【作者】 倪振强；

【导师】 付厚利；

【作者基本信息】 山东科技大学 ， 岩土工程， 2009， 硕士

【摘要】 对于深埋复合型软岩大断面硐室导硐法施工技术,目前还缺少成熟的理论和技术。本文在前人研究的基础上,以属于深厚表土基岩风化带内大断面硐室的焦煤集团赵固一矿矿井井底车场主要巷道硐室为研究背景,在对软岩力学性质及工程特性认识基础上,从深部高应力软岩巷道稳定性控制原则入手,归纳出巷道围岩变形的主要特点和影响因素;根据软岩巷道围岩区域划分及其特点,对软岩巷道围岩与支护结构的作用机理做出了分析,并提出了相应的软岩变形支护对策,研究了软岩巷道支护原理与最佳支护时间;对导硐法施工及机理进行了研究,对导硐法的实质和卸压、让压机理进行了研究。在此基础上,详细分析了导硐施工法的三种施工方法顶部导硐施工法,两侧导硐施工法,中央下导硐施工法;通过大型有限元软件FLAC^3D对硐室各施工过程进行了模拟,通过对顶部导硐施工法、两侧导硐施工法两种常用的导硐方式的施工过程的模拟,比较其导硐后的塑性区、硐室周边位移和最大最小主应力,得到合理的导硐尺寸。通过对二次刷扩施工过程的模拟,得到了合理的永久支护结构形式。验证了导硐法能有效释放应力、改善围岩承载能力,以及二次刷扩和支护结构的合理性。通过本课题的研究,在模型相似设计方面将提供一些有益的借鉴。更多还原

【Abstract】 For the pilot tunnel drift method technology in deeply buried large cross section chambers of composite soft rock is still a lack of maturity of the theory and technology. In this paper, on the basis of previous studies, it used the chambers of which belong to the thick overburden bedrock weathering zone large section: "Jiaomei group, Zhaogu the main tunnel chambers of No.1 mine shaft station" as the background of study. On the basis of understanding the mechanical properties and engineering characteristics of soft rock, from the stability control principle of deep high stress soft rock tunnel to start, summarized the main characteristics and influencing factors of the tunnel surrounding rock deformation; in accordance with the soft rock tunnel surrounding rock zone and its characteristics and engineering deformation mechanical mechanism of soft rock, it analyzed the mechanism of the soft rock tunnel surrounding rock with support structure, it proposed the corresponding soft rock deformation support measures; then it researched the pilot tunnel method construction and mechanism of the chambers and studied the essence, stress-relief mechanism and yielding mechanism. Then base on the study, it analyzed three pilot tunnel methods: the top half pilot tunnel method, the two sidepieces pilot drift tunnel method, the below centre pilot drift tunnel method; through large finite element software Flac3D stimulated the construction process of chambers, through the simulation to the top half pilot tunnel drift method, the two sidepieces pilot tunnel drift method, it compared the surrounding rock plastic zone, the displacement of the key points surrounding the tunnel, and the maximum principle stress and minimum principle stress, it got the reasonable size of the pilot tunnel. Through the simulation of the second brush expansion, formed a permanent support structure, it verified the pilot tunnel method can effectively guide the release of stress and improved the bearing capacity of surrounding rock, and the rationality of the second brushing expansion and support structure. Through the study of the subject, it will provide to the similar design of the model some useful lessons.更多还原