窄高水材料巷旁充填沿空留巷围岩偏应力演化及控制

doi:10.11799/ce202302009

摘要/Abstract

摘要： 为了解决高水材料窄巷旁充填沿空留巷围岩破坏严重及难以控制的问题，以登茂通公司2202综采工作面1.4m窄高水材料巷旁充填沿空留巷为工程背景，基于实验室实验测试了水灰比为1.6∶1高水材料的强度特征，通过数值模拟及现场工程试验研究了高水材料窄巷旁充填沿空留巷围岩偏应力分布规律及其失稳破坏机制。结果表明：①随着超前工作面距离的不断增加，偏应力峰值带位置逐渐发生偏转，偏应力峰值大小逐渐减小，越靠近工作面采动影响越剧烈|②超前工作面40m范围内的巷道围岩偏应力峰值带主要集中在巷道右上肩角与左下肩角，超前工作面距离大于50m时的围岩偏应力峰值带主要集中在巷道顶底板围岩深部处，且近似呈对称状分布|③工作面回采且留巷完成后，留巷围岩偏应力峰值主要集中于实体煤帮与实体煤侧顶板处，支护时需保证锚索杆体穿过实体煤帮及顶板围岩偏应力峰值带位置。基于此提出高水材料窄巷旁充填沿空留巷围岩采用“顶板全锚索支护+巷内三排单体支柱+实体煤侧补强锚索加固+巷旁高水材料充填墙”对拉预紧锚杆并辅以单体柱护墙+采空区侧单体柱撑顶并辅以锚杆加固顶板的分区域非对称综合控制技术，通过现场工程实践证明了留巷围岩控制技术的合理性，保障了高水材料窄巷旁充填沿空留巷的稳定性。

关键词: 沿空留巷, 高水材料, 巷旁充填, 偏应力, 围岩控制

Abstract: In order to solve the problem of serious damage and difficult control of surrounding rock of gob-side entry retaining filled with narrow high-water material, the strength characteristics of high-water material with water cement ratio of 1.6:1 were tested based on laboratory experiments, according to the engineering background of gob-side entry retaining filled with narrow high-water material in Dengmaotong Coal Mine 2202 face. Based on numerical simulation and field engineering test, the distribution law of deviatoric stress and instability failure mechanism of surrounding rock of gob-side entry retaining filled with narrow high-water material are studied. The results show that: ① with the increasing of the leading face distance, the position of the deviatoric stress peak zone gradually deflects, the magnitude of the deviatoric stress peak gradually decreases, and the closer to the working face, the more severe the mining impact; ② The deviatoric stress peak zone of the surrounding rock of the roadway within 40 m of the leading working face is mainly concentrated in the right upper shoulder angle and the left lower shoulder angle of the roadway. When the distance leading working face is more than 50 m, the deviatoric stress peak zone of the surrounding rock is mainly concentrated in the deep part of the surrounding rock of the roof and floor of the roadway, and is approximately symmetrically distributed; ③ After the mining of the working face and the completion of the gob-side entry retaining, the peak value of the deviator stress of the surrounding rock of the roadway is mainly concentrated at the solid coal wall and the roof at the solid coal wall. During the support, it is necessary to ensure that the anchor cable passes through the position of the peak zone of the deviator stress of the surrounding rock of the solid coal wall and the roof. Based on this, a sub-regional asymmetric combined control technology of gob-side entry retaining with narrow high-water material and dual-roadways is proposed, which is named roof full anchor cable support + three-row single columns in the roadway + solid coal side reinforcement with anchor cable + pre-tightened anchor bolts supplemented with single column wall in roadside high-water material + supported roof by single pillar at the side of goaf and reinforced by anchor bolt. Field engineering practice proves that the control effects of roadway sur-rounding rock is well, and the stability of gob-side entry retaining with narrow high-water material and du-al-roadways is guaranteed.

中图分类号:

TD353

鄢德恒. 窄高水材料巷旁充填沿空留巷围岩偏应力演化及控制[J]. 煤炭工程, 2023, 55(2): 45-51.

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