综采工作面周期来压步距受回采速率影响研究

Influence of mining rate on periodic weighting pace of fully mechanized coal mining face

为实现不同采煤速率条件下综采工作面周期来压步距的预测,保证来压时工作面稳定,以陕北某煤矿14204工作面为工程背景,通过对工作面支架压力实时监测得出矿压显现规律,并分别采用对数函数和双曲函数对周期来压步距受推采速率的影响进行回归分析。分析结果表明,14204工作面平均来压步距为13.3 m;经过对比分析,发现双曲函数能很好的拟合推采速率对周期来压步距的影响;随回采速率的提高周期来压步距有所增加,但是由于工作面两端及中间位置的顶板所处的边界条件、地质条件等不尽相同,所以周期来压步距增加的幅度有所差异。研究成果为陕北地区综采工作面矿压显现规律的预测及控制提供了有益的实践经验。

In order to realize the prediction of the periodic weighting pace of fully mechanized coal mining faceunder the condition of different mining rate so as to ensure the stability of working face, taking the working face14204 in a coal mine in Northern Shanxi as engineering background, the paper obtained the law of rock pressurebehavior through the real time monitoring of the pressure on the supports in working face, and then conducted regressionanalysis of the influence of the mining rate on the periodic weighting pace by using the logarithmic functionand the hyperbolic function. The results show that the average pressure step in working face 14204 was 13.3 m.Through the comparative analysis it was found that the hyperbolic function could fit well the influence of miningrate on the periodic weighting pace. The periodic weighting pace increased with the mining rate, but due to thedifference of the boundary and geological conditions of roof at two ends and the middle of working face, the increaseamplitude was different. The research results can provide useful practical experiences for the prediction andcontrol of the mining pressure behavior in the fully mechanized coal mining face in Northern Shanxi.