摘要
为实现平煤股份四矿己16.17-23140机巷在上覆采空区破碎顶板条件下全锚支护成功,分析了巷道应力情况,确定了巷道存在应力降低区和应力集中区。按照模糊综合评判,确定了该巷围岩稳定性在应力降低区为Ⅳ类不稳定,在应力集中区为Ⅴ类极不稳定。按照工程类比法确定了相应的支护形式和参数;根据巷道层间距变化和应力集中情况,采用了3种支护设计方案;围岩监测变形结果表明,巷道两帮位移量及顶板下沉量满足安全要求。该项技术解决了四矿近距离下分层不稳定顶板巷道全锚支护难题。
In order to realize the cable anchor support technology at No.4 coal mine Ji16.17-23140 belt under goaf, the roadway stress was analyzed and the stress decreasing zone and stress increasing zone was determined. According to fuzzy clustering analysis, the surrounding rock of stress decreasing zone and stress increasing zone were respectively classified as the Ⅳ type unstable surrounding rock and Ⅴtype extremely unstable surrounding rock. Then, the support parameter of roadway was determined by engineering analogy, and three experimental schemes were finally implemented in site. The surrounding rock monitoring results showed that the maximum value of roof separation and two sides convergence both were lower than the alarm values, proving that the cable anchor support technology was effective and successful.
出处
《煤炭技术》
北大核心
2017年第8期18-20,共3页
Coal Technology
关键词
采空区
破碎顶板
应力集中区
全锚支护
mined out area
broken roof
stress increasing zone
cable anchor support
