采动地表沉降时间函数的确定方法及其应用

Determination Method of Surface Subsidence Time Function and Its Application

为了对煤矿井下回采工作面推进过程中地表点沉降的位移量进行准确预测,以为地面煤层气开发钻井的工程防护和安全性预测提供准确的基础数据。建立了以回采速度、煤层埋藏深度和地表采动影响半径表征的地表沉降时间迟滞参数,准确的表征了不同矿区地质、回采条件下的地表及采场覆岩沉降的时间迟滞特性;同时,将该参数引入地表沉降曲线,建立了以矿区地表沉降参数和回采速度为基本参数的地表沉降时间函数。通过与兴隆庄煤矿地表沉降监测数据的对比分析可知,地表沉降时间函数模型的预测结果与实际监测结果是基本一致的,从而证明了模型函数的正确性。

To accurately predict displacement of surface subsidence in the process of working face advancing and provide the basic data used for surface borehole engineer protection and safety prediction of surface coalbed methane development drilling,we set up the surface ground subsidence time hysteresis parameter based on the workface advance velocity,coal seam depth,surface ground subsidence influence radius which represents the time hysteresis character of different geology and mining methods in different coal mine regions.At the same time,this parameter is introduced to the surface ground subsidence curve function,the surface ground subsidence time function based on surface ground subsidence parameters and workface advance velocity is set up. After the contrast to the surface ground subsidence data in the Xinglongzhuang Coal Mine,the model prediction data were proved to be correct which suggests the surface ground subsidence time function is good in engineer application.