In the mining process of coal mine,waterproof coal pillars should be set between the weathered oxidation zone and the first mining face.In order to determine the reasonable upper limit of the first mining face of Hong...In the mining process of coal mine,waterproof coal pillars should be set between the weathered oxidation zone and the first mining face.In order to determine the reasonable upper limit of the first mining face of Hongyi Coal Mine,the waterproof coal pillar needs to be wide enough to resist the lateral hydrostatic pressure of the oxidation zone,and to ensure that the top plate aquifer does not run through the water guide crack zone,while also liberating as much stagnant coal as possible.In this paper,the first coal mine face’s waterproof coal pillar was calculated using conventional and optimized calculation methods,taking into account the dip angle of the coal seam,the height of the water-guide crack zone,and the rock shift influence zone,and finally the upper limit of the first face of Hongyi Coal Mine was determined.展开更多
基金the Open Fund of State Key Laboratory of Water Resource Protection and Utilization in Coal Mining(Grant No.GJNY-18-73.15)the National Natural Science Foundation of China(NSFC)under grant No.41602254+2 种基金the National Natural Science Foundation of China(NSFC)under grant No.41807221the Science and Technology Innovation Project of Northwest A&F University,the Double-Class Discipline Group Dry Area Hydrology and Water Resources Regulation Research funding project(Z102022011)the Special Funding Project for Basic Scientific Research Business Fees of Central Universities(2452016179).
文摘In the mining process of coal mine,waterproof coal pillars should be set between the weathered oxidation zone and the first mining face.In order to determine the reasonable upper limit of the first mining face of Hongyi Coal Mine,the waterproof coal pillar needs to be wide enough to resist the lateral hydrostatic pressure of the oxidation zone,and to ensure that the top plate aquifer does not run through the water guide crack zone,while also liberating as much stagnant coal as possible.In this paper,the first coal mine face’s waterproof coal pillar was calculated using conventional and optimized calculation methods,taking into account the dip angle of the coal seam,the height of the water-guide crack zone,and the rock shift influence zone,and finally the upper limit of the first face of Hongyi Coal Mine was determined.
文摘针对龙口海域下开采的实际情况,分析了海域扩大区水文地质条件,收集整理国内13个矿区综放开采导水裂缝带高度实测数据,选取采厚、基岩柱厚度、倾角、顶板单轴抗压强度、泥岩比例和覆岩结构6种因素作为导水裂缝带发育高度预测模型的影响因子,建立导水裂缝带高度预测模型,并对不同采厚条件下导水裂缝带高度进行了预测;应用FLAC软件进行了断层条件下覆岩破坏规律的模拟,计算了不同落差、不同倾角的正断层对导水裂缝带发育高度的影响,得出在软弱覆岩类型综采工作面（采厚4.4 m）有正断层（倾角45-65°）、落差小于6.0 m的情况下,导水裂缝带发育高度较之正常地质条件下增大14.4%-22.2%.提出了综合考虑断层和正常条件的防水安全煤岩柱设计,确定在海域放顶煤开采正常覆岩条件下防水安全煤岩柱厚度为55.5 m;受断层影响条件下,防水煤岩柱厚度为62.5 m.
