采空侧巷道围岩应力分析与控制技术研究
投稿时间:2019-12-09  修订日期:2020-01-02  点此下载全文
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王文杰 山西潞安矿业集团有限责任公司常村煤矿 449310950@qq.com 
中文摘要:常村煤矿S6-1皮顺为深部采空侧大变形巷道,亟需一种新的科学支护方式提高巷道围岩稳定性。通过分析煤层工作面工程地质条件,确定了包含煤层、顶板、底板的四种岩性试样进行物理力学试验,将试验结果赋值到UDEC模拟软件中模拟工程现场煤柱应力分布和巷道变形规律。结合现场情况和模拟结果,设计不同的切顶卸压方案并进行数值模拟对比。模拟结果表明,在垂直顶板方向切顶时,切顶高度26.1m、33.6m、44.0m和61m分别对应煤柱峰值支承应力28.5MPa、24.8MPa、23.1MPa、25.0MPa;切顶角度10°、20°、30°、40°分别对应煤柱峰值支承应力24.26MPa、24.03MPa、23.26MPa、24.42MPa。结合现场地质条件和施工条件,最终确定切顶高度为44.0m、切顶角度为30°为最优方案。现场试验结果表明,切顶卸压配合补强支护方案效果显著,有效减小了保护煤柱支承应力和巷道变形。
中文关键词:采空侧巷道  切顶卸压  数值模拟
 
Study on Surrounding Rock Stress and Control Technology of Goaf Side Roadway
Abstract:S6-1 roadway in Changcun Coal Mine is a large deformation roadway with deep goaf side. A new scientific support method is urgently needed to improve the stability of the surrounding rock of the roadway. By analyzing the engineering geological conditions of the coal seam working face, four lithological samples from coal seam, roof and floor were determined for physical and mechanical tests. The test results were assigned to UDEC simulation software to simulate the coal pillar stress distribution and roadway deformation law at the project site. Based on the site conditions and simulation results, we designed different cut-top pressure relief schemes and compared them with numerical simulations. The simulation results showed that when cutting the roof in the direction of the vertical roof, the cutting heights 26.1m, 33.6m, 44.0m, and 61m correspond to the peak support stress of the coal pillars 28.5MPa, 24.8MPa, 23.1MPa, 25.0MPa, respectively; 20°, 30°, and 40° correspond to peak support stresses of coal pillars of 24.26MPa, 24.03MPa, 23.26MPa, and 24.42MPa, respectively. Based on the site geological conditions and construction conditions, the optimal plan was finally determined with a cutting roof height of 44.0m and a cutting roof angle of 30°. The field test results showed that the effect of the cut-top pressure relief combined with the supplement support scheme was significant, and the supporting coal pillar support stress and roadway deformation were effectively reduced.
keywords:goaf side roadway  roof cut and pressure relief  supplement support  numerical simulation
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