岩石应力的电学效应及其断裂演化规律  

ELECTRICAL EFFECT OF ROCK STRESS AND ITS FRACTURE EVOLUTION LAWS

作　　者：陈耕野[1] 田军[1] 姚广仁[2] 

机构地区：[1]东北大学资源与土木工程学院结构工程研究所,辽宁沈阳110004 [2]东北大学信息科学与工程学院通讯实验室,辽宁沈阳110004

出　　处：《岩石力学与工程学报》2005年第11期1832-1840,共9页Chinese Journal of Rock Mechanics and Engineering

摘　　要：研究岩石离子导电基本规律和脉冲非极化电流测试方法,得出岩石电阻变化率与有效孔隙度变化率之间的理论关系;采用力学与电学参数结合的方法,研究压缩应力对含氯化钠溶液石灰岩、砂岩产生的电学效应,取得完整的应力–应变曲线和相应电阻–应变曲线试验数据。试验结果表明:岩石内部裂隙的变化将引起相应的岩石电阻改变;所有电阻–应变曲线上都存在一个岩石电阻最小值,并对应于岩石开裂应力;岩石断裂过程中,应力–应变曲线与电阻–应变曲线的变化规律具有明确的反对称性。岩石电阻变化能够明确表达压缩过程中复杂断裂的演化特性,提出并验证岩石断裂规律的状态方程。The basic laws of electrical conduction by ions for rocks and the measuring methods of pulse non-polarization for electrical current are studied. The theoretical relation between the rate of electrical resistance and that of porosity for rocks is explained. The study on the electrical effects of limestone and sandstone containing NaCl solution under compressive stress is presented with the method of combining mechanics and electricity. The experimental facility is established and the complete experimental data of stress-strain-electrical resistance of rocks are achieved. The experimental results indicate that the electrical resistance variation of rock fluctuates with the variation of the internal fissures of rock. There is a minimum value for electrical resistance of rock in all electrical resistance-strain curves, by which the cracking stress of rocks can be justified and defined. In the process of rock fracture, there is a clear anti-symmetry between the change law of stress-strain curve and that of electrical resistance. Based on the experimental study and the stochastic property analysis of rock fracture variation, the equations of stress-strain-electrical resistance in sections are proposed with a new distinguishing feature, by which the regular stress of rocks and the remnant stress can be described. The complicated fracture characteristic of rocks can also be displayed clearly by the electrical resistance of rocks. It further verifies the associated state equations with rock compression through fitting the calculated results of the experimental data for limestone and sandstone, which can be used to reveal the evolution laws of rock fracture.

关 键 词：岩石力学 岩石应力 电学效应 状态方程 断裂演化 

分 类 号：TD315[矿业工程—矿井建设]