小庄矿冻结风井井筒围岩破坏机理及解冻后水害防治技术

发布时间：2018-03-24 23:20

本文选题：非全深冻结法　切入点：风井　出处：《西安科技大学》2015年硕士论文

【摘要】：开展煤矿非全深冻结法冻结立风井围岩破坏机理及解冻后水害防治技术研究具有重要的工程应用价值。本文以小庄煤矿立风井非全深冻结法凿井工程为依托,采用理论研究、FLAC数值模拟与现场工程实践相结合的手段开展研究工作,主要结论有:(1)小庄煤矿风井井筒采用非全深冻结法施工,给出了小庄煤矿风井井筒非全深冻结法方案,包括冻结参数确定、冻结孔布置、测温孔设计、水文孔设计以及冻结壁形成的预测等。(2)运用FLAC软件对小庄矿冻结风井围岩破坏规律进行了研究,结果表明:井筒开挖后最大位移发生在开口端,最大位移为6.3mm,满足凿井安全规程不超过50mm的要求,风井围岩较为稳定;在每一个掘砌段高,井帮最大竖向位移发生在开挖段高距已筑井壁约1/3段高位置处。(3)完成了小庄煤矿风井井筒的围岩支护方案设计,并提出小庄煤矿风井井筒施工掘进工程、钢筋工程、模板工程、混凝土支护工程及锚喷网支护工程的施工质量保证措施。(4)分析裂隙动水环境下浆液的扩散规律,以逆水扩散距离N和浆液扩散开度L两个指标作为主要参数得到了浆液扩散的表达公式;制定了小庄煤矿风井井筒解冻融化后的涌水防治方案。实践表明注浆后风井井筒的涌水量由15m~3/h降为0.4m~3/h,满足有关规范对井筒涌水量的要求,井筒融化后的防治水效果良好。
[Abstract]:It is of great value to study the failure mechanism of surrounding rock and the prevention and cure technology of water hazard after thawing. Based on the incomplete deep freezing shaft sinking project of Xiaozhuang coal mine, this paper presents a new method to solve the problem. The research work is carried out by means of combining theoretical research with FLAC numerical simulation and field engineering practice. The main conclusions are as follows: the wind shaft of Xiaozhuang coal mine is constructed by the method of incomplete deep freezing, and the scheme of incomplete deep freezing of air shaft of Xiaozhuang coal mine is given. Including freezing parameters determination, freezing hole layout, temperature measuring hole design, hydrological hole design and prediction of freezing wall formation, etc.) the failure law of surrounding rock of freezing air well in Xiaozhuang Mine is studied by using FLAC software. The results show that the maximum displacement occurs at the opening end of the shaft, and the maximum displacement is 6.3 mm, which meets the requirements of safety regulation of shaft sinking no more than 50mm, and the surrounding rock of the air shaft is relatively stable, and is high in each excavation section. The maximum vertical displacement of the shaft occurred at the height of about 1 / 3 of the built shaft wall in the excavation section, and completed the surrounding rock support scheme design of the air shaft shaft in Xiaozhuang coal mine, and put forward the construction tunneling project, reinforcement engineering and formwork engineering of the air shaft shaft in Xiaozhuang coal mine. The construction quality assurance measures of concrete support engineering and bolting shotcrete mesh support engineering. The expression formula of slurry diffusion was obtained by using the two parameters of inverse water diffusion distance N and slurry diffusion opening L as the main parameters. The prevention and control scheme of water inflow in the air shaft of Xiaozhuang coal mine after thawing and thawing has been formulated. The practice shows that the water inflow of the air well after grouting is reduced from 15m~3/h to 0.4 mb / h, which meets the requirements of relevant specifications for wellbore water inflow, and the effect of preventing and controlling water after wellbore melting is good.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD745;TD265.3

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