流变岩体中六向压应力传感器的应力恢复规律

Stress Recovery Law of Six-Direction Pressure Sensor Embedded in Rheological Rock

流变应力恢复法是针对煤矿深部流变岩体而提出的1种地应力测量方法,该方法采用在巷道围岩中钻孔埋设压应力传感器的方式来实现对围岩原岩应力和扰动应力的测量,掌握流变岩体中传感器实测应力的恢复规律是流变应力恢复法地应力测量的关键问题之一。基于流变应力恢复法测量原理和研发的六向压应力传感器,采用数值方法模拟了基于六向压应力传感器的流变应力恢复法地应力测量过程,研究了不同岩石类型、围岩等级、流变模型以及地应力下六向压应力传感器实测应力的恢复规律。模拟结果表明:围岩流变性越强,传感器应力恢复至最终稳定值所需时间越短,且传感器应力恢复程度越高。

Rheological stress recovery(RSR)method was suggested to measure the in-situ stress and disturbance stress of rock mass involving time-dependent behavior.It was carried out by embedding six-direction pressure sensor into the borehole of surrounding rock with grout filling.Mastering the measured stress recovery property of the sensor in the rheological rock mass is one of the key problems for the RSR method.Based on the measurement principle of RSR method,the numerical method is adopted to simulate stress measuring process of RSR method employing the six-direction pressure sensor.The recovery law of measured stress of six-direction pressure sensor under different rock types,surrounding rock grades,rheological models and geostress states are studied respectively.The simulation results show that the stronger of the rock rheology,the shorter of the time required for the sensor stress recovery to the final stable value,and the higher of the stress recovery degree of the sensor.