糜棱岩断层带引水隧洞关键施工技术研究

发布时间：2018-08-17 13:04

【摘要】：在水电开发的热潮中,随着水利资源的利用,水电站的建设进一步往偏远复杂的流域拓展。越来越复杂的地质条件给工程施工带来难题,糜棱岩断层带发生重大突泥突水风险控制关系到水电站能否成功。因此,研究水电开发工程施工过程中为通过泥化糜棱岩断层带采取的各种切实可行的技术措施,对类似工程中的突泥突水风险控制和施工具有重要的意义。本文通过某水电站引水隧洞的施工,对断层糜棱岩带突泥突水风险控制及综合施工技术进行了研究。研究内容包括:复杂地质条件下断层糜棱岩的探测方法研究、糜棱岩断层带隧洞固结注浆技术研究以及糜棱岩断层带隧洞施工工艺研究。取得的研究成果为:(1)把HSP超前地质探测技术成功应用于断层糜棱岩的探测,摸清了隧洞掌子面前方和周边一定范围的地质情况,有效克服了隧洞地质情况复杂、隧洞处于曲线上等难题。(2)突泥突水段采用全断面固结灌浆技术,解决钻孔难的问题,通过注浆在坍腔范围形成一定的加固结构,有效改善塌腔复杂的地质条件;开挖前的大管棚高压固结灌浆,注浆工作压力15MPa,以挤压扩散为主的注浆方式,改善泥化断层糜棱岩带的围岩状态。(3)把多台阶分部开挖技术、先底拱后顶拱衬砌同步施工技术及多工序平行作业技术有效地应用于断层破碎带引水隧洞的施工。
[Abstract]:In the upsurge of hydropower development, with the utilization of water resources, the construction of hydropower stations is further extended to remote and complex watersheds. More and more complicated geological conditions bring difficulties to engineering construction, and the risk control of water inrush in mylonite fault zone is related to the success of hydropower station. Therefore, it is of great significance for the risk control and construction of water inrush in similar projects to study various practical technical measures adopted in the construction process of hydropower development projects through mudding mylonite fault zone. Through the construction of diversion tunnel of a hydropower station, the risk control and comprehensive construction technology of water inrush in fault mylonite zone are studied in this paper. The research contents include: the exploration method of fault mylonite under complex geological conditions, the study of tunnel consolidation grouting technology in mylonite fault zone and the study of tunnel construction technology in mylonite fault zone. The results obtained are as follows: (1) the HSP advanced geological exploration technology has been successfully applied to the fault mylonite detection, and the geological conditions in front of and around the tunnel face have been found out, and the complex geological conditions of the tunnel have been overcome effectively. The tunnel is difficult on the curve. (2) the whole section consolidation grouting technique is adopted in the water inrush section to solve the problem of drilling difficulty, and the complex geological conditions of cavities are effectively improved by grouting to form a certain reinforcement structure in the area of cavern collapse; Before excavation, high pressure consolidation grouting and grouting working pressure 15MPa are used to improve the surrounding rock state of the mylonite zone of the muddy fault. (3) the multi-step partial excavation technique is put forward to improve the surrounding rock state of the mylonite belt of the muddy fault. The synchronous construction technology of first bottom arch and then top arch lining and multi-working procedure parallel operation technology are effectively applied to the construction of diversion tunnel in fault broken zone.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV554

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