RESEARCH ON COEFFICENT OF BRITTLE STRESS DROP OF BRITTLE-PLASTIC ROCKS AND ITS APPLICTION
The complete stress-strain curve of rock could be divided into pre-failure and post-failure regions according to the peak stress. The post-failure mechanical characteristics of rock are corresponding to many rock engineering, such as underground excavation, pillar, rock burst and so on. Therefore, the research on the post-failure characteristics of rock is of important significance both in theory and in practice. In general, the post-failure region of rock shows instability in the mechanical response, which is difficult to be described by the strength soften model, and should be described by the elastic-brittle-plastic model. Keeping the strain rate of axial as a constant, a series of triaxial conventional compress failure tests about marble of Yaan, red sandstone of Guixi and granite of Dawu were performed by RMT-150B rock mechanics test system, and the complete stress-strain curves of rock specimens under different confining stresses were obtained. Utilizing the stress-strain curves, the relation function between brittle stress drop and confining stress of marble was obtained. Based on this, elastic-plastic constitutive model, ideal elastic-brittle-plastic constitutive model and non-ideal elastic-brittle-plastic constitutive model are employed to analyze the deformation and plastic zone of the rock mass surrounding the underground workshops of some hydroelectric power station after the completion of excavation. Therefore, the beneficial reference was provided when applied elastic-brittle-plastic model to numerical analysis about brittle-plastic rock medium and its structures as well.
elastic-brittle-plastic constitutive post-failure coefficient of brittle stress drop numerical calculation
Gui-Cai SHI Xiu-Run GE Yun-De LU
Department of Civil Engineering, Shanghai Jiaotong University, China School of Civil Engineering and Department of Civil Engineering, Shanghai Jiaotong University, China
国际会议
International Symposium on Geoenvironmental Engineering(国际环境岩土工程研讨会
杭州
英文
413-419
2009-09-08（万方平台首次上网日期，不代表论文的发表时间）