基于松动圈理论的破碎软岩巷道支护研究与应用

Research and Application on Support of Broken and Soft-rock Drift Based on Loose Circle Theory

首旺煤矿综采工作面回采巷道顶板破碎,围岩软弱,变形量较大。基于围岩松动圈理论,对首旺煤矿回采巷道的破碎机理和围岩变形机制进行分析,并根据围岩松动圈支护理论,确定锚杆支护的具体参数,设计采用锚杆+注浆联合支护来控制巷道的破坏变形。基于数值模拟结果,对支护后工作面回采巷道的屈服破坏特征、巷道围岩垂直应力、巷道围岩位移特征进行了分析。现场工业试验表明,采用锚杆+注浆联合支护技术后,巷道顶底板移近量和两帮移近量明显降低,巷道完整稳定,可以很好的控制破碎软岩巷道变形,提高巷道的整体稳定性。

The mining drift of fully-mechanized face has the characteristics of broken roof,soft rock and large deformation in Shouwang coal mine.The deformation mechanism of surrounding rock and the crushing mechanism in this drift were analyzed.According to the loose circle theory of surrounding rock,the concrete parameters of bolting support were determined,and the support method combining bolting and grouting was designed to control the failure strain of drift.Based on the results of numerical simulation,three characteristics of drift in working face after supporting were analyzed,containing the yield failure characteristic,the vertical stress of surrounding rock and the displacement characteristic of surrounding rock. The industrial field tests showed that the deformations around drift decreased significantly and the drift was complete and stable after using this support method,which could effectively control the deformation of broken and soft-rock drift and improve the overall stability of drift.