井筒变形预测与保护措施研究

针对鹤壁二矿井筒与工业广场保护煤柱的开采，确定了采用膏体充填分层下行式开采的方法，并计算出了允许的地表最大下沉系数为0.15。在此开采方法下，进行了井筒变形的预测，得出随着工作面向井筒推进，井筒下沉和拉伸变形也相应变大，当工作面推过井筒50 m时，井筒变形达到稳定；并根据预测结果进行了保护措施的选择。

Study on Shaft Deformation Forecast and the Protective Measures

In this paper,aiming at the mining of the portal and industrial area pillars,the author decided to adopt the paste backfilling with slicing descending mining method and figured out that the allowable subsiding ratio is 0.15.Based on this mining method,the portal deformation prediction was conducted.As a consequence,the conclusion was that the portal would subside and the stretching deformation could become greater with the working face advancing towards the portal.What’s more,the portal deformation would become stable when the working face was approximately 50m in the front of the portal.Addition to that,protecting measures were chosen on the basis of the predicting results.