Schoal of Resources and Safety Engineering, China University of Mining and Technology (eiing) Yuwu Coal
Mining Company Limited, Lu'an Group School of Mechanics and Architectural Engineering, China University of
Mining and Technology (Beiing)

为提高厚煤层综放工作面开采效率,运用相似模拟、数值分析和现场监测等手段,分析综放高强度开采工作面所面临的矿压显现明显、巷道底鼓严重等机理,针对其上覆岩层顶板破坏特征及煤岩层活动规律,对矿压显现特征、巷道底鼓变形特点等进行研究,结果表明:两侧采动影响下回采巷道底板岩层存在零位移等值线和零应变等值线,并确定了底板零位移点、零应变点最大深度分别为1.9、3.4 m。由此提出综放高强度开采巷道底鼓控制关键技术,,即:首先通过对穿锚索、补打高强让压锚杆等措施加强两帮支护,其次采用长2.4 m的水力膨胀锚杆将锚杆锚固端深入底板拉应变压缩区,通过锚杆的主动锚固力与锚固端围岩向下压缩施加给锚杆的附加锚固力,增大底板岩层抗弯刚度限制底鼓,同时将底板底角处锚杆布置为45°倾角,限制该范围内高剪切应力作用。

In order to improve mining efficiency of a fully- mechanized top coal caving mining face in thick seam, the similar simulation, numerical analysis, site mo nitoring and measuring and other means were applied to analyze obvious mine strata pressure behavior, serious gateway floor heave and other mechanism faced by a high intensity mining of a fully- mechanized top coal caving mining face. According to the roof failure features of the overburden strata and the coal and rock movement law, a study was conducted on the mine strata pressure behavior features, gateway floor heave deformation features and others. The results showed that under the min ing influences of the gateway two sidewall, the floor strata of the mining gateway had a zero displacement isoline and a zero strain isoline, the max depth of the zero di splacement point in the floor was determined as 1. 9 m and the max depth of the zero strain point was 3. 4 m. Thus the key technology of the gateway floor heave contr ol for the high intensity mining of the fully- mechanized top coal caving mining face was provided. The key technology would apply through anchors, additional high stre ngth yield bolts and others to enhance the support of the two sidewalls and apply a2. 4 m long hydraulic swelling bolt to fix a bolt end in a tensile strain compressed zon e of floor. An active anchoring force of the bolt and an additional anchoring force of the bolt provided by the downward compression of the surrounding rock at the anch oring end were applied to increase a flexural rigidity of the floor strata and to limit the floor heave. Meanwhile, the bolt at the floor corner of the floor should be set with a 45° angle to limit a high shearing stress role within the scope.

国家重点基础研究发展计划(973计划)资助项目(2010CB226801,2010CB226804)；国家自然科学基金资助项目(51174213)；新世纪优秀人才支持计划资助项目(NCET-10-0775)；中央高校基本科研业务费专项资金资助项目(2009QM001)；