摘要
针对李家楼煤业综采工作面煤柱尺寸留设大及巷道变形严重问题,采用数值模拟与现场监测相结合的方法,系统研究了1206工作面小煤柱切顶卸压护巷技术可行性。结果表明:对1206回风顺槽实施切顶后,侧向支承应力由切顶前17.21 MPa降至12.03 MPa,在0~25 m范围内的支承应力降幅明显,切顶可取得明显的卸压效果;相较于8 m煤柱宽度,10 m煤柱宽度与12 m煤柱宽度条件下,煤柱弹性区面积大于50%,巷道整体变形较小,考虑煤柱稳定及煤炭资源高效回收需要,确定合理煤柱宽度为10 m。在此基础上,研究提出小煤柱超前深孔预裂爆破切顶,以及巷道“锚杆+金属网+W钢带+钢筋梯子梁锚索”补强支护方法。通过现场实践,巷道顶板及底板变形量分别降低35.4%与43.1%,巷道煤柱帮与回采帮变形量分别降低30.4%与40.3%,巷道整体变形得到有效控制,实现了工作面安全高效开采。
Aiming at the problems of large coal pillar size reservation and severe roadway deformation in the fully mechanized mining face of Lijialou Coal Industry,the feasibility of small coal pillar roof cutting pressure relief and roadway protection technology in the 1206 working face is systematically studied using a combination of numerical simulation and on-site monitoring.The results show that after the roof cutting of the 1206 return air channel,the lateral abutment stress decreases from 17.21 MPa before the top cutting to 12.03 MPa,and the abutment stress decreases significantly within the range of 0-25 m.The roof cutting can achieve significant pressure relief effect;Compared to the 8 m coal pillar width,under the conditions of 10 m coal pillar width and 12 m coal pillar width,the elastic zone area of the coal pillar is greater than 50%,and the overall deformation of the roadway is relatively small.Considering the stability of the coal pillar and the need for efficient coal resource recovery,a reasonable coal pillar width of 10 m is determined.On this basis,the small coal pillar advanced deep hole pre-splitting blasting and roof cutting,as well as the reinforcement support method of"anchor rod+metal mesh+W steel strip+steel ladder beam anchor cable"in the roadway,are stuied and proposed.Through on-site practice,the deformation amount of the roadway roof and floor are reduced by 35.4% and 43.1%,respectively.The deformation amount of the roadway coal pillar side and mining side is reduced by 30.4% and 40.3%,respectively.The overall deformation of the roadway is effectively controlled,achieving safe and efficient mining of the working face.
作者
高飞
Gao Fei(Taiyuan Dongshan Lijialou Coal Industry Co.,Ltd.,Shanxi Taiyuan 030400)
出处
《山东煤炭科技》
2023年第12期32-36,共5页
Shandong Coal Science and Technology
关键词
综采
小煤柱
切顶
爆破
fully mechanized mining
small coal pillar
roof cutting
blasting
