近距离煤层采空区下巷道围岩松动圈分析及支护技术研究

Analysis of surrounding rock loose ring and research on supporting technology in goaf of coal seam

为保证属于近距离煤层采空区下巷道的23305下工作面回风巷围岩的稳定,通过回风巷围岩松动圈测试对围岩松动圈的厚度进行分析,结合3#煤层底板破坏深度分析对回风巷的支护方案进行具体设计,并进行矿压监测。结果表明:支护方案实施后,巷道顶底板的最大移近量为42mm,两帮最大移近量为68mm,保障了巷道围岩的稳定。

In order to ensure the stability of the surrounding rock of the return air roadway at the lower face 23305 which belongs to the close goaf of the coal seam, the thickness of the surrounding rock loose ring of the return air roadway was analyzed through the test of the surrounding rock loose ring of the return air roadway, and the support scheme of the return air roadway was specifically designed and the mine pressure was monitored by combining the analysis of the failure depth of no.3 coal seam floor. The results show that after the implementation of the support scheme, the maximum displacement of the roof and floor of the roadway is 42 mm, and the maximum displacement of the two sides is 68 mm, which ensures the stability of the roadway surrounding rock.