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                        Research on influence of structural plane characteristics and stress boundary
                                         on permeability coefficient of rock mass

                                           1           1          2           1          1
                               REN Zhishan ,GUO Yufei ,LIU Heyi ,LIU Lijian ,LIU Heng
                         (1. Beijing General Municipal Engineering Design & Research Institute Co.,Ltd. ,Beijing  100082,China;
                                2. China Institute of Water Resources and Hydropower Research, Beijing  100048,China)



                   Abstract: The permeability of fractured rock mass is an important parameter to study groundwater prob⁃
                   lems,which not only depends on the occurrence law of structural plane,but also is related to the in-situ
                   stress environment. In this paper, considering the randomness of discontinuity distribution, the influence of
                   discontinuity characteristics and stress boundary conditions on the equivalent permeability of fractured rock
                   mass is studied by using UDEC software and several numerical analysis models. The results show that the
                   dip angle, spacing, width and trace length of fractures have obvious effects on the permeability of rock
                   mass. When the dip angle of fractures is close to the main seepage direction, the permeability coefficient
                   of rock mass in this direction is higher. The permeability coefficient of rock mass decreases as a power
                   function with the increase  in crack spacing,and increases with the increase in crack width. Each permea⁃
                   bility component increases with the increase in trace length,but the growth rate becomes slower. The in-si⁃
                   tu stress field of rock mass has obvious influence on the permeability coefficient of rock mass. The in⁃
                   crease of in-situ stress level will lead to the decrease of effective hydraulic gap width, and then reduce
                   the permeability of rock mass. The permeability coefficient changes linearly with the change of in-situ stress.
                   Keywords:fractured rock mass;permeability tensor;UDEC;structural plane;stress boundary

                                                                                   (责任编辑:王学凤)








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