在软岩中测量地应力传感器与围岩的相互作用

The Interaction between Sensor and Wall Rock in the Measurements of Strata Stress in Theological Rock

讨论了传感器引起的钻孔变形随时间的变化,最后推出了由测值反算地应力的公式,此方法称为流变法应力测量.通过实测数据,利用非线性最小二乘法求得原岩应力,流变法应力测量与孔壁应变法应力测量在应力大小和应力方向基本保持一致.

It is very difficult to obtain the cylinder core that fits to the requirement of strata stress measure in the rbeological rock mass, so it is very difficult to use the method of stress relief. New method based on the rheological of rock does not need the core samples obtained with coring bit. It is called method of boring deformation. When measuring strata stress, the rigidity of sensor can not be ignored comparing to the rock mass, the boring deformation with time is determined by strata stress as well as the contact between sensor an boring. The paper discusses the boring deformation with time caused by sensor, and finally derives the formula of strata stress that can be calculate through the measured value. Through the data of actual measurement, using method of nonlinear least squares, get rock stress , flow out the stress measure of political reform with the strain law stress measure of hole wall in stress size and stress direction basic maintenance consistent.