煤矿深部流变岩体中压力传感器的应力分布规律

Stress Distribution of Sensor Embedded in Deep Rheological Rock Mass of Coal Mine

流变应力恢复法是针对煤矿深部软岩而提出的一种地应力测量新方法,该方法基于煤矿深部软岩的强流变力学行为,采用在围岩钻孔中埋设压力传感器的方法来获取实测应力,进而根据压力传感器的实测应力来分析岩体的初始应力。为了解压力传感器在煤矿深部流变岩体中的测量特性,对流变岩体中埋设压力传感器并注浆回填的二维平面应变问题进行理论分析,推导岩体为黏弹性三参量固体模型和Burgers模型时压力传感器实测应力的解析解;通过参数分析,揭示浆液凝固时间、浆液力学性质及岩体黏弹性参数对压力传感器实测应力的影响规律。

The rheological stress recovery method is a new geostress measurement method especially appropriate for deep soft rock.According to this method, the pressure transducers are embedded into the boreholes of surrounding rock. The geostress of surrounding rock can be obtained by analyzing the measured pressure. In order to know the measuring properties of transducers in deep rheological rock mass, the two-dimensional plane strain problem of transcoder embedded in rock mass is discussed. The analytical solutions of stress distribution of transducer are deduced by assuming rock mass satisfying three-parameter solid model and Burgers model. Then, the influence of setting time of slurry, the mechanical property of slurry and the viscoelastic parameters of rock mass on the measured stress of transducer is investigated by parameters analysis.