亭南煤矿软岩巷道底臌机理及控制对策研究

 摘要：亭南煤矿软岩巷道底臌剧烈，最大底臌量达500mm，严重影响巷道的正常使用。本文运用工程地质学、软岩工程力学等多学科理论，采用现场工程地质条件分析、室内实验与理论分析相结合的方法，以西翼轨道大巷为例，对软岩巷道底臌变形机理及破坏过程进行了深入研究。结果表明，水平构造应力和膨胀性粘土矿物吸水膨胀是巷道底臌的主要原因，变形机理是塑性挤出型和膨胀型综合作用的复合型底臌，提出了反底拱+底角锚杆耦合支护技术结合防治水措施的底臌控制对策。现场应用效果良好，有效控制了巷道底臌。

Mechanism and Support Technology of Floor Heave in Soft-rock Roadway in Tingnan Coal Mine

Abstract: Serious floor heave had occurred of the west track roadway in Tingnan Coal Mine. The maximum value of floor heave arrived to 50 cm, which impacted the normal application of roadway severely. The article involved engineering geology and soft rock engineering mechanics etc, employed the ways of study on engineering geomechanics, laboratory testing, and deeply researched the deformation mechanism and generating process of floor heave, it shows clearly that the major influencing factor that led to floor heave is the horizontal extrusion stress, then floor surrounding rock with high content of swelling clay minerals and soaking effect on floor rock, so the deformation mechanism is compound type of floor heave caused by the combined action of plastic extrusion and swelling. Aimed at the above-mentioned mechanism, provided the new support measures with inverted arch and floor bolt to control the floor heave. Project protice has shown good results of new supporting have been obtained with expected effects, and controlled the floor heave effectively.