A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Research on Coefficent of Brittle Stress Drop of Brittle-Plastic Rocksand Itsappliction
Abstract 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 Ya&an, 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.
Research on Coefficent of Brittle Stress Drop of Brittle-Plastic Rocksand Itsappliction
Abstract 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 Ya&an, 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.
Research on Coefficent of Brittle Stress Drop of Brittle-Plastic Rocksand Itsappliction
SHI, Gui-Cai (author) / Ge, Xiu-Run (author) / Lu, Yun-De (author)
Advances in Environmental Geotechnics ; 413-419
2010-01-01
7 pages
Article/Chapter (Book)
Electronic Resource
English
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