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对经过三向预加压的石灰岩试件所进行的试验研究表明,其声发射活动的特点与单向受力时的情况完全不同。此时,在一个试件的一次加载过程中会出现两次Kaiser效应,分别对应于载荷达到预加压时所施加的轴压与围压值之时。利用回归分析的方法来处理试验数据,可以使声发射活动对应力的响应关系用三条回归直线来近似。这三条直线的两个交点所对应的应力值,可以确定出预加压时岩石试件承受的应力状态。
Experimental studies on three-way pre-stressed limestone specimens show that the characteristics of acoustic emission activity are quite different from those under unidirectional stress. At this point, there will be two Kaiser effects during one loading of a specimen, corresponding to the axial pressure and confining pressure applied when the load reaches pre-stress. Using regression analysis to process the experimental data, the response of acoustic emission to stress can be approximated by three regression lines. The stress values corresponding to the two intersections of the three straight lines can determine the stress state of the rock specimen under pre-pressurization.