Surrounding rock control technology of gob-side entry retaining in deep high mining face
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摘要:
综采工作面沿空留巷经历多次采动影响，矿压显现较为强烈，围岩变形量大，极易造成巷道围岩失稳。为了研究大采高工作面沿空留巷围岩控制问题，以某矿1313工作面留巷为研究背景，通过理论分析、数值模拟、现场实践等方法，分析沿空留巷围岩运动特征，提出“支−卸平衡”巷道围岩协同控制技术；加强了巷道围岩支护强度，改善了巷道围岩的应力环境。通过现场工程实践验证，1313工作面留巷的巷道顶底板变形量为246 mm，两帮变形量为442 mm，巷道表面没有明显的鼓出现象，巷道围岩变形量满足作业规程的相关规定。
Abstract:Under the influence of multiple mining influences, the mining pressure is more intense and the surrounding rock deformation is large, which is easy to cause the surrounding rock instability of gob-side entry retaining in fully mechanized mining face. In order to study the surrounding rock control problem of gob-side entry retaining in large mining height working face, taking 1313 working face retaining roadway as the research background, the movement characteristics of surrounding rock of gob-side entry retaining roadway were analyzed through theoretical analysis, numerical simulation, on-site practice, and other methods. The “support unloading balance” coordinated control technology for roadway surrounding rock was proposed, which strengthened the support strength of roadway surrounding rock and improved the stress environment of roadway surrounding rock. It was verified through on-site engineering practice. The deformation of the top and bottom of the roadway in a mine 1313 working face is 246 mm, and the deformation of the two sides is 442 mm. There is no obvious bulging phenomenon on the surface of the roadway, and the deformation of the surrounding rock of the roadway meets the relevant regulations of the operation regulations.
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图 1 1313工作面留巷围岩结构图
Figure 1. Structure diagram of surrounding rock of gob-side entry retaining roadway in 1313 working face
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图 3 支护方案改进前后巷道顶板变形量
Figure 3. Deformation of roadway roof before and after improvement of support plan
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图 4 支护方案改进前后巷道实体煤帮变形量
Figure 4. The deformation of solid coal slope of roadway before and after the improvement of the support plan
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图 5 支护方案改进前后巷旁支护体变形量
Figure 5. Deformation of support body beside the roadway before and after the improvement of the support plan
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图 6 支护方案改进前后实体煤侧应力分布情况
Figure 6. Stress distribution on the side of solid coal before and after improvement of support plan
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图 7 支护方案改进前后巷旁充填体内应力分布情况
Figure 7. Stress distribution in the filling body of the roadway before and after the improvement of the support plan
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图 8 沿空留巷围岩支护形式
Figure 8. Surrounding rock support form for gob-side entry retaining roadway
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图 9 沿空留巷表面位移监测结果
Figure 9. Monitoring results of surface displacement of gob-side entry retaining roadway
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图 10 沿空留巷实体煤帮应力监测结果
Figure 10. Monitoring results of solid coal slope stress of gob-side entry retaining roadway
表 1 试验获取的煤岩力学参数
Table 1 Mechanical parameters of coal and rock obtained through experiments
岩层名称 抗拉强度/MPa 抗压强度/MPa 弹性模量/GPa 泊松比 细砂岩 8.91 74.79 23.69 0.27 砂质泥岩 2.97 24.65 7.13 0.26 煤 0.83 13.32 2.74 0.37 泥岩 2.34 21.32 6.50 0.29 
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表 2 煤岩力学参数
Table 2 Mechanical parameters of coal and rock
岩层名称 体积模量/GPa 剪切模量/GPa 黏聚力/MPa 内摩擦角/(°) 细砂岩 17.17 9.33 3.7 45 泥岩 4.95 2.83 1.8 35 煤 3.51 1.00 1.2 31 砂质泥岩 5.16 2.52 2.8 37
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表 3 沿空留巷巷旁充填体应力监测结果
Table 3 Stress monitoring results of filling body next to gob-side entry retaining roadway
D/m 10 20 30 40 50 60 σ/MPa 6.85 12 20.15 19.43 18.93 17.44 D/m 70 80 90 100 110 120 σ/MPa 16.85 15.99 15.56 15.56 15.56 15.56 注：D为距离工作面的距离；σ为巷旁充填体应力。
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