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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。
In order to understand the effect of magnetic induction produced by rock extrusion, NdFeB magnetic cores were implanted into cylindrical marble and limestone, respectively, to generate magnetic field around them. With the help of the fracture, the three-variable tests of stress, strain and magnetic induction during the extrusion process were carried out. The results show that the change of the rock fissures can cause the change of the magnetic induction intensity, and the stress-strain-magnetic strength has a one-to-one correspondence. Before the maximum stress is reached, the magnetic induction intensity around the marble and the limestone increases abnormally. In the rock cracking stage, the stress-strain curve and the magnetic-strain-strain curve have definite antisymmetry. Finally, the fitting formula of rock stress-magnetic induction intensity is established.