基于煤岩应力监测的深井沿空掘巷煤柱宽留设研究

发布时间：2018-03-07 08:08

本文选题：深部矿井　切入点：沿空掘巷　出处：《煤炭科学技术》2017年08期 　论文类型：期刊论文

【摘要】：为确定合理的区段小煤柱宽度,保证深部矿井沿空巷道的稳定性和实现工作面安全回采,以高家堡煤矿101工作面为例,采用钻孔应力监测方法,对101工作面推过前后的侧向煤体应力分布特征进行了实测研究,为沿空掘巷小煤柱留设提供实测资料。研究结果表明:工作面侧向煤体应力峰值至煤壁13~17 m,至煤壁9 m之内属于应力降低区,在该范围区内沿空掘巷,可避免受较高支承压力的影响,有利于巷道维护。在此基础上,采用数值模拟方法,优化分析得到103工作面沿空掘巷小煤柱合理宽度为6~7 m,103回风巷(沿空掘巷)实际小煤柱宽度为7 m,通过对103沿空巷道围岩变形及锚杆锚固力现场监测,表明巷道围岩变形量不大,顶板、小煤柱帮及工作面帮巷道最大变形量分别为112、88、75 mm,锚杆锚固力变化相对较小,巷道维护状况较好,能够满足工作面安全回采。
[Abstract]:In order to determine the reasonable width of small coal pillar in section, to ensure the stability of roadway along the goaf in deep mine and to realize the safe mining of coal face, taking the 101 face of Gaojiapu Coal Mine as an example, the method of borehole stress monitoring is adopted. The characteristics of lateral coal stress distribution in 101 face before and after pushing are studied in this paper. The research results show that the peak value of the lateral coal stress in the face reaches 1317 m in the coal wall, and it belongs to the reduced stress area within 9 m of the coal wall, in which the roadway is driven along the goaf. It can avoid the influence of high supporting pressure and is beneficial to roadway maintenance. On this basis, the numerical simulation method is adopted. The optimum analysis shows that the reasonable width of the small pillar is 6 ~ 7 m and the actual width of the small pillar is 7 m. Through monitoring the surrounding rock deformation and anchor force of the 103 gob roadway, the optimum analysis results are as follows: (1) the reasonable width of the coal pillar is 6 ~ 7 m and the actual width of the coal pillar is 7 m in the return air roadway along the goaf. The results show that the maximum deformation of roadway surrounding rock is not large, the maximum deformation of roof, small coal pillar and working face is 1128875mm, the change of anchor force is relatively small, and the condition of roadway maintenance is better, which can meet the safety of mining face.
【作者单位】：陕西正通煤业有限责任公司;山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地;
【分类号】：TD822.3

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