倾斜煤层含矸煤柱区应力状态及防冲技术研究  

Research on stress state and rock burst prevention technology in gangue-bearing pillar area of inclined coal seam

作　　者：吴学松 曹安业[1] 买巧利[3] 王崧玮 陆祖军 WU Xuesong;CAO Anye;MAI Qiaoli;WANG Songwei;LU Zujun(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;Yanbei Coal Mine,Huating Coal Group Co.Ltd,Huating 744100,China;Huating Coal Mine,Huating Coal Group Co.Ltd,Huating 744100,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]华亭煤业集团砚北煤矿,甘肃华亭744100 [3]华亭煤业集团华亭煤矿,甘肃华亭744100

出　　处：《山东科技大学学报（自然科学版）》2023年第2期44-52,共9页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51734009)。

摘　　要：针对倾斜煤层分层开采综放工作面临空侧含夹矸层巷道变形量大、冲击危险性高的问题,构建了侧向悬顶临空煤柱受力模型,运用数值模拟方法对工作面回采过程中煤柱区域围岩应力场和塑性区变化进行研究。研究结果表明:在煤柱弹性变形阶段,煤柱支撑力、变形量、煤柱积聚弹性能随着悬顶长度的增大而增大;临空煤柱在巷道区域存在夹矸弱层时,沿夹矸面产生的应力集中区致使巷道变形量增大,诱使周围煤岩运动加剧;当临空侧煤柱上方巷道顶板不易发生破坏时,可形成弹性能的良好载体和传递通道,造成巷道应力集中,加剧冲击地压发生危险性。同时,针对含矸临空煤柱自身抗破坏能力较差问题,提出远近结合、分批次的卸压方式,制定了顶板预裂、煤体爆破方案,有效降低巷道帮鼓变形量,微震震动点向远离工作面方向上方顶板偏移,冲击地压危险程度明显降低,有效保证工作面安全回采。To solve the problems of large deformation and high rock burst risk of goaf side roadway containing gangue layer in fully mechanized top coal caving mining of inclined coal seams,this paper constructed a mechanical model of coal pillar at the side of the lateral overhanging roof to study the variations of the stress field and plastic zone of surrounding rock in coal pillar area during mining by numerical simulation.The results show that in the elastic deformation stage of the coal pillar,the support force,deformation,and accumulated elastic energy of the coal pillar increase with the increase of the suspended roof length.When there is a weak gangue layer in the coal pillar at the goaf side in the roadway area,the stress concentration zone along the gangue surface is generated,which can aggravate the deformation of the roadway and the movement of surrounding coal rock.When the roadway roof above the coal pillar on the side of the goaf is not easily damaged,a suitable carrier and transfer channel of elastic energy can be formed,resulting in the concentration of roadway stress,and increasing the risk of rock burst.In view of the poor anti-damage ability of the coal pillar at the goaf side containing gangue,a pressure relief method,which can relieve the near and far pressure in batches,was put forward.Then,schemes for roof pre-cracking and coal blasting were formulated,which could effectively reduce the deformation of roadway walls and shift the micro-seismic vibration point to the upper roof far away from the working face.The proposed method can significantly reduce the danger degree of rock burst and effectively ensure the safe mining of the working face.

关 键 词：倾斜煤层 临空煤柱 夹矸弱层 卸压技术 数值模拟 

分 类 号：TD324[矿业工程—矿井建设]