一种预测地下岩石主应力的方法

摘要

依据静态物体受力平衡的条件,推导地下岩层测量点的地应力方程,并以此方程建立相应的莫尔圆,从而得到地下岩层所受的垂直主应力以及水平最大和最小主应力的数学表达式.依据岩石的Kaiser效应,设计Kaiser地应力测量系统.利用莫尔应力圆测量被施压岩石样品的声发射事件从而预测地下岩层3个主应力.实验结果表明,当岩石产生微裂缝时,其应力能短暂释放,声发射的幅度和频率都会突然增大.%Based on the mechanics equilibrium condition of static body,the in-situ stress equations of a measuring point in underground rock is derived and the corresponding Mohr's circle is set up in this paper.A mathematical expressions of three principal stresses in rocks is then obtained and the corresponding Kaiser in-situ stress measuring system is also designed according to the Kaiser effect in rocks.Through this Mohr's circle method,the three principal stresses in rocks can be predicted via detected acoustic emissions.Experiments show that when microfracture is produced in rock sample,its energy release temporarily and the amplitude and frequency of the acoustic emission increase suddenly.