柔模混凝土墙沿空留巷围岩稳定机理及控制技术研究
Study on stability mechanism and control techniques of surrounding rock in gob-side entry retaining with flexible formwork concrete wall
陈定超 1王襄禹 1吴帅 2张飞腾 1樊在壮 2王祥东 1李梦龙1
作者信息
- 1. School of Mine,China University of Mining and Technology,Xuzhou 221116,China
- 2. Daliuta Coal Mine,CHN Energy Shendong Coal Group,Shenmu 719315,China
- 折叠
摘要
沿空留巷是无煤柱开采中的一种技术,是沿采空区边缘维护原回采巷道,并将其保留作为下个工作面的一条回采巷道使用,具有煤炭采出率高、巷道维护费用低等优点.本文以大柳塔煤矿52605工作面沿空留巷为工程背景,介绍了一种柔模混凝土墙沿空留巷的创新技术.为了验证该技术的可行性,本文根据现场地质条件建立了数值计算模型,并研究了工作面回采过程中沿空留巷围岩的稳定机理.数值模拟结果显示:工作面回采期间,巷旁充填体逐渐承载,围岩应力峰值由回采侧向实煤体侧转移,顶板和实煤体侧塑性区明显增大,发生拉剪混合破坏.基于工作面回采期间沿空留巷围岩的应力和塑性区演化特征,提出了围岩控制技术并成功开展了工业性实验.现场监测结果显示,巷道围岩变形控制效果良好,工作面无明显压力显现.
Abstract
Gob-side entry retaining(GER)is a technique in non-pillar mining,which maintains the original mining roadway along the edge of gob and retains it as a mining roadway for the subsequent working face.This technique offers significant advantages such as a high coal mining rate and cost-effective roadway retention.This paper focus on the GER implementation in 52605 panel of Daliuta Coal Mine and introduce an innovative technique involving the utilization of flexible formwork concrete wall(FFCW).To verify the feasibility of this technique,a numerical model was established.Furthermore,the stability mechanism of surrounding rock during the mining process of 52605 panel was thoroughly examined.Simulation results indicate that during the mining,the roadside backfill body(RBB)gradually bears load,causing peak stress transfer from gob side towards solid coal side.Moreover,plastic zone of roof and solid coal exhibited a noticeable increase,leading to a combined tensile-shear failure.Based on the stress and plastic zone evolution characteristics of surrounding rock during the mining process of the working face,control techniques were proposed and industrial experiment was successfully carried out.Ultimately,on-site monitoring results show that the deformation control effect of surrounding rock was good,and there was no obvious pressure manifestation in the working face.
关键词
沿空留巷/柔模混凝土墙/挡矸支架/控制技术/数值模拟Key words
gob-side entry retaining/flexible formwork concrete wall/gangue retaining bracket/control technique/numerical modeling引用本文复制引用
基金项目
National Natural Science Foundation of China(52174132)
National Key Research and Development Program of China(2020YFB1314204)
出版年
2023
NETL
NSTL
维普
万方数据