【摘要】 为了弄清岩石挤压产生的磁感强度效应,将钕铁硼Nd-Fe-B磁芯分别植入圆柱形大理岩、石灰岩中,在其周围产生磁场。借助断裂使岩石导磁回路与磁强发生的改变,进行挤压过程中应力、应变和磁感强度三变量测试。研究结果表明:岩石裂隙变化能够引起磁感强度的改变,应力-应变-磁强存在一一对应的数值关系;达到最大应力前,大理岩、石灰岩周围磁感强度出现增大异常的破坏预兆;在岩石裂解阶段,应力-应变曲线与磁强-应变曲线的变化规律具有明确的反对称性。最后还建立了分段表达岩石应力-磁感强度拟合关系式。更多还原

【Abstract】 In order to fully understand the effect of magnetic induction intensity produced by rock compression,a magnetic core of Nd-Fe-B was implanted into cylindrical marble specimen and cylindrical limestone specimen,respectively,to produce magnetic field around the specimen.Three variables tests,including stress-strain-magnetic induction intensity,were carried out in the process of rock compression by means of the change of magnetic circuit and magnetic induction intensity due to rock fracture.Experimental results show that the variation of magnetic induction intensity around the rock is caused by the change of rock internal fissure,and there are corresponding numerical relations among the stress-strain-magnetic induction intensity.Before arriving the critical maximum stress,the abnormal increase of magnetic induction intensity around the marble and the limestone spesimens occurs respectively,which is an omen of rock disruption.During the rock disruptive stage,there is a definite anti-symmetry in the change of stress-strain curve and the change of magnetic induction intensity-strain curve.The rock stress-magnetic induction intensity relational expression was obtained by segmentally fitting.更多还原