摘要
为研究上保护层开采对被保护煤层的卸压范围,以淮北矿业集团海孜煤矿762保护层采面为研究对象,通过相似模拟试验,考察了保护层开采7#煤层顶底板岩层分带特征及被保护层9#煤应力、位移分布规律,并以此为依据,分析了保护层开采的保护范围。结果表明:762保护层采面充分开采条件下,通过实测结果计算得到倾向上、下有效卸压保护角分别为78°、79°,9#煤层最大膨胀率为0.81%。
In order to study the released range of the upper protective seam for the protected seam,it took No.762 protective seam mining face as the research object which was in Haizi Coal Mine of Huaibei Mining Group.It investigated rock distribution characteristics for roof and floor of the 7# protective seam,and the coal stress,displacement distribution law of the 9# protected seam.Based on these results,it analyzed the scope of protection for protective seam mining.The results showed that：under the condition of fully mining for No.762 protective seam mining face,through calculating the experimental results,it obtained that the effective pressure-relief protection angle was 78° and 79° under the up and down of verge direction,the max expansion rate of the 9# coal seam was 0.81%.
出处
《煤矿安全》
CAS
北大核心
2012年第12期32-36,共5页
Safety in Coal Mines
关键词
上保护层
卸压范围
相似模拟
upper protective seam
released range
similar simulation
