2煤层回采巷道支护方式及参数优化研究

    Study on support mode and parameter optimization of the mining roadway in Ⅱ2 coal seam

    • 摘要: 针对回采巷道在掘进与回采过程中由于高地应力、剧烈扰动带来的支护和维护问题,本文以新庄矿-600 m水平的回采巷道为工程背景,通过现场实测巷道最大松动圈对巷道围岩稳定性进行分类,根据分类结果对巷道支护方式进行设计。采用FLAC3D软件在同等地质条件下对该方案进行模拟,分析确定合理的支护方式和支护参数;通过现场试验进行验证最终支护方案的支护效果。研究结果表明:①采用全锚方式的巷道表面位移量明显小于端锚,而加钢带之后巷道变形量变化较小,考虑安全因素,巷道的支护方式选取全锚+钢带+锚网支护最合适,考虑经济因素,选取锚杆间排距800 mm×800 mm最合适;②通过现场应用并进行观测表明,巷道顶板离层量很小,整体性较好,支护效果较好。

       

      Abstract: In view of the support and maintenance problems caused by high ground stress and severe disturbance in the process of excavation and mining, taking the -600 m level mining roadway in Xinzhuang mine as the engineering background, this paper classifies the stability of roadway surrounding rock through the field measured roadway maximum loose circle, and designs the roadway support mode according to the classification results.FLAC3D software is used to simulate the scheme under the same geological conditions, analyze and determine the reasonable support mode and support parameters, and field tests are carried out to verify the support effect of the final support scheme.The research results show that the roadway surface displacement with full anchor is obviously smaller than that with end anchor, and the roadway deformation changes less after adding steel belt.Considering safety factors, the roadway support mode of full anchor+steel belt+anchor mesh support is the most appropriate.Considering economic factors, the row spacing between bolts is 800 mm×800 mm is the most suitable.The field application and observation show that the roadway roof separation is very small, the integrity is good, and the support effect is good.

       

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