旧采区二次掘进巷道围岩控制机理研究

发布时间：2018-03-07 08:14

本文选题：旧采残煤　切入点：围岩控制　出处：《太原理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文以山西晋煤集团泽州天安圣华煤业有限公司的3号煤层旧采残煤为背景，研究分析旧采区二次掘进巷道围岩控制技术。根据现场钻孔顶板取样并进行岩性力学分析以及现场实地勘察分析，得出了旧采区巷道的现状，和旧采区二次掘进巷道尺寸等相关参数，以及二次掘进时的巷道穿越情况。依据工程类比法，及工程经验，，选定锚杆支护方案。通过RFPA软件数值模拟二次掘进巷道通过空巷、空区、冒落区时，顶板在不同的锚杆支护方案下的支护效果，得出以下结论：（1）实体煤中掘进巷道与旧采区二次巷道掘进穿越空巷对比，实体煤中掘进时，巷道破坏程度小于旧采区二次巷道掘进穿越空巷。旧采区二次掘进无支护巷道穿越空巷、空区、冒落区时，顶板局部破坏严重，存在冒顶的隐患，都需要进行支护。（2）旧采区二次掘进巷道穿越空巷时，影响顶板支护效果的因素由大到小依次是锚杆强度、锚杆间距、锚杆长度。支护方案选用锚杆强度600MPa，锚杆长度2.0m，锚杆间距600mm的支护方案组合最为合理，对顶板控制效果较好。（3）旧采区二次掘进巷道穿越空区时，影响顶板支护效果的因素由大到小依次是锚杆强度、锚杆长度、锚杆间距。旧采区二次掘进巷道穿越空区时，支护方案选用锚杆强度500MPa，锚杆长度2.0m，锚杆间距800mm的支护方案组合最为合理，对顶板控制效果较好。（4）旧采区二次掘进巷道穿越冒落区时，影响顶板支护效果的因素由大到小依次是锚杆强度、锚杆长度、锚杆间距，但锚杆长度和锚杆间距对支护效果的影响几乎相同。旧采区二次掘进巷道穿越冒落区时，支护方案选用锚杆强度500MPa，锚杆长度2.0m，锚杆间距800mm的支护方案组合最为合理，对顶板控制效果较好。
[Abstract]:The background of this paper is the old mining residual coal in No. 3 coal seam of Shanxi Jin Coal Group, Zezhou Tianan Shenghua Coal Industry Co., Ltd. This paper studies and analyzes the control technology of surrounding rock in the roadway of secondary excavation in the old mining area. According to the sampling of the roof of the borehole on the spot and the analysis of rock mechanics and field investigation, the present situation of the roadway in the old mining area is obtained. According to the engineering analogy method and engineering experience, the bolting support scheme is selected, and the numerical simulation of the secondary tunneling roadway through the empty roadway is carried out by RFPA software, and the relevant parameters such as the size of the roadway in the old mining area, and the tunnel traversing during the secondary excavation, are selected according to the engineering analogy method and the engineering experience. The effect of roof support under different bolting schemes is obtained when there is a caving area. The following conclusions are obtained:. Compared with the second tunneling in the old mining area, the damage degree of the roadway in the solid coal is less than that in the old coal mining area, which is less than that in the old mining area, and the second excavation in the old mining area passes through the empty roadway without support. In the caving area, the local damage of roof is serious, and the hidden danger of roof fall needs to be supported. 2) when the roadway passes through the empty roadway in the old mining area, the factors influencing the roof support effect are the strength of the anchor rod, the spacing of the bolt, the order of the factors that affect the effect of roof support. The combination of bolting strength 600MPa, bolt length 2.0m, bolt spacing 600mm is the most reasonable, and the effect of roof control is better. 3) when the roadway passes through the goaf in the old mining area, the factors influencing the roof support effect are the strength of the bolt, the length of the bolt, the spacing of the bolt, and when the roadway of the old mining area passes through the goaf, the factors influencing the effect of roof support are as follows:. The combination of bolting strength 500MPa, bolt length 2.0m, bolt spacing 800mm is the most reasonable, and the effect of roof control is better. 4) when the roadway passing through the caving area in the old mining area, the factors influencing the roof support effect are the strength of the bolt, the length of the bolt, the spacing of the bolt, the order of the factors affecting the effect of roof support. However, the influence of bolt length and bolt spacing on the support effect is almost the same. When the roadway passes through the caving area in the old mining area, the support scheme is composed of bolting strength 500 MPA, bolt length 2.0 m, bolt spacing 800 mm, and so on. The control effect on roof is better.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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