3109综采面覆岩垮落、裂隙带模拟与结果分析

Simulation and Result Analysis of Caving and Fracture Zone of Overlying Strata at Fully-mechanized Mining Face

工作面开挖后,上覆岩层将发生破断及垮落。为获得3109综采工作面覆岩垮落、裂隙带高度,本文采用相似模拟方法试验了工作面开采过程中覆岩破断演化过程。结果表明:直接顶的初次破断是垮落带发育的主要原因,而老顶的第一次周期来压则造成垮落带再次发育,裂隙带高度在老顶初次破断前发育较为缓慢,而在老顶发生破断后快速增加,并最终逐渐趋于稳定,3109工作面垮落带发育高度约12.2 m,裂隙带高度约33.0 m。

To obtain the height of caving and fracture zone of overlying strata at 3109 fully-mechanized mining face,the author introduces the application of the similarity simulation method to testing the evolution process of overlying strata failure at mining face,which shows that the first breaking of the direct roof is the main cause of caving zone development while the first weighting on the old roof results in the repeated development of caving zone;and fracture zone height develops slowly before the basic roof breaking,more quickly after breaking,and eventually gradually in stability trend.