(1. School of Civil and Environment Engineering，University of Science and Technology Beijing，Beijing 100083，China； 2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines，University of Science and Technology Beijing，Beijing 100083，China；3. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China)
Abstract：On the background of an open-pit rock masses，some rock mechanics laboratory and field tests are implemented. Based on the particle flow theory and PFC3D(particle flow code in 3 dimensions)，equivalent rock mass(ERM) technique is used to construct ERM model，which reflects the distribution feature of the joints and meso-scale fracture effect. A load-unload code is developed by Fish language in PFC3D to study the strength and mechanical effect of the rock mass. Some study results are drawn as follows：(1) Under the condition of uniaxial compression，the axial stress-strain curve of ERM is divided into three stages，which includes elastic deformation，plastic deformation of unsteady fracture and deformation of post-failure. Compared with standard rock samples，compressive strength and elastic modulus of the ERM are significantly decreased. (2) With increase of confining pressure，compressive strength，residual strength and plasticity of ERM are enhanced. (3) The ERM technique efficiently can describe rock mass anisotropy induced by joints distribution. (4) Microcrack in ERM is distributed and extends along strike direction of joints. Therefore rock mass failures are controlled by properties of the dominant joints.
吴顺川,周喻，高利立，张晓平. 等效岩体技术在岩体工程中的应用[J]. 岩石力学与工程学报, 2010, 29(07): 1435-1441.
WU Shunchuan1，2，ZHOU Yu1，GAO Lili1，ZHANG Xiaoping3. APPLICATION OF EQUIVALENT ROCK MASS TECHNIQUE TO ROCK MASS ENGINEERING. , 2010, 29(07): 1435-1441.
