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| 1 | NUMERICAL MODELING FOR COUPLED THERMO-HYDRO-MECHANICAL AND CHEMICAL PROCESSES (THMC) OF GEOLOGICAL MEDIA——INTERNATIONAL AND CHINESE EXPERIENCES显示文摘The coupled thermo-hydro-mechanical and chemical (THMC) processes of stress/deformation,fluid flow,temperature and geochemical reactions of the geological media,namely fractured rocks and soils,play an important role in design,construction,operation and environmental impact assessments of rock and soil engineering works such as underground nuclear waste repositories,oil/gas production and storage,geothermal energy extraction,landslides and slope stability,hydropower and water conservancy complexes,etc. This paper presents an overview of the international and Chinese experiences in numerical modeling of the coupled THMC processes for both the state-of-the-knowledge,remaining challenges and possible future prospects. | Jing Lanru,Feng Xiating (Institute of Rock and Soil Mechanics,The Chinese Academy of Sciences, Wuhan 430071 China) | 2003 | 岩石力学与工程学报2003，22，10： | 17 |
| 2 | Numerical evaluation of strength and deformability of fractured rocks显示文摘Knowledge of the strength and deformability of fractured rocks is important for design, construction and stability evaluation of slopes, foundations and underground excavations in civil and mining engineering. However, laboratory tests of intact rock samples cannot provide information about the strength and deformation behaviors of fractured rock masses that include many fractures of varying sizes, orientations and locations. On the other hand, large-scale in situ tests of fractured rock masses are economically costly and often not practical in reality at present. Therefore, numerical modeling becomes necessary. Numerical predicting using discrete element methods(DEM) is a suitable approach for such modeling because of their advantages of explicit representations of both fractures system geometry and their constitutive behaviors of fractures, besides that of intact rock matrix. In this study, to generically determine the compressive strength of fractured rock masses, a series of numerical experiments were performed on two-dimensional discrete fracture network models based on the realistic geometrical and mechanical data of fracture systems from feld mapping. We used the UDEC code and a numerical servo-controlled program for controlling the progressive compressive loading process to avoid sudden violent failure of the models. The two loading conditions applied are similar to the standard laboratory testing for intact rock samples in order to check possible differences caused by such loading conditions. Numerical results show that the strength of fractured rocks increases with the increasing confning pressure, and that deformation behavior of fractured rocks follows elasto-plastic model with a trend of strain hardening. The stresses and strains obtained from these numerical experiments were used to ft the well-known Mohr-Coulomb(MC) and Hoek-Brown(H-B) failure criteria, represented by equivalent material properties defning these two criteria. The results show that both criteria can provide fair estimates of the compressive strengths for all tested numerical models. Parameters of the elastic deformability of fractured models during elastic deformation stages were also evaluated, and represented as equivalent Young's modulus and Poisson's ratio as functions of lateral confning pressure. It is the frst time that such systematic numerical predicting for strength of fractured rocks was performed considering different loading conditions, with important fndings for different behaviors of fractured rock masses, compared with testing intact rock samples under similar loading conditions. | Majid Noorian Bidgoli Zhihong Zhao Lanru Jing | 2013 | Journal of Rock Mechanics and Geotechnical Engineering2013，5，6： | 9 |
| 3 | Evaluation of hydrodynamic dispersion parameters in fractured rocks显示文摘A numerical procedure to determine the equivalent hydrodynamic dispersion coefficients and Péclet number(Pe) of a fractured rock is presented using random walk particle tracking method.The geometrical effects of fracture system on hydrodynamic dispersion are studied.The results obtained from the proposed method agree well with those of empirical models,which are the scale-dependent hydrodynamic dispersion coefficients in an asymptotic or exponential form.A variance case is added to investigate the influence of longitudinal hydrodynamic dispersion in individual fractures on the macro-hydrodynamic dispersion at the fracture network scale,and its influence is demonstrated with a verification example.In addition,we investigate the influences of directional flow and stress conditions on the behavior of hydrodynamic dispersion in fracture networks.The results show that the magnitudes of the hydrodynamic dispersion coefficients are relatively smaller when the flow direction is parallel to the dip directions of fracture sets.Compressive stresses significantly reduce hydrodynamic dispersion.However,the remaining questions are:(1) whether the deformed fracture network under high stress conditions may make the scale-dependent hydrodynamic dispersion coefficients have asymptotic or exponential forms,and(2) what the conditions for existence of a well-defined equivalent hydrodynamic dispersion tensor are.They need to be further investigated. | Zhihong Zhao Lanru Jing Ivars Neretnieks | 2010 | Journal of Rock Mechanics and Geotechnical Engineering2010，2，3： | 5 |
| 4 | Anisotropy of strength and deformability of fractured rocks显示文摘Anisotropy of the strength and deformation behaviors of fractured rock masses is a crucial issue for design and stability assessments of rock engineering structures,due mainly to the non-uniform and nonregular geometries of the fracture systems.However,no adequate efforts have been made to study this issue due to the current practical impossibility of laboratory tests with samples of large volumes containing many fractures,and the difficulty for controlling reliable initial and boundary conditions for large-scale in situ tests.Therefore,a reliable numerical predicting approach for evaluating anisotropy of fractured rock masses is needed.The objective of this study is to systematically investigate anisotropy of strength and deformability of fractured rocks,which has not been conducted in the past,using a numerical modeling method.A series of realistic two-dimensional(2D) discrete fracture network(DFN)models were established based on site investigation data,which were then loaded in different directions,using the code UDEC of discrete element method(DEM),with changing confining pressures.Numerical results show that strength envelopes and elastic deformability parameters of tested numerical models are significantly anisotropic and vary with changing axial loading and confining pressures.The results indicate that for design and safety assessments of rock engineering projects,the directional variations of strength and deformability of the fractured rock mass concerned must be treated properly with respect to the directions of in situ stresses.Traditional practice for simply positioning axial orientation of tunnels in association with principal stress directions only may not be adequate for safety requirements.Outstanding issues of the present study and suggestions for future study are also presented. | Majid Noorian Bidgoli Lanru Jing | 2014 | Journal of Rock Mechanics and Geotechnical Engineering2014，6，2： | 4 |
| 5 | Hydraulic properties of fractured rock masses with correlated fracture length and aperture显示文摘 | Alireza Baghbanan Lanru Jing | 2006 | International Journal of Rock Mechanics and Mining Sciences2006，，5： | 2 |
| 6 | Determining the Equivalent Permeability Tensor for Fractured Rock Masses Using a Stochastic Rev Approach : Method and Application to the Field Data From Sellafield, Uk 显示文摘 | Ki-Bok MIN Lanru JING Ove STEPHANSSON | 2004 | Hydrogeology Journal2004，12，5： | 1 |
| 7 | Modeling of damage, permeability changes and pressure responses during excavation of the TSX tunnel in granitic rock at URL, Canada显示文摘 | Jonny Rutqvist Lennart B?rgesson Masakazu Chijimatsu Jan Hernelind Lanru Jing Akira Kobayashi Son Nguyen | 2009 | Environmental Geology2009，，： | 1 |
| 8 | Modeling of fluid flow and solid deformation for fractured rocks with discontinuous deformation analysis ( DDA ) method 显示文摘 | JING Lanru YUE Ma ZU Liefang | 2001 | lnt J Rock Mech Min Sci2001，38，3： | 1 |
| 9 | Determining the equivalent permeability tensor for fractured rock masses using a stochastic REV approach:Method end application to the field data from Sellafield,UK显示文摘 | Ki-Bok Min Lanru Jing Ove Stephansscn | 2004 | Hydrogeolngy Journal2004，12，： | 1 |
| 10 | Numerical determination of the equivalent elastic compliance tensor for fractured rock masses using the distinct element method显示文摘 | Ki-Bok Min Lanru Jing | 2003 | International Journal of Rock Mechanics & Mining Sciences2003，40，： | 1 |
| 11 | Numerical modeling of coupled thermo-mechanical response of a rock pillar显示文摘Understanding the rock mass response to excavation and thermal loading and improving the capability of the numerical models for simulating the progressive failure process of brittle rocks are important for safety assessment and optimization design of nuclear waste repositories.The international cooperative DECOVALEX-2011 project provides a platform for development,validation and comparison of numerical models,in which the ?sp? pillar stability experiment(APSE) was selected as the modeling target for Task B.This paper presents the modeling results of Wuhan University(WHU) team for stages 1 and 2 of Task B by using a coupled thermo-mechanical model within the framework of continuum mechanics.The rock mass response to excavation is modeled with linear elastic,elastoplastic and brittle-plastic models,while the response to heating is modeled with a coupled thermo-elastic model.The capabilities and limitations of the model for representation of the thermo-mechanical responses of the rock pillar are discussed by comparing the modeling results with experimental observations.The results may provide a helpful reference for the stability and safety assessment of the hard granite host rock in China's Beishan preselected area for high-level radioactive waste disposal. | Yifeng Chen Chuangbing Zhou Lanru Jing | 2010 | Journal of Rock Mechanics and Geotechnical Engineering2010，2，3： | 1 |
| 12 | Effects of model scale and particle size on micromechanical properties and fail- ure processes of rocks--A particle mechanics approach 显示文摘 | Tomofumi Koyama Lanru Jing | 2007 | Engineering Analysis with Boundary Elements2007，31，： | 1 |
| 13 | The DECOVALEX Ⅲ project:A summary of activities and lessons learned显示文摘 | Lanru Jing Ove Stephansson | 2005 | Int J Rock Mech Min Sci2005，42，6： | 1 |
| 14 | An effective thermal conductivity model of geological porous media for coupled therrno-hydro-mechanical systems with multiphase flow显示文摘 | TONG FUGUO JING LANRU ZIMMERMAN R W | 2009 | International Journal of Rock Mechanics and Mining Sciences2009，46，8： | 1 |
| 15 | Effects of model scale and particle size on micromechanical properties and failure processes of rocks-A particle mechanics approach显示文摘 | TOMOFUMI KOYAMA LANRU JING | 2007 | Engineering Analysis with Boundary Elements2007，31，： | 1 |
| 16 | Determining the equivalent permeability tensor for fractured rock masses using a stochastic REV approach: Method and application to the field data from Sellafield, UK显示文摘 | Ki-Bok Min Lanru Jing Ove Stephansson | 2004 | Hydrogeology Journal2004，，5： | 1 |
| 17 | Particle me- chanics model for the effects of shear on solute retardation coefficient in rock fractures显示文摘 | Zhihong Zhao Lanru Jing Ivars Neretnieks | 2012 | International Journal of Rock Mechanics ~ Mining Sciences2012，，52： | 1 |
| 18 | DECOVALEX-An international co-operative research project on mathematical models of coupled THM processes of safety analysis of radioactive waste repositories显示文摘 | JING LANRU TSANG C F STEPHANSSON O | 1995 | International Journal of Rock Mechanics and Mining Sciences & Geomechanies Abstracts1995，32，5： | 1 |
| 19 | Particle meehan ics model for the effects of shear on solute retardation coeffi- cient in rock fractures显示文摘 | Zhihong Zhao Lanru Jing Ivars Neretnieks | 2012 | International Journal of Rock Me- chanics & Mining Sciences2012，52，2012： | 1 |
| 20 | Theoretical and experimental studies on the fluid-solid coupling processes for oil recovery from low permeability fractured reservoirs显示文摘 | Liu Jianjun Feng Xiating Jing Lanru | 2004 | International Journal of Rock Mechanics and Mining Sciences2004，41，3： | 1 |
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