基于六向压应力传感器流变应力恢复法的地应力测量

In-situ Stress Measurement Employing Rheological Stress Recovery Method with Six-direction Stress Sensor

流变应力恢复法是针对深部具有流变性的软弱围岩提出的一种地应力测量方法。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围岩原岩应力和扰动应力的测量。基于最新研发的光纤光栅式六向压应力传感器以及本安型光纤光栅解调仪,开展了传感器的室内标定试验。依托平煤股份八矿深部软岩巷道,开展了流变应力恢复法现场地应力测量,并与传统套芯应力解除法地应力测试结果进行对比分析,验证了利用六向压应力传感器流变应力恢复法对地应力测试的准确性和可靠性。

A rheological stress recovery method was proposed to measure the stress of rheological weak rock masses in depth.In the method,stress sensors are embedded in the borehole of surrounding rock to obtain in-situ static and induced stresses.Based on the newly developed six-direction fiber Bragg grating stress sensor and intrinsic safety fiber bragg grating demodulation instrument,a calibration test of the stress sensors was conducted.Taking the deep soft rock roadway in Pingdingshan No.8 coal mine as the case,in-situ stress was measured employing rheological stress recovery method,and the measurement results were compared and analyzed with those of the traditional over-coring stress relief method,which verified the accuracy and reliability of the in-situ stress measurement by rheological stress recovery method with six-direction stress sensors.