下保护层开采覆岩移动规律研究  

Research on Overlying Strata Movement of Lower Protective Seam Mining

作　　者：卫成相 WEI Chengxiang(Chengzhuang Mine of Jincheng Coal Mining Group,Jincheng 048021,China)

机构地区：[1]晋城煤业集团成庄矿,山西晋城048021

出　　处：《煤矿安全》2018年第9期79-82,共4页Safety in Coal Mines

基　　金：国家自然科学基金面上资助项目(51274088)

摘　　要：为研究下保护层开采覆岩移动特征和运动剧烈程度对上方被保护层的卸压效果的影响。以寺河二号井为试验矿井,对其覆岩直接顶、基本顶、坚硬岩层的沉降规律进行现场测试和力学模型分析。结果表明:直接顶在工作面后方发生垮落,且下部先垮落、上部垮落滞后的分层垮落形式;主关键层的沉降规律与基本顶岩层类似,但沉降量和沉降的剧烈程度小于下部岩层,且主关键层内部没有发生离层或裂隙,而是表现为整层协调沉降;基本顶的运动分为3个阶段,且监测钻孔距采煤工作面越远,沉降值越大;随着距离采场顶板高度的增加,受采动影响的剧烈程度也在逐渐减小。In order to study the influence of the overlying strata movement characteristics and the intensity of movement on the pressure relief effect of the overlying protected strata. Taking Sihe No.2 well as the experimental mine, field test and mechanical model analysis of the settlement patterns of immediate roof, basic roof and hard rock stratum of the overlying strata were carried out. The results show that： the vertical roof caving occurs behind the working face, and the lower part caving first and the upper part caving lagging; the main key stratum is similar to the basic roof rock stratum, however, the settlement amount and settlement intensity are smaller than that of the lower strata, and no stratification or fracture occurs inside the main stratum. It is the whole layer of settlement; the movement of the basic roof is divided into three stages, and the farther the monitoring borehole is from the coal working face, the larger the settlement value; with the increase distance of roof height from the stope, the intensity affected by stope is also decreasing.

关 键 词：采矿工程 保护层开采 深部基点法 移动规律 下保护层 

分 类 号：TD325[矿业工程—矿井建设]