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受地质条件、巷道断面形状等因素影响,回采巷道围岩松动圈发育具有非均衡性和不确定性,所以,如何精确得到松动圈厚度是回采巷道松动圈支护的关键问题。本文结合现场实测与数值模拟方法,研究了回采巷道围岩破坏形态及支护方案。首先,利用地质雷达对3条回采巷道两帮及顶板围岩松动圈范围进行了现场测试;其次,采用3DEC软件,对围岩破坏塑性区及变形进行模拟计算。研究结果表明,3条回采巷道围岩破坏范围属于大松动圈,并综合现场测试与数值模拟结果,绘制了松动圈范围图。最后,对原有支护方案进行了优化,结果表明优化的支护方案有效地减小了巷道围岩塑性区厚度及表面变形量,为回采巷道支护提供了参考。
Affected by the geological conditions and the cross-sectional shape of the roadway, the development of loose ring in surrounding rock of mining gateway has imbalance and uncertainty. Therefore, how to get the loose ring thickness accurately is the key issue of loose ring supporting in mining gateway. In this paper, field test and numerical simulation methods are used to study the failure modes and supporting schemes of surrounding rock in mining gateway. First of all, the field test of the two moving tunnels and the surrounding rock loose circle of the three mining tunnels was carried out by using the GPR. Secondly, 3DEC software was used to simulate the plastic zone and the deformation of the surrounding rock failure. The research results show that the failure range of the surrounding rock of the three mining roadways belongs to the big loose moving circle. Based on the field test and numerical simulation results, the range diagram of the loose moving circle is drawn. Finally, the original support scheme is optimized. The results show that the optimized support scheme can effectively reduce the plastic zone thickness and surface deformation of the surrounding rock of the roadway, and provide a reference for the mining roadway support.