沙曲矿巷道底鼓原因与形成机理分析

Analysis on Floor Heave Cause and Formation Mechanism of Mine Roadway in Shaqu Mine

为了解决沙曲矿巷道底鼓问题,为后期巷道支护提供指导和借鉴,深入分析了沙曲矿巷道底鼓的原因和产生的机理。从开采深度、底板围岩的强度和性质、水理作用、采动压力等方面分析了导致沙曲矿巷道底鼓产生的主要原因,并根据巷道两侧应力分布特点构建力学模型,探讨巷道底鼓产生的力学机理。研究结果表明,巷道埋深,围岩的非均质、非连续、流固耦合特性以及所处应力环境的复杂性都是导致该矿巷道底鼓产生的原因。底板岩体的承载力是决定巷道是否发生底鼓的主要因素,其大小取决于底板岩体的黏聚力、内摩擦角、容重;巷道发生底鼓时,其膨胀位移与底板围岩的黏聚力、内摩擦角呈反比,与渗水半径呈正比。

In order to solve the floor heave of the mine roadway in Shaqu Mine and to provide the guidance and references for the support of the mine roadway later, the paper had a deep analysis on the floor heave cause and formation mechanism of the mine roadway in Shaqu Mine. From the mining depth, the strength and properties of the floor and surrounding rock, the hydrological effects, mining pressure and others, the main causes to occur the floor heave in the mine roadway of Shaqu Mine were analyzed. According to the mechanics model established with the stress distribution features of the two sides along the mine roadway, the mechanics mechanism to occur the floor heave of the mine roadway was discussed. The research results showed that the depth of the mine roadway, the non-homogeneity, discontinued, fluid-solid coupling features of the surrounding rocks, as well as the complexity of the stress environment would all be the causes to occur the floor heave of the mine roadway. The bearing capacity of the floor strata would be the main factors to determine the mine roadway suffer the floor heave or not. The bearing capacity of the floor strata would be depend on the cohesive force, inner frictional angle and unit weight of the floor strata. When the floor heave caused in the mine roadway, the floor swelling displacement would be inverse proportion to the floor surrounding rocks in the cohesive force, and inner frictional angle and would be direct proportion to the radius of the water seepage.