采动地表裂缝发育范围异常扩大成因分析

Expansion Cause Analysis of the Abnormal Scope of Surface Crack Induced by the Mining Influence

蔚州矿区单侯煤矿的二采区6208工作面在村庄保护煤柱外进行常规开采过程中,工作面靠近村庄一侧的地面裂缝发育范围出现了异常的扩大,并引起了地表裂缝扩大区的村庄建筑物出现了严重的损坏。通过对地表裂缝发育的位置、延展特征进行的详细分析,结合研究区域地表裂缝规律、开采条件及地层状况等,确定了6208工作面靠近村庄侧的综合裂缝角,采用类比、排除等方法对地面裂缝发育及村庄损害范围扩大的成因进行了深入研究,得出结论:在单侯煤矿6208工作面东北侧为逆断层上盘的断裂带发育区,断层带区域岩层破碎,致使岩层整体硬度降低、结构松散,进而改变了原有的采动影响传播规律,造成了地表裂缝发育及村庄建筑物损坏范围扩大。

During the normal mining activity at the 6208 working face outside of protective coal pillar in village in No. 2Mining Area of Danhou coal mine in Yuzhou mine,the development scope of ground fissure on one side of the face near the village appeared abnormal expansion,and the village buildings at surface crack expanding area appeared serious damage. Through analyzing in detail the location and the characteristics of the surface crack growth,and combining with ground fissure rules,mining conditions and ground formation condition,the comprehensive crack angle of 6208 working face near the village was determined. The ground fracture development and the causes for the scope expanding of the village damage were studied by the methods of analogy and elimination. It is concluded that the northeastern 6208 working face in Danhou Coal Mine is the fault development zone of the upper reversed fault. Rock fractures in fault zone result in the hardness of rock reduced and the structure loosened. So,the original propagation law by mining influence is changed,leading to the expansion of the surface crack development and the village building damage.