细砂岩峰后力学特性和材料强度研究  

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

作　　者：周纪军[1] 单仁亮[1] 王辉[1] 耿慧辉[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑学院,北京100083

出　　处：《煤炭工程》2011年第4期96-98,共3页Coal Engineering

摘　　要：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。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。With the triaxial test of the fine sandstone, different stress - strain curve and axial strain - radial strain curve of the surrounding rock were obtained. The difference between the peak point and the fault point was studied and analyzed. The experiment showed that the rock would be slidden along the fault surface after the fault occurred and the material strength of the surrounding rock and lump rock and the structure effect of the lump rock arrangement would jointly determine the post - peak mechanics behaviors of the rock. The compressive and shearing test data of the rocks with different loaded histories showed that the experiment designed surrounding rock would have a small influence to the reck material strength and there was a difference in the strength parameters between the compressive experiment and the shearing experiment.

关 键 词：径向应变 峰后力学特性 结构效应 材料强度 

分 类 号：TU458[建筑科学—岩土工程]