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由充填体常规三轴压缩强度和变形试验得到了峰荷应力和应变及相关试验曲线,对充填体三轴受压渐进破坏过程进行了描述分析。试验中看到,充填体在轴压下产生的裂缝的发展因施加围压而受到抑制,这种约束与围压成正比,即充填体破坏形式从零或低围压的脆性破坏到高围压的塑性软化流动。工程实际中,充填体多数情况下处于多轴受力状态,因此对充填材料进行多轴应力下的强度和变形行为研究具有现实意义。
The peak stress, strain and related test curves were obtained from the conventional triaxial compression strength and deformation tests of the filling body. The progress of the triaxial compression asymptotic failure process of the filling body was described and analyzed. The experiment shows that the development of cracks in the filling body under axial compression is suppressed due to the application of confining pressure, which is proportional to the confining pressure, ie the failure form of the filling body changes from the brittle failure of zero or low confining pressure to the high surrounding Pressure plastic softening flow. In engineering practice, the filling body is under multi-axial force in most cases. Therefore, it is of practical significance to study the strength and deformation behavior of the filling material under multi-axial stress.