软岩隧道掌子面稳定性位移判定方法及控制技术研究

发布时间：2018-03-21 03:38

本文选题：软弱围岩　切入点：掌子面失稳　出处：《石家庄铁道大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着国家交通的大力发展，不可避免的会遇到地质条件差、变形大的隧道，保证隧道的稳定是正常的施工关键，由于掌子面的稳定是隧道稳定的一个重要方面，所以掌子面的稳定性是重要研究的对象。本文利用ANSYS软件，采用地层结构法将模型分为两种埋深，全断面和两台阶两种开挖工法以及有无支护的多种组合，通过对四种围岩级别的隧道模型进行分析，得到掌子面挤出位移与埋深、开挖工法和支护形式之间的关系。本文提出了利用掌子面挤出位移判断掌子面是否稳定的位移突变理论，，并且根据这个理论，还通过提高隧道掌子面超前开挖体的围岩参数的方法，去研究隧道超前加固对掌子面挤出位移的影响，并得出一定的结论。在埋深相同时，围岩参数越低，突变的时机越早。台阶开挖能够对掌子面挤出位移起到抑制作用。希望这些研究成果能够为以后相似工程的施工，提供一定的理论指导。
[Abstract]:With the rapid development of national traffic, it is inevitable to encounter tunnels with poor geological conditions and large deformation. It is the key of normal construction to ensure the stability of tunnels, because the stability of the face of the palm is an important aspect of tunnel stability. So the stability of the face of the palm is an important research object. In this paper, the model is divided into two kinds of buried depth, full section and two step excavation methods and multiple combinations of support or not by using ANSYS software and stratigraphic structure method. Through the analysis of four kinds of tunnel models of surrounding rock level, the relationship between the extrusion displacement of face face and buried depth, excavation method and support form is obtained. In this paper, the displacement catastrophe theory is proposed to judge whether the face is stable or not by using the extrusion displacement of the face of the face. According to this theory, the method of improving the surrounding rock parameters of the tunnel face is also presented. To study the influence of tunnel advance reinforcement on the extrusion displacement of face face, and draw a certain conclusion. The lower the surrounding rock parameter is, the lower the surrounding rock parameter is when the buried depth is the same. The earlier the time of sudden change is, the more step excavation can restrain the extrusion displacement of face face. It is hoped that these research results can provide some theoretical guidance for the construction of similar projects in the future.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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