工作面过煤柱强矿压显现机理及地面压裂控制研究  

Study on the mechanism of strong strata behavior influenced by overlying coal pillar and control technology of ground fracturing

作　　者：高瑞[1] 于斌[1,2] 孟祥斌[2] GAO Rui1, YU Bin1＇2, MENG Xiangbin2(1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education, School of Mines China University of Mining ＆ Technology, Xuzhou, Jiangsu 221116, China; 2. Datong Coal Mine Group Co Ltd, Datong, Shanxi 037003, Chin)

机构地区：[1]中国矿业大学深部煤炭资源开采教育部重点实验室,矿业工程学院,江苏徐州221116 [2]大同煤矿集团有限责任公司,山西大同037003

出　　处：《采矿与安全工程学报》2018年第2期324-331,共8页Journal of Mining & Safety Engineering

基　　金：国家重点研发计划项目(2016YFC0600701)：三晋学者支持计划专项经费项目(2050205)

摘　　要：针对特厚煤层工作面受远场上覆煤柱大结构影响的强矿压显现机理及控制难题,综合采用现场实测和数值模拟的研究方法,对工作面强矿压显现特征及机理进行研究,提出并实施了地面压裂控制强矿压的技术。现场实测表明,3-5#特厚煤层开采后覆岩破断发展至上覆侏罗系煤柱位置,造成煤柱大结构破坏,数值计算表明,煤柱集中应力致使下伏相邻硬厚岩层整体性的切落失稳是造成工作面强矿压显现的主要原因。据此,提出基于地面水力压裂高位硬厚岩层的采场矿压控制技术手段。实践表明,地面压裂扩展半径大,工作面来压强度明显降低,压裂效果显著,表明地面压裂是实现强矿压控制的有效创新手段。Aiming at the difficulty in controlling the strong strata behavior at the working face affected by overlying coal pillar, this paper studies the mechanism and characteristic of strong strata behavior and then proposes a ground fracturing method to relieve the high pressure after doing field test and numerical simulation. Field measurements showed that the fracture zone would develop to overlying Jurassic coal seam which in turn would cause strong strata behavior to the 3-5# coal seam. The numerical calculation also presented that the breakage of adjacent hard thick strata influenced by the concentrated stress from overlying coal pillar is the main reason of strong strata behavior at lower-level working face. In this condition, the technical of ground hydraulic fracturing is proposed, the practice indicated that the larger the fracturing radius is, the less strata behavior the workface would experience. The research results indicated that the ground fracturing is an effective innovative means to relieve the strong strata behavior.

关 键 词：特厚煤层 上覆煤柱 强矿压 地面压裂 裂缝扩展 

分 类 号：TD325[矿业工程—矿井建设]