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

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Anisotropic deformation in Muzhailing railway tunnel,Gansu,China

引用

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

作者： Peng Sha Faquan Wu Qiliang Guo Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Science Institute of Crustal Dynamics Chinese Earthquake Administration

ISBN: (纸本)9781138000575

Muzhailing railway tunnel is excavated mainly in fault zones,carbonaceous slate and sandstone using the drilling-blasting *** problems encountered in the tunnel during construction,such as large squeezing deformation with long duration and collapse of arch *** monitoring data shows the ratio between the maximum cumulative horizontal and vertical displacements reaches to 4 to 10,which shows an anisotropic ***,serial hydraulic fracture stress tests we conducted in tunnel indicate that coefficient of lateral pressure k approaches to 3,compared to the ratio of in-situ stress which is about *** geological analysis and the numerical simulation show that the special rock mass with layered structure presents an appearance of heterogeneous condition which affects the redistribution of stress in tunnel and takes major responsibility for the large horizontal deformation of *** addition,blasting excavation and groundwater also caused some problems during the excavation of the tunnel.

关键词： Tunneling engineering Large deformation Layered structure Special rock mass

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Modeling of rockfalls using the lumped mass method and DDA

引用

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

作者： Cheng-Yu Ku Department of Harbor and River Engineering National Taiwan Ocean UniversityKeelung

ISBN: (纸本)9781138000575;1138000574

This paper presents the modeling of rockfalls using the lumped mass method and the DDA *** the lumped mass method,the block is treated as a lumped mass which neglects the three-dimensional aspects of the block such as the block shape and the subsequent block orientation at the instant of impact on the *** the contrary,the DDA method for rigid blocks,which is a two-dimensional deterministic discrete element analysis,is adopted to study the rockfall problem if it is of importance to investigate the effects from the shape and size effects of the falling *** obtained demonstrate that the proposed method with the combination of using the lumped mass method and the DDA method can greatly increase the reliability of predicting rockfall trajectories using the high resolution DEM and exhibit great potential for practical applications in the future.

关键词： Carlo simulation Modeling of rockfalls using the lumped mass method and DDA

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A new method to determine shearing strength for limestone—a case study on Longshan Quarry of Anning City in Yunnan

引用

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

作者： Shiguang Xu Jianguo Wang Chenchen Li Kunming University of Science and Technology China Yunnan Geologic and Mineral Bureau of Exploration & Exploitation Kunming University of Science and Technology

ISBN: (纸本)9781138000575

Thirty six slopes,which are constituted by limestone,in Longshan Quarry of Anning City have been studied in order to get a new method to determine the shearing strength for *** comparison the parameter error between the site shearing test and the calculated value that is based on the slope stability,the later has been employed as the substitute of the former to increase the specimen so as to reveal the relationship between the angle of shearing resistance of the rock and the Assuring assembly on the slope together with the coefficient of rock *** the regression analysis is employed,the basic regularity is turned out,which shows the angle of shearing resistance of the rock mass can be determined by the angle of shearing resistance of the rock experimented in laboratory through a discount with the coefficient of its rock integrity.

关键词： case studies rock joints rock mass classfication stability analysis.

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Slope stability of final highwall slope at West Bokaro Collieries,India

引用

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

作者： V.K.Singh Slope Stability Department Central Institute of Mining and Fuel Research(CIMFR)DhanbadJharkhandIndia

ISBN: (纸本)9781138000575

The paper deals with geotechnical study for the final slope of 140 m high final open pit mine slope at SE Block of West Bokaro Collieries,Tata *** is mainly characterized by sandstone and *** bulk density and direct shear tests were conducted at rock Mechanics Laboratory of CIMFR on the samples collected from the *** geotechnical mapping was done on the exposed benches of the quarry as per the norms of International Society of rock Mechanics(isrm 1978).The kinematic analysis was done to determine the critical orientation of structural *** identifying kinematically possible failure modes,detailed slope stability analysis was carried out by GALENA software based on limit equilibrium *** present study reveals that the 140 m high final slope could be designed with 47 degree overall slope *** sensitivity analysis shows that the influence of water is also *** was recommended that the slope should be kept in drained geomining condition by providing suitable drainage and keeping drainage effectively maintained.

关键词： Slope stability of final highwall slope at West Bokaro Collieries,India

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A geomechanical comparison between a naturally fractured rock mass and its DFN equivalent based on FEMDEM simulation

引用

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

作者： Q.Lei J.-P.Latham J.Xiang L.Guo Department of Earth Science and Engineering Imperial College LondonLondonUK

ISBN: (纸本)9781138000575

This paper presents a comparison between natural and stochastic fracture systems in terms of their geomechanical response to in-situ *** analogue fracture network(AFN) is extracted from the geological map of a limestone outcrop.A corresponding discrete fracture network(DFN) is generated using the statistics obtained from the analogue pattern,to ensure the two networks share the same statistical *** geomechanical response is modelled using the combined finite-discrete element method (FEMDEM).A series of numerical experiments is designed with far-field stresses applied at a range of angles to the rock domain.A comparison between the natural fracture system and its DFN equivalent is made based on phenomena such as fracture-dependent stress heterogeneity,re-activation of pre-existing fractures,new crack propagation and variability of aperture *** study addressed the validity of using the DFN approach for geomechanical modelling of fractured rock masses and also has implications for flow simulations.

关键词： Geomechanical modelling AFN DFN fracture

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Experimental study on deformation and strength properties of microfissured rock

引用

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

作者： Ronggui Deng Zhibin Zhong Xiaomin Fu Weimin Xiao Jing Yin School of Civil Engineering Southwest Jiaotong UniversityChengdu State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu

ISBN: (纸本)9781138000575;1138000574

Natural rocks often contain a large number of microfissures that have great effect on the deformation, strength and failure mechanism of *** engineering construction will change the stress magnitude and stress state,thus causing microfissure to propagate until a macroscopic failure plane is *** order to study the strength properties of such microfissure rocks,and provide basic data for investigating the water inflow and mud burst mechanism of tunnel excavated in microfissure-well-developed rocks,a series of triaxial compression tests under different loading path are carried out on rock specimens drilled from rhyolite blocks taken from the site of Daxiangling Niba mountain *** strength and deformation properties of microfissure rock are obtained;the influences of factors such as the initial angle of the microfissure and morphology on the strength and deformation-failure of microfissure rock are analyzed.

关键词： Experimental study on deformation and strength properties of microfissured rock

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A particle-based model for studying anisotropic strength and deformation of schist

引用

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

作者： Weijiang Chu Chunsheng Zhang Jing Hou Hydrochina Huadong Engineering Corporation

ISBN: (纸本)9781138000575;1138000574

The laboratory results of axial compression test with different angle between loading direction and normal direction of bedding plane are *** to the high density of bedding plane in the schist, the test result show a significant anisotropic in uniaxial compressive strength and Young's *** results of strength and Young's Module when bedding plane is horizontal are larger than the test results of any other bedding plane ***'s difficult to simulation the anisotropic strength and deformation response during the compression test with constitutive *** bonded particle model and smooth-joint model in PFC(Flow Particle code) was used to mimic *** rock host of schist was simulated by parallel-bonded particle, and the high density bedding plane was simulated by smooth-joint *** compression tests with different load angle was simulated,a good agreement was observed between experiment results and simulation results.

关键词： PFC A particle-based model for studying anisotropic strength and deformation of schist UCS

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Research and application of the relation of dielectric constant and moisture content of red clay

引用

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

作者： Gao Lu Ning Li School of Civil Engineering and Architecture Xi'an University of Technology

ISBN: (纸本)9781138000575;1138000574

In a shallow-buried and soft surrounding rock road tunnel,landslides in working face frequently *** is necessary to timely explore the geology in front of the working face such as litho-logy,moisture content and so *** Penetrating Radar can forecast the moisture content in the tunnel *** this article,we focus on the analysis of attenuation mechanism of electromagnetic wave in the moist red clay,and establish a mathematical *** means of large amount of lab experiments,the relation of moisture content and dielectric constant of the red clay has been discussed.A new way of fitting the theoretical formula of red clay to eliminate the errors in data processing is ***,the results of excavation construction of tunnel in Henan verify the rationality of the ***,it can be provided reference material and an extended example for similar project.

关键词： Research and application of the relation of dielectric constant and moisture content of red clay red

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Study on rock classification with physical property of coal reservoir

引用

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

作者： J.Guo P.Xia F.Xie Q.M.Yang School of Civil Engineering and Architecture Wuhan Polytechnic University Wuchang University of Technology

ISBN: (纸本)9781138000575;1138000574

Coal reservoir in Shanxi is influenced by sedimentary environment,diagenesis and *** reservoir is characterized by heterogeneity and nonlinearity *** intelligence evaluation model,based on modified particle swarm optimization(MPSO) algorithm with Elman neural network(ENN),is constructed. The model is corresponding to reservoir physical property by the use of logging,core and test data,and it is employed to classify rock types of coal *** case results indicate that this model is feasible and effective in the rock classification,so it provides an effective method for identification of lithology and mineral rock classification.

关键词： net Study on rock classification with physical property of coal reservoir

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Role of borehole transverse notching on hydraulic fracturing in hard rock

引用

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

作者： H.P.Kang Y.J.Feng Coal Mining and Design Branch China Coal Research Institute

ISBN: (纸本)9781138000575

The roof composed of hard and thick strata cannot cave in time with advance of working face in underground coal mining,which leads to extensive overhanging or unsupported areas in the gob and strong loading on supports in working face and entries.A successful technique for hard roof control is recognized as directional hydraulic fracturing through creating directional fractures in roof to weaken its integrity.A comprehensive investigation into stress distribution around borehole and fracture propagation patterns was carried out in this paper through theoretical analysis,numerical modeling and field *** element code ABAQUS was employed for the analysis of stress distribution at transverse notching tip and effect of transverse notching on fracturing initiation condition and orientations,which was verified further by the field *** notching plays an important role on borehole sealing,fracturing propagation in large scope and fracturing at freewill section in boreholes.

关键词： Role of borehole transverse notching on hydraulic fracturing in hard rock

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