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An Anisotropic Geomechanical Model for jointed rock masses at Taishan Nuclear Power Station, Southern China

Acta Geologica Sinica(English Edition) 2013年第3期87卷 858-870页

作者： ZHENG Wentang CHENG Xiaojiu WANG Huaan Guang Dong Electric Power Design Institute China Energy Engineering Group Co. Ltd.

An anisotropic geomechanical model for jointed rock mass is presented. Simultaneously with deriving the orthotropic anisotropy elastic parameters along the positive axis, the equivalent compliance matrix for the deflection axis orthotropic anisotropy was derived through a three- dimensional coordinate transformation. In addition, Singh＇s analysis of the stress concentration effects of intermittent joints was adopted, based on two groups of intermittent joints and a set of cross- cutting joints in the jointed rock mass. The stress concentration effects caused by intermittent joints and the coupling effect of cross-cutting joints along the deflection-axis are also considered. The proposed anisotropic mechanics parameters method is applied to determine the deformation parameters of jointed granite at the Taishan Nuclear Power Station. Combined with the deterministic mechanical parameters of rock blocks and joints, the deformation parameters and their variability in jointed rock masses are estimated quantitatively. The computed results show that jointed granite at the Taishan Nuclear Power Station exhibits typical anisotropic mechanical characteristics; the elastic moduli in the two horizontal directions were similar, but the elastic modulus in the vertical direction was much greater. jointed rock elastic moduli in the two horizontal and vertical directions were respectively about 24% and 37% of the core of rock, showing weakly orthotropic anisotropy; the ratio of elastic moduli in the vertical and horizontal directions was 1.53, clearly indicating the transversely isotropic rock mass mechanical characteristics. The method can be popularized to solve other rock mechanics problems in nuclear power engineering.

关键词： Nuclear Power Station jointed rock masses anisotropic characteristics constitutive model mechanical parameters

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A new estimation method and an anisotropy index for the deformation modulus of jointed rock masses

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Journal of rock Mechanics and Geotechnical Engineering 2022年第1期14卷 153-168页

作者： Bohu Zhang Junyan Mu Jun Zheng Qing Lv Jianhui Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500China Department of Civil Engineering Zhejiang UniversityHangzhou310058China Center for Balance Architecture Zhejiang UniversityHangzhou310007China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China

The deformation modulus of a rock mass is an important parameter to describe its mechanical *** this study,an analytical method is developed to determine the deformation modulus of jointed rock masses,which considers the mechanical properties of intact rocks and joints based on the superposition *** to incorporating the variations in the orientations and sizes of joint sets,the proposed method is applicable to the rock mass with persistent and parallel joints as well as that with nonpersistent and nonparallel *** addition,an anisotropy index AIdmfor the deformation modulus is defined to quantitatively describe the anisotropy of rock *** range of AIdmis from 0 to 1,and the more anisotropic the rock mass is,the larger the value of AIdmwill *** evaluate the proposed method,20 groups of numerical experiments are conducted with the universal distinct element code(UDEC).For each experimental group,the deformation modulus in 24 directions are obtained by UDEC(numerical value)and the proposed method(predicted value),and then the mean error rates are *** that the mean error rate is the mean value of the error rates of the deformation modulus in 24 directions,where for each direction,the error rate is equal to the ratio of numerical value minus predicted value to the numerical *** results show that(i)for different experimental groups,the mean error rates vary between 5.06%and 22.03%;(ii)the error rates for the discrete fracture networks(DFNs)with two sets of joints are at the same level as those with one set of joints;and(iii)therefore,the proposed method for estimating the deformation modulus of jointed rock masses is valid.

关键词： Deformation modulus Analytical method Anisotropy index jointed rock masses Mechanical behavior Discrete fracture network(DFN)

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Elasto-plastic Analysis of Circular Tunnels in jointed rock masses Satisfy the Hoek-Brown Failure Criterion

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Journal of China University of Mining and Technology 2007年第3期17卷 393-398页

作者： SUN Jin-shan LU Wen-bo ZHU Qi-hu CHEN Ming State Key Laboratory of Water Resource and Hydropower Engineering Science Wuhan University Wuhan Hubei 430072 China

The relationship between the Hoek-Brown parameters and the mechanical response of circular tunnels is il-lustrated. Closed-form and approximate solutions are given for the extent of the plastic zone and the stress and dis-placement fields under axisymmetrical and asymmetric stress conditions. For the same rock masses and under axisym-metrical stress conditions,the radius of the plastic zone in terms of Hoek-Brown criterion is generally an approximation of the radius in terms of the Mohr-Coulomb criterion. The radius in terms of the Hoek-Brown criterion is larger under low stress conditions. For poor quality rock masses (GSIrock bolts,etc.) that improve the GSI of rock masses are effective in improving the stability of tunnels. It is not advisable to improve the sta-bility of the tunnels by providing a small support resistance p through shotcrete,except for very poor quality jointed rock masses. Without reference to the quality of the rock mass,the disturbance factor D should not less than 0.5. Meas-ures which disturb rock masses during tunnel construction should be taken carefully when the tunnel depth increases.

关键词： jointed rock masses circular tunnel general Hoek-Brown failure criterion elasto-plastic analysis con-struction measures

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Characterization on jointed rock masses based on PFC2D

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Frontiers of Structural and Civil Engineering 2013年第1期7卷 32-38页

作者： Peitao WANG Tianhong YANG Qinglei YU Honglei LIU Penghai ZHANG p.o.box 138 northeastern universityshenyang 110819china

Geometrical parameters of discontinuities,such as spacing,length,dip and fault throw between joints have a great influence on the mechanical behavior of jointed rock *** characterization for discontinuities is important for investigate the stability of rock *** this paper,the PFC2D is combined with joint network generation method to examine the mechanical behaviors of jointed *** Miaogou Open-pit Mine as an example,the information and statistical distributions of discontinuities of the slope rock masses are measured by ShapeMetriX3D measuring ***,the automatic generation algorithm of random joints network based on the Monte-Carlo method is proposed using the programming language(FISH)embedded within *** algorithm could represent the discontinuities compared with the geological *** simulating the compression test of a jointed rock sample,the mechanical behavior and crack propagation were *** results reveal that the failure mode and crack propagation of the jointed rock are dominated by the distribution of joints in addition to the intact rock *** simulation result shows the feasibility of the joints generating method in application to jointed rock mass.

关键词： jointed rock masses shape metrix3D monte-carlo stochastic simulation method PFC2D

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Influence　of　geostatic　stresses　on　permeability　of　jointed　rock　masses

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Acta Seismologica Sinica(English Edition) 1997年第2期10卷 49-60页

作者：周创兵熊文林 1. Wuhan University of Hydraulic and Electric Engineering 430072 Wuhan China

In this paper, a new constitutive model for the deformation of rock discontinuities in a geostress field is proposed, the permeability tensor with consideration of coupled hy dromechanical behaviour of jointed rock masses is formulated. It is found that the influ ence of geostatic stresses on the permeability of jointed rock masses is caused mainly by af fecting the aperture of discontinuities and the flow paths in discontinuity networks; the hydraulic conductivity of jointed rock masses decreases in negative exponential relationwith the increase of embedded depth and in hyperbolic relation with the increase of lateral pressure coefficient. The theory of hydromechanical coupling is applicable in the study of reservoir induced earthquake.

关键词： jointed rock masses permeability geostatic stresses coupling

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Determination of mechanical parameters for jointed rock masses

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Journal of rock Mechanics and Geotechnical Engineering 2011年第S1期3卷 398-406页

作者： Xiaogang Wang Yufei Zhao Xingchao Lin China Institute of Water Resources and Hydropower Research Beijing100048China

Combining with empirical method, laboratory test and numerical simulation, a comprehensive system was presented to determine the mechanical parameters of jointed rock masses. The system has the following four functions: (1) Based on the field investigation of joints, the system can consider rock mass structures, by using network simulation technology. (2) rock samples are conducted by numerical simulation with the input engineering mechanical parameters of rocks and joints obtained from laboratory tests. (3) The whole stress-strain curve of jointed rock masses under certain normal stress can be plotted from numerical simulation, and then the shear strength parameters of jointed rock masses can be obtained from the whole stress-strain curves under different normal stresses. (4) The statistical values of mechanical parameters of jointed rock masses can be determined according to numerical simulation. Based on the statistical values, combining with engineering experiences and geological investigations, the comprehensive mechanical parameters of jointed rock masses can be achieved finally. Several cases are presented to prove the engineering feasibility and suitability of this system.

关键词： rock properties numerical modeling jointed rock masses

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Coupled model of heat-seepage-deformation FEM for jointed rock masses

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Progress in Natural Science:Materials International 2000年第12期 33-40页

作者：李宁陈波党发宁 Stale Key Laboratory of Enozen Soil Kngineering CAREER1 Chinese Academy of Sciences Lanzhon 730000 China Xi’an University of Technology Xi’an 710048 China Xi’an University of Technology Xi’an 710048 China Xi’an University of Technology Xi’an 710048 China

Based on the principles of equilibrium, continuity and conservation of energy of ihe, multi-phasejointed medium, a heat-seepage-deformation (MSI)) coupling model is established for the jointed rock masses in a cold region . A numerical solution using finite element method (KKM) tor this proposed model is developed on the platform of the Austrian software KINAI, and a test calculation is also conducted for the thermal elastic consolidation of a one-dimensional sand column made previously by Abouslil. The practical analysis for a coal mine subjected to a gas burning demonstrated that the surface settlement was not only related to the temperature variation, but also related to the water migration. When reducing the permeability coefficient of the rock mass greatly, the settlement increases only slightly due to the decrease of the pore water drainage. When increasing the conductivity slightly, the settlement increases greatly.

关键词： heat-seepage-deformation coupled model FEM jointed rock masses gas burning in mine.

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Characterization on jointed rock masses Based on PFC2D

Characterization on Jointed Rock Masses Based on PFC2D

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2012颗粒材料计算力学会议

作者： Wang Pei-Tao Yang Tian-Hong Yu Qing-Lei Liu Hong-Lei Zhang Peng-Hai P.O.Box 138, Northeastern University, Shenyang 110819, China

Geometrical parameters of discontinuities, such as spacing, length, dip and fault throw between joints have a great influence on the mechanical behavior of jointed rock masses. Accurate characterization for discontinuities is important for investigate the stability of rock masses. In this paper, the PFC2D is combined with joint network generation method to examine the mechanical behaviors of jointed mass. Taking Miaogou Open-pit Mine as an example, the information and statistical distributions of discontinuities of the slope rock masses are measured by ShapeMetriX3D measuring tool. Then, the automatic generation algorithm of random joints network based on the Monte-Carlo method is proposed using the programming language (FISH) embedded within PFC2D. This algorithm could represent the discontinuities compared with the geological surveys. In simulating the compression test of a jointed rock sample, the mechanical behavior and crack propagation were investigated. The results reveal that the failure mode and crack propagation of the jointed rock are dominated by the distribution of joints in addition to the intact rock properties. The simulation result shows the feasibility of the joints generating method in application to jointed rock mass.

关键词： jointed rock masses shape metrix3D monte-carlo stochastic simulation method PFC2D

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Mesoscopic properties of dense granular materials:an overview

Mesoscopic properties of dense granular materials:an overvie...

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2012颗粒材料计算力学会议

作者： Sun Qi-Cheng1 Jin Feng1Zhang Guo-Gua21 State Key Laboratory for Hydroscience and Engineering,Tsinghua University,Beijing 100083,China2 Department of Physics,Beijing University of Science and Technology,Beijing 100871,China

Geometrical parameters of discontinuities,such as spacing,length,dip and fault throw between joints havea great influence on the mechanical behavior of jointed rock *** characterization for discontinuities isimportant for investigate the stability of rock *** this paper,the PFC2D is combined with joint networkgeneration method to examine the mechanical behaviors of jointed *** Miaogou Open-pit Mine as anexample,the information and statistical distributions of discontinuities of the slope rock masses are measured byShapeMetriX3D measuring ***,the automatic generation algorithm of random joints network based on theMonte-Carlo method is proposed using the programming language(FISH) embedded within *** algorithmcould represent the discontinuities compared with the geological *** simulating the compression test of ajointed rock sample,the mechanical behavior and crack propagation were *** results reveal that thefailure mode and crack propagation of the jointed rock are dominated by the distribution of joints in addition to theintact rock *** simulation result shows the feasibility of the joints generating method in application tojointed rock mass.

关键词： jointed rock masses shape metrix3D monte-carlo stochastic simulation method PFC2D

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A New Stereo-Analytical Method for Determination of Removal Blocks in Discontinuous rock masses

A New Stereo-Analytical Method for Determination of Removal ...

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作者： P.H.S.W.Kulatilake Department of Mining & Geological Engineering University of Arizona

Summary:The paper provides a new stereo-analytical method,which is a combination of the stereographic method and analytical methods,to separate finite removable blocks from the infinite and tapered blocks in discontinuous rock *** methodology has applicability to both convex and concave *** of the methodology is illustrated through *** of this method to the existing block theory procedures available in the literature improves the capability of block theory in solving practical problems in rock engineering.

关键词： rock mass stability jointed rock masses block theory stereo-analytical method

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