摘要
为了研究孔隙水压作用下岩石抗剪强度参数,进行了不同岩性岩石、不同孔隙水压条件下的三轴压缩试验,研究了抗剪强度参数计算方法。通过最小二乘法计算了采动岩体不同孔隙水压条件下黏聚力和内摩擦参数。研究表明:随着孔隙水压的增大,岩石黏聚力降低,当孔隙水压增至9MPa时,破坏岩体黏聚力降低至0MPa;细砂岩和粗砂岩黏聚力水压效应符合指数关系,随着水压的增高,黏聚力水压效应强度降低;除灰岩外,岩石内摩擦角随着静水压力的增高而降低。研究成果能够为分析孔隙水压下采矿围岩破坏规律提供依据。
In order to study rock shear strength relevant parameters under pore-space water pressure, different rock triaxial compression tests under different pore-space water pressure have been carried out; shear strength relevant parameters computation method studied. Using least square method has computed cohesion and internal friction parameters of mining rocks under different pore-space water pressure. The study has demonstrated that along with increasing pore-space water pressure, rock cohesion decreasing; when the pressure increased to 9MPa, rock failure cohesion decreased to 0MPa. The cohesion hydrostatic effects of fine sandstone and coarse sandstone accord with the exponential relationship, along with the increasing pressure, cohesion hydrostatic effect intensity will be decreased. Besides limestone, rock internal friction angle will be decreased along with hydrostatic pressure. The result can provide basis for surrounding rock mining failure pattern analysis.
出处
《中国煤炭地质》
2013年第4期30-33,共4页
Coal Geology of China
基金
国家自然科学基金重点资助项目(51034003)
中煤科工集团西安研究院技术创新基金资助项目(2011XAYCX011)
国家科技计划支撑课题(2012BAC10B03)
关键词
抗剪强度
三轴试验
黏聚力
内摩擦角
孔隙水压
shear strength
triaxial test
cohesion
internal friction angle
pore-space water pressure
