村庄下条带开采留设煤柱充填回采安全性研究

Research on safety of backfill mining strip pillars under villages

为探究充填回采条带留设煤柱的安全可行性,首先,提出条带开采留设煤柱充填回采方案,通过理论计算充填体荷载及强度,分析充填体的稳定性;其次,根据条带开采后岩层移动情况确定预计参数,采用概率积分法计算充填回采后地表移动与变形,结合建筑物损坏等级评定标准,分析地表建筑受损情况,验证充填回采条带煤柱的适用性;最后,以佛店村庄下充填回采条带煤柱为实例进行分析。结果表明：条带充填体荷载22. 3 MPa,充填体强度31. 3 MPa,充填体安全系数1. 41,可使地表保持长期稳定。采用充填回采方案可将地表移动变形控制在Ⅱ级变形范围内,使地表建筑的正常使用不受影响。

In order to explore the safety and feasibility of miningtheretaining strip pillars with backfill,firstly,a backfill plan was proposed,and the stability of filling body was analyzed by calculating the load and strength of filling body. Then,the prediction parameters were determined according to the movement of rock strata after strip mining. The probability integral method was used to predict the surface movement and deformation after backfill. The damage to surface buildings was analyzed to verify the applicability of backfill with evaluation standards for building damage.Lastly,backfill mining strip pillars under the Fodian villages were taken as an example,researches on and analyses of which were carried out. The results show that the backfill load is 22. 3 MPa,the backfill strength is 31. 1 MPa,the backfill safety factor is 1.41,which can maintain long-term stability of the ground, and that the ground surface movement and deformation controlled by backfill is in the range of Ⅱ-level,and the normal use of the surface buildings will not be affected by backfill.