大断面泥岩砂岩隧道深浅埋限界研究

发布时间：2018-02-20 16:15

本文关键词： 隧道工程深浅埋划分方法限界泥岩砂岩　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着我国经济的快速发展,城市日益发展与城市交通拥堵的矛盾愈加明显。就城市发展而言,仅靠以往的“金桥银路”已无法解决城市拥堵的问题,地面交通的开发已经受到城市土地资源匮乏的严重制约,目前乃至将来要想解决这个问题只有深度开发城市地下空间资源,即大力发展城市地铁、隧道。众所周知隧道属于地下结构范畴,正确的区分隧道深浅埋类别对于隧道安全以及经济性都将起到极其重要的作用。隧道,无论是公路隧道还是铁路隧道,当它穿越在山体内或者地下时,隧道结构上部将承受来自周围围岩的压力,一个怎样的埋深深度才是该类地层隧道深浅埋的限界呢?以及如何应势选择支护形式对于隧道修建以及运营而言都显得异常重要。因此,如何根据隧道实际地质类别准确确定隧道埋深类别就显得尤为重要,而非单靠模糊性很强的经验数据来确定。本文将以重庆开县猴子岩隧道为工程实例,根据工程勘测、工程设计数据以及相关规范,并结合ANSYS有限元分析软件对该隧道深浅埋限界以及隧道支护形式提出一个合理的参考,为今后类似工程的修建提供参考。通过查阅并分析相关资料、文献,以及ANSYS有限元模拟,得出以下结论:①提出了通过分析隧道开挖后地表沉降规律判别隧道深浅埋限界的方法—地表沉降变化法。但其结果表明得出的深浅埋限界深度与规范推荐值差距较大,就目前情况而言作为判别隧道深浅埋的方法还尚欠妥当。②提出隧道深浅埋界定方法—围岩应力变化法,即通过分析隧道开挖前后拱顶正上方系列节点竖向应力变化规律得到隧道深浅埋限界,同时与规范推荐的深浅埋限界深度符合性较好。③通过有限元模拟计算,得到全断面泥岩地层以及砂岩地层2车道公路隧道深浅埋限界深度分别为19m和30m。同时考虑实际工程地质条件为大断面泥岩偶夹杂少量砂岩情况,将全断面泥岩和全断面砂岩综合考虑,从安全角度取综合地质情况深浅埋限界为19m~30m。④鉴于工程情况比较复杂,在实际工程中确定深浅埋限界时应结合工程实际情况综合判断。
[Abstract]:In recent years, with the rapid development of China's economy, the contradiction between urban development and urban traffic congestion is becoming more and more obvious. As far as urban development is concerned, the problem of urban congestion can not be solved by relying on the "Golden Bridge and Silver Road" in the past. The development of ground transportation has been seriously restricted by the scarcity of urban land resources. At present and even in the future, the only way to solve this problem is to develop urban underground space resources in depth, that is, to vigorously develop urban subway. Tunnels. As we all know, tunnels belong to the category of underground structures, and it will play an extremely important role in the safety and economy of tunnels to distinguish between the deep and shallow types of tunnels. Tunnel, whether it is a highway tunnel or a railway tunnel, When it passes through the mountain or underground, the tunnel structure will bear the pressure from surrounding rock. What depth is the boundary of the tunnel depth? And how to choose the supporting form is very important for tunnel construction and operation. Therefore, it is very important to determine the depth of tunnel according to the actual geological type of tunnel. This paper will take the Qianyan Tunnel of Kaixian County in Chongqing as an example, according to engineering survey, engineering design data and relevant specifications. Combined with the ANSYS finite element analysis software, a reasonable reference is put forward for the tunnel depth and shallow burying limit and the tunnel support form, which provides a reference for the construction of similar projects in the future. Through consulting and analyzing the relevant data, literature and ANSYS finite element simulation, The following conclusions are drawn as follows: 1. The method of ground subsidence variation is proposed by analyzing the law of ground subsidence after tunnel excavation, but the result shows that the difference between the depth of deep and shallow buried limit and the recommended value of code is large. In terms of the present situation, as a method of judging the depth and depth of the tunnel, it is still not appropriate .2 to put forward the method of defining the depth and depth of the tunnel, that is, the stress change method of surrounding rock. That is, by analyzing the vertical stress variation law of the series of joints above the arch roof before and after excavation, the tunnel depth and shallow burying limit is obtained. At the same time, the depth conformance with the depth of shallow and deep burying limit recommended by the code is good. 3. The finite element simulation calculation is carried out. It is obtained that the depth of shallow and shallow buried limit depth of two-lane highway tunnel is 19m and 30m, respectively. Considering the actual engineering geological conditions, a small amount of sandstone with large cross-section mudstone couple is considered. Considering the comprehensive consideration of full-section mudstone and full-section sandstone, taking the comprehensive geological condition depth and shallow burial limit as 19m / 30m.4 in view of the complex engineering situation, the comprehensive judgment should be combined with the engineering actual condition when determining the depth and shallow burial limit in practical engineering.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452

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