煤层底板地质构造影响下承压水的渗透路径演化规律

Evolution Law of Coal Seam Seepage Path of Floor Confined Water under Geological Structure

煤层底板承压水在复杂地质构造环境下的渗透路径难以预测。为探究隐伏断层影响下底板承压水的渗透路径的演化规律,以柳塔煤矿典型突水地质条件为例,建立了采场底板承压水与隐伏断层构造影响下的力学模型,推导了导水裂隙的起裂、抗渗透强度判据,运用MATLAB计算得出底板裂隙的演化路径。应用COMSOL软件进行数值验证,再现了底板承压水在隐伏断层影响下的渗透演化路径。结果表明:地下承压水的渗透路径会沿断层的反方向扩展,在进入采空区压实边界后迅速向上延伸。在工程上可以根据底板地质构造的赋存位置与规模,预测初始渗透裂隙,进行重点治理。

It is difficult to predict the seepage path of confined water of coal seam floor in complex geological structure environment.To explore the evolution law of seepage path of floor confined water under the influence of hidden faults,taking typical geological conditions of water inburst in Liuta coal mine as an example,the criterion of initiation and seepage strength of water-conducting crack is derived,and the mechanical model under the influence of confined water and hidden fault structure of stope floor is established.The evolution path of floor crack is obtained by using MATLAB calculation.COMSOL software is used for numerical verification,and the seepage evolution path of floor confined water under the influence of hidden faults is reproduced.The results show that the seepage path of underground confined water expands along the opposite direction of the fault and rapidly extends upward after entering the compaction boundary of the goaf.In engineering,the initial seepage cracks can be predicted according to the occurrence location and scale of the floor geological structure,and the key control can be carried out.