巨高巷道围岩稳定及控制

doi:10.13722/j.cnki.jrme.2014.s2.063

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摘要为解决巨高巷道的控制难题，选取山西某煤矿5205轨道巷超高段(断面：5.25×8 m)为研究对象，采用UDEC模拟巷高3.5～8.0 m过程中围岩响应特征，可以得出：(1) 偏应力分布形态均呈浅部升高，深部降低分布；两帮偏应力极大值降低，顶、底板的偏应力极大值升高，且偏应力极大值向深部转移，偏应力变化程度：帮＞顶板＞底板。(2) 围岩变形范围：帮＞顶板＞底板；围岩最大变形增加量：顶板＞帮＞底板。(3) 裂隙场呈“半椭圆”状分布，由里向外依次为：裂隙贯通区、裂隙发育区、微裂隙区。通过平衡拱分析得出，巷高增加使平衡拱迹线外移，即，帮最大不稳定宽度增加，顶板冒落拱增加，顶压增加。认为：(1) 群锚效应可减小围岩的碎胀变形。(2) 斜拉锚索可以穿过帮不稳定三角块锚固在肩角、底角无裂隙区。(3) 高性能高预紧力锚杆支护提高围岩力学参数(如内摩擦角)，相当于缩小平衡拱迹线。基于此提出高强高预紧力锚带网和帮斜拉锚索梁联合控制技术。巨高巷道支护完成后10 d实现自稳，顶底板相对移近量104 mm，两帮相对移近量150 mm，顶板累计离层3.5 mm。

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	许磊1
	吴焕凯2
	李博3
	肖同强4

关键词 ：岩石力学, 超高巷道, 偏应力, 裂隙, 平衡拱, 支护

Abstract：In order to investigate ground control of ultra-high roadway. The ultrahigh segment(section：5.25×8 m) of No. 5205 rail roadway in a mine was selected as research object，the surrounding rock response characteristic in the process of height from 3.5 m to 8 m was simulated by UDEC. Research results show that：(1) Deviatoric stress increases in shallow part and decrease in depth；Deviatoric stress maximum in sides decreases，also the maximum in roof and floor increases and transfers to the deeper；Deviatoric stress change degree：sides＞roof＞floor. (2) Surrounding rock deformation scope：sides＞roof＞floor and its maximal deformation increasing amount：roof＞sides＞floor. (3) Fracture fields are all distributed as semi-ellipse，which has fracture transfixion area，fracture area and microfracture area from the shallow to the deep. It shows that balanced arch contour become larger with roadway height increasing by analyzing balanced arch. That is the maximum un-stable width of sides，roof caving arch height and roof pressure are all increaseing. Realiszed that：(1) Anchor group effect reduces surrounding rock bulking deformation. (2) Diagonal cable could be anchoraged in the shoulder and bottom angle no fracture areas through un-stable triangle block. (3) High performance and pretension bolt support can enhance mechanical parameters such as internal friction angle，which could reduces balanced contour. Based on this，the combined support technology of high strength and high pre-stressing bolt net bar and sides diagonal cable beam is proposed. Self-stabilization period of ultra-high roadway is 10 days，roof-to-floor relative convergence is 104 mm，both sides relative convergence is 150 mm，the total roof separation is 3.5 mm.

Key words： rock mechanics ultra-high roadway deviatoric stress fracture balanced arch support

引用本文:

许磊1，吴焕凯2，李博3，肖同强4. 巨高巷道围岩稳定及控制[J]. 岩石力学与工程学报, 2014, 33(S2): 3891-3902.
XU Lei1，WU Huankai2，LI Bo3，XIAO Tongqiang4. STABILITY AND CONTROL OF SURROUNDING ROCK IN ULTRA-HIGH ROADWAY. , 2014, 33(S2): 3891-3902.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.s2.063 或 https://rockmech.whrsm.ac.cn/CN/Y2014/V33/IS2/3891

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