推进速度对大采高综采面煤壁稳定性的影响

Influence of Mining Velocity on Stability of Coal Wall in Fully Mechanized Coal Face with High Cutting Heigh

煤壁片帮是制约大采高综采面安全开采的主要因素之一,严重的煤壁片帮导致架前大面积空顶,端面顶板冒顶几率增加。本文结合淮北某矿地质条件,应用FLAC3D数值模拟软件,分析了工作面推进速度对煤壁稳定性的影响。研究结果表明:工作面推进速度越慢,煤壁片帮及端面冒顶的几率越大;反之,则越小。工作面推进速度存在一个临界值,当低于此值时,工作面煤壁片帮及端面冒顶的几率大大增加。研究结果为现场施工的合理组织及安全生产提供了依据。

Rib fall of coal wall is one of the main restrictive factors for safe exploitation of fully mechanized top coal caving mining face with high cutting height. Serious rib fall of coal wall lead to large area of unsupported roof in front of hydraulic support, the probability of roof failure will increase. Based on the geological conditions in a coal mine of Huaibei coal - mining company, this paper analyzes influence of mining velocity on stability of coal wall through FLAC^3D establishment mining model. The analysis results showed that mining velocity is more slow, the prob-ability of roof failure and rib fall is more large. There is a critical value that when the mining velocity is lower than this value the probability of roof failure and rib fall Will increase. The result can provide basis for the site construction and safety in production.