摘要
为了解决大埋深、高地应力条件下的底抽巷围岩控制困难而导致瓦斯抽采效率低的问题,以古汉山矿1605底抽巷为工程地质背景,对底抽巷现场持续变形破坏的特征进行深入研究,提出围岩综合性协同控制的对策,并应用于现场试验。研究结果表明,受高地应力和动压双重影响,造成围岩强度降低、蠕动扩容严重,无法满足支护要求,是底抽巷发生破坏的主要原因。采用强化围岩锚固系统承载性能、提高底角岩层稳定性、增加护表及局部注浆加固(或注浆锚索)等综合方法,对底抽巷进行协同控制。经现场试验,变形状况得到改善,瓦斯抽放孔采出率显著提高,可为类似地质条件下的底抽巷治理提供新思路和技术参考。
In order to solve the problem of low gas drainage efficiency caused by the difficulty in controlling the surrounding rock of the bottom drainage roadway under the conditions of large burial depth and high ground stress,taking the 1605 bottom drainage roadway of Guhanshan Mine as the engineering geological background,the characteristics of the continuous deformation and failure of the bottom drainage roadway on site were studied in depth,and the comprehensive coordinated control measures for surrounding rock were proposed and applied to the field test.The research results show that the main reason for the failure of the bottom extraction roadway is that the strength of the surrounding rock is reduced,the creep expansion is serious,and the support requirements cannot be met due to the dual effects of high ground stress and dynamic pressure.By adopting comprehensive methods such as strengthening the bearing capacity of the surrounding rock anchoring system,improving the stability of the bottom corner rock layer,adding protective surfaces,and local grouting reinforcement(or grouting anchor cables),collaborative control is carried out on the bottom extraction roadway.After on-site testing,the deformation condition has been improved,and the extraction rate of gas drainage holes has significantly increased.This can provide new ideas and technical references for the treatment of bottom drainage tunnels under similar geological conditions.
作者
孙伟
Sun Wei(Guhanshan Mine,Henan Coking Coal Energy Co.,Ltd.,Jiaozuo Henan 454000,China)
出处
《山西冶金》
CAS
2023年第6期220-224,共5页
Shanxi Metallurgy
关键词
高地应力
底抽巷
围岩控制
瓦斯抽采
注浆
协同控制
high ground stress
bottom extraction roadway
surrounding rock control
gas extraction
grouting
collaborative control
