高瓦斯综采工作面沿空留巷充填体宽度优化
Width Optimization of Gob-side Entry Retaining Filling Body in High Gas Full Mechanized Coal Face
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摘要: 针对潞安余吾矿区巷旁充填体的沿空留巷现场充填宽度不足，导致巷道稳定性得不到保证且巷道变形较大的问题，理论分析了综放尾巷留巷巷旁充填体的受力特点和变形特征，并利用FLAC3D对沿空留巷期内围岩变形特征进行数值模拟，确定了巷旁充填体的最优充填宽度。结果表明：巷旁充填体对巷道围岩的作用具有在短时间内可达到高强度、高阻力状态，并具备上佳的变形性能，从而实现非采煤帮、充填体和冒落矸石共同承但围岩压力；巷旁充填体宽度取值为1.5 m时，此时充填体宽度无应力集中向少应力集中的过度，峰值应力变化最为明显从8.3 MPa增加到12.6 MPa，在此情况下，巷道围岩变形量较小，观测点实测结果显示，顶底板移近量分别为331.3 mm和280.7 mm，两帮移近量分别为225.4 mm和171.7 mm，巷道围岩变形主要以顶板下沉为主，沿空留巷段巷旁支护基本满足围岩控制要求。Abstract: Aiming at the problem that insufficient filling width of filling bodys beside roadways in gob-side entry retaining causes the instability of roadway and the large deformation of roadway in Yuwu Mining Area of Lu’an Group, we analyzed the stress characteristics and deformation characteristics of filling bodys beside roadways of the fully mechanized tail lane, used FLAC3D to simulate the deformation characteristics of surrounding rocks in gob-side entry retaining, and determined the optimal filling width of filling bodys beside roadways. Results show that the effect of filling body beside roadways on the surrounding rock of roadway in a short time can achieve high strength, high resistance state, and has a good deformation performance, so as to realize the common bearing of the surrounding rock with non-mining slope, filling body and falling waste rock; when the width of the filling body of the roadway is 1.5 m, the width of the filling body is transferred from unstressed concentration to less stress concentration, and the peak stress change is most obviously increased from 8.3 MPa to 12.6 MPa, in this case, the surrounding rock deformation is smaller.The measured results of the two observation points show that the convergence amount of roof-to-floor is 331.3 mm and 280.7 mm, respectively, and the convergence amount of two sides is 225.4 mm and 171.7 mm, respectively. The roadway rock deformation is mainly roof subsidence and gob-side retaining lane along the roadway basically meets the surrounding rock control requirements.
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期刊类型引用(1)
1. 尚国银，张立辉. 大采高短壁综采工作面矿压规律研究及顶板管理. 煤炭科学技术. 2022(S1): 64-70 . 
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