *** this article,according to the dynamic strength reduction method and utilization of finite difference soft ware(FLAC),a new embedded anti-slide pile anti-seismic design method was put up. Comparing the internal force value of pile before and after earthquake effects,the bigger value was adopted to be the value which is designed internal anti-seismic value,as well as the internal force distribution of the pile was *** the calculation and analysis of the particular slope,the result shows that:the embedded anti-slide pile not only can protect the slope under the static situation,but also can satisfy the requirements of the anti-seismic design.

关键词： New technology for the slope seismic design-the embedded anti-slide pile

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Simulation of rock crack propagation using continuous-discontinuous cellular automaton method

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： Fei Yan Xia-Ting Feng Peng-Zhi Pan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Science

ISBN: (纸本)9781138000575

An approach of continuous-discontinuous cellular automaton method for modeling rock crack propagation is developed,in which level set method,discontinuous enriched shape function,discontinuous cellular automaton and contact friction theory are ***,level set method is employed to track the location of the cracks,which are independent with the ***,contact friction theory is applied to construct the contact friction model,and frictional stresses between crack surfaces can be exactly described. Thirdly,discontinuous cellular automaton is constructed,and the whole calculations are located on cells,so no assembled stiffness matrix but only cell stiffness is ***,contact iterations are done simultaneously with the updating of cellular automaton,and a new mixed iteration method is proposed,in which contact states and areas can be previously obtained,and the efficiency can get much ***,numerical results are given to illustrate the efficiency of the present method.

关键词： Simulation of rock crack propagation using continuous-discontinuous cellular automaton method DCA

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Coupling relation between damage-induced permeability evolution and accelerated creep deformation of volcanic breccias

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rock characterisation,modelling and engineering design methods——the 3rd isrm sinorock symposium

作者： R.B.Wang W.Y.Xu Research Institute of Geotechnical Engineering Hohai University Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University

ISBN: (纸本)9781138000575;1138000574

Following the previous work about the relation between permeability evolution and rock creep deformation[1-2],triaxial creep tests of volcanic breccias under various seepage pressures were performed on rock specimens and their lateral deformation behavior in the accelerated creep phase volcanic breccias were also *** damage variable and related evolution equation in accelerated creep were proposed. Based on the relation of damage variable associated with lateral creep strain,the correlativity between axial permeability coefficient and lateral damage-induced strain under different confining pressures was analyzed, and then the relation equation of permeability coefficient as a function of damage-induced strain during the process of accelerated creep was *** assumption was made that the axial permeability coefficient has close relationship not only with lateral creep strain,but also with creep damage-induced crack *** equation can be applied for for numerical analysis of coupling seepage and stress during the process of rock creep damage.

关键词： rock mechanics creep properties volcanic breccias triaxial creep test permeability evolution creep damage

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