细砂岩峰后力学特性和材料强度研究

 通过细砂岩三轴试验，得到不同围压的应力-应变曲线和轴向应变-径向应变曲线，分析和研究了峰值点与断层产生点的不同。试验表明，岩石在断层产生之后沿断层面滑移，围压、岩块的材料强度和岩块排列的结构效应三者共同决定了岩石的峰后力学行为。将压缩试验得到的不规则岩块浇注在混凝土试样中，运用剪切仪进行了专门设计的剪切试验，获得岩块的材料强度。对比不同加载历史的岩块压剪试验数据，表明试验设计的围压对岩块材料强度影响很小，压缩实验和剪切实验得到的强度参数存在差异。

Study on Post- Peak Mechanics Features and Material Strength of Fine Sandstone

Based on triaxial tests of fine sandstone, the stress-strain curves at different confining pressures were obtained as well as axial strain-lateral strain curves. From the curves it was observed that stress peak point and the point of fault formation were different for the rock. It is shown that the fault is produced and fractured rock slides on the fault surfaces, while confining pressure, material strength and structure effect of blocks affect the post failure behaviour. Irregular blocks from the tests were poured in concrete samples and tested using a shear apparatus. Shear strength of rock blocks was attained. Compared to test results of block undergone different loading history, it is shown that designed confining pressures produce minor effefct to material strength of blocks and strength parameters from compression and shear tests have difference.