受载岩石电阻率特性的试验研究

Experimental study on resistivity properties of rocks under loading

在单轴加卸载条件下,对砂岩、泥岩和灰岩三种岩石进行了电阻率特性的试验研究,分析了岩石电阻率随应力变化的规律。结果表明:三种岩石电阻率随应力变化的规律基本一致,都表现为低应力阶段电阻率的急剧降低和较长时间的平缓降低,直到岩石发生破坏。岩石电阻率的这种变化与岩石中空隙裂隙的闭合、扩展等有关,能够对应岩石的应力—应变曲线,反映了岩石在受载破坏过程中应力的变化情况,解决了与应力状态有关的问题。

Under the single axial loading and unloading conditions, the experimental study on the resistivity properties of three kinds of rocks such as sandstone, mudstone and limestone rock is carried out, and the rock resistivity change rules under stresses are analyzed. The results show that the change rules of the three rock resistivities are basically consistent, which lower sharply in the low stress stage and lower gently in a long time, until the rock damaged. The change of rock resistivity is related to the close and development of the pores and fractures, which may correspond to the rock stress-strain curves, and reflect the changing characteristics of stress in the destruction process of rock and solve the problems related to stress.