七五煤业运输巷支护参数优化研究
Optimization of transportation roadway support parameters for Qiwu Coal Industry
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摘要: 为确定七五煤业23东翼采区运输巷支护参数，采用松动圈理论及悬吊理论计算得出巷道围岩具体支护参数，并通过数值模拟及现场实践进行了验证。结果表明，基于松动圈理论计算得出顶板松动圈的高度为Ls=3.44 m,两帮的松动圈为Le=2.69 m,而通过悬吊理论计算得出锚杆长度为3 200 mm、锚索长度为6 300 mm,均有效穿过巷道围岩松动圈范围。通过数值模拟得出，巷道采用该支护方式相较于巷道未施加任何支护形式，巷道水平围岩位移量减少45.67%,垂直位移量减少44.74%,巷道底板围岩塑性区破坏深度和面积基本未发生变化。通过现场监测得出，巷道两帮位移量>顶板位移量>底鼓量，其最大位移量分别达到143 mm、105 mm、22 mm,巷道围岩变形量较小，满足生产条件。Abstract: In order to determine the supporting parameters of transportation roadway in the 23 east wing mining area of Qiwu Coal Industry, the specific supporting parameters of the surrounding rock of the roadway were calculated by using loose circle theory and suspension theory, and verified by numerical simulation and field practice.The results show that: Based on the loose circle theory, the height of the roof loose circle is L</i>s=3.44 m, the loose circle of the two sides is Le=2.69 m, and the length of the anchor rod is 3 200 mm, and the length of the anchor cable is 6300mm, which can effectively pass through the range of the loose circle of the surrounding rock of the roadway.Through numerical simulation, compared with the roadway without any support form, the horizontal surrounding rock displacement of the roadway is reduced by 45.67%,the vertical displacement is reduced by 44.74%,and the failure depth and area of the plastic zone of the surrounding rock of the roadway floor are basically unchanged.Through on-site monitoring, the displacement of the two sides of the roadway>the displacement of the roof>the floor heave amount, the maximum displacement reaches 143 mm, 105 mm and 22 mm, respectively, and the deformation of the surrounding rock of the roadway is smaller, thus meeting conditions for production.
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