防水煤柱安全评价的流-固耦合分析

Fluid-Solid coupling analysis of the safety of the waterproof coal pillar

应用流-固耦合分析,对防水安全煤柱进行安全评价。采用有限差分分析软件FLAC3D,分析了不考虑流-固耦合与考虑流-固耦合两种情况下,某煤矿四采二层煤安全防水煤柱的稳定性及防溃水能力。比较二者的计算结果发现:考虑流-固耦合与不考虑流-固耦合时的计算结果中,塑性区都呈现出两端高、中间低的"马鞍"形状,但考虑耦合时塑性区的范围比较大;考虑流-固耦合作用时,可以模拟底板的受力状态与变形破坏规律;在合理防水安全煤柱留设分析中,考虑流-固耦合是必要的;采用流-固耦合分析可以得出,实例中最小防水安全煤柱的长度不应小于28m。分析表明,对防水煤柱的安全性进行流-固耦合分析,是一种更接近于实际情况的、更有效的分析方法。

The paper analyzes the stability and anti-water-inrush ability of the waterproof security coal pillar of a certain mine respectively considering fluid-solid coupling and without coupling through FLAC^3D. The comparison between both computation results shows that plastic zones in both cases take on a ＂saddle＂ shape which is high at both ends and low in the middle, but the plastic zone is larger in the coupling analysis. The stress state and deformation and failure law of the bottom floor can be simulated in the coupling analysis. It is necessary to consider fluid-solid coupling in the example and the computed minimum length of waterproof coal pillar shall not be shorter than 28 meters. The results indicate that fluid-solid coupling analysis of the waterproof coal pillar is more truthful and effective.