The influence of clay layer to mine pressure behaviors of thin bedrock working face
In order to solve the problem of safety mining in thin bedrock with thick surface working face in the Zhangji Coalmine, Huainan Mining Industry, the overlying strata movement rules are studied by theoretical and in-situ measurement.The results indicates that the stable of voussoir beam structure have relations with the bedrock thickness and mechanical properties and thickness of surface soil;the overlying clay layer can form a natural equilibrious arch and the clay layer cohesion, internal friction angle and thickness of surface soil over the clay layer are the influential elements for the limit span of natural equilibrious arch.According to the engineering geological conditions of 1611(3) working face in Zhangji Coalmine,Huainan Mining Industry, it shows that the limit span of natural equilibrious arch is 70 m, longer than the first weighing interval 41.4 m and periodic weighting interval 25 m.In the limited advance distance, the natural equilibrious arch can bear the effect of the surface soil to the thin bedrock.This research results has been proved successfully in the field test of 1611 (3) working face.
thin bedrock clay layer natural equilibrious arch voussoir beam structure
XU Hong-bin TU Min
School of Mining and Safety, Anhui University of Science and Technology ,Huainan 232001, China
国际会议
International Mining Conference 2014(2014国际采矿论坛)
安徽淮南
英文
450-454
2014-09-19（万方平台首次上网日期，不代表论文的发表时间）