STUDY OF FRACTURING ALGORITHM OF INTERMITTENT JOINT BY DDA AND EXPERIMENTAL VALIDATION
(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical
and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Research Institute of Highway Ministry of Transport，Beijing 100088，China)
Abstract：Virtual joint is adopted in the discontinuous deformation analysis(DDA)，which can provide path for block failure and fracture development. Therefore，the failure process of jointed rock mass is a progress of initiation，extending and connecting of joints inside rock mass；and attenuation of virtual joint mechanical parameters represents the strength attenuation in the process of rock failure. The attenuation law of virtual joint mechanical parameters is studied by introducing the definition of virtual joint connectivity rate；and the attenuation formula of virtual joint mechanical parameters is established. According to the phenomenon of mechanical parameters attenuation in rock failure，the strength criterion(Jennings criterion and the maximum tensile strength criterion) for intermittent jointed rock masses are studied. Programming the attenuation law of virtual joint mechanical parameters and improved strength formula of intermittent joint into DDA to simulate the fracturing process of intermittent joint. At last，the method is validated by comparing the computation results with shear test results.
夏才初1，2，许崇帮1，3. 非连续变形分析(DDA)中断续节理扩展的模拟方法研究和试验验证[J]. 岩石力学与工程学报, 2010, 29(10): 2027-2033.
XIA Caichu1，2，XU Chongbang1，3. STUDY OF FRACTURING ALGORITHM OF INTERMITTENT JOINT BY DDA AND EXPERIMENTAL VALIDATION. , 2010, 29(10): 2027-2033.
2010, Vol. 29 
