低煤层煤柱回采率与顶板和地表沉降研究

Study on coal recovery rate of low coal seam and roof and ground settlement

本文研究了低厚度浅煤层及覆岩的特性,在回撤作业中监测顶板和地表沉降,考虑了爆破对煤柱强度的影响,采用常规三维数值模型模拟了顶板沉降和常规方法预测地表沉降,与实测顶板和地表沉降进行了对比。研究表明,由于残余煤柱和低煤层导致实际顶板和地表沉降量均低于常规预测方法的沉降量。

In this paper, the characteristics of low-thickness shallow coal seams and overburden are studied. The roof and surface settlement are monitored during the retracement operation. The influence of blasting on the strength of coal pillars is considered. The conventional three-dimensional numerical model is used to simulate roof settlement and conventional methods to predict surface settlement. Compared with the measured roof and surface settlement. Studies have shown that the actual roof and surface settlement are lower than the settlement of con ventional prediction methods due to residual coal pillars and low coal seams.