潼荣高速公路曾家山隧道围岩分级及稳定性评价

发布时间：2018-03-07 20:23

  本文选题：公路隧道　切入点：模糊综合评判法　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：改革开放以来,国家对基础设施的投资与建设越来越重视,在铁路和公路的建设上体现得尤为明显。伴随着科技的发展以及施工方式的改进,公路隧道越修越长、越修约深的发展趋势是不可逆转的。准确的围岩分级及稳定性评价是隧道勘察工作的核心部分,本文以重庆潼荣高速公路曾家山隧道项目为依托,运用定性和定量方法对围岩进行分级以及隧道进出口段稳定性进行评价,借助COMSOL Multiphysics软件模拟隧道开挖后,围岩的应力和位移变化,主要研究成果如下:(1)采用BQ法对围岩进行分级,曾家山隧道左右线围岩共分为Ⅲ级、Ⅳ级、Ⅴ级3个级别。右线:Ⅲ级围岩占比最大,长度687m,占比为42.22%;Ⅳ级围岩长度475m,占比为29.19%;Ⅴ级围岩占比最小,长度465m,占比为28.58%。左线:Ⅲ级围岩占比最大,长度690m,占比为42.38%;Ⅳ级围岩长度480m,占比约为29.48%;Ⅴ级围岩占比最小,长度458m,占比约为28.13%。(2)根据公路隧道设计规范围岩分级的评定指标和曾家山隧道的地质条件选用6个评价因素,建立评价指标体系,运用模糊数学理论,对隧道围岩进行分级,分级结果与BQ法结果一致。(3)采用赤平投影图解法对隧道进出口段进行稳定性评价:天然状态下进出口段斜坡稳定性较好,但围岩为Ⅴ级围岩,岩体较破碎,在隧道施工时有可能发生失稳变形,需进行及时支护。(4)选取隧道5个典型断面采用COMSOL Multiphysics软件进行数值模拟,分析隧道开挖后,围岩的应力和位移的分布特征和变化规律:Ⅲ级围岩段,围岩稳定性较好,位移量较小;Ⅳ级围岩段,围岩稳定性一般,位移量较大并与埋深呈正相关;Ⅴ级围岩段,围岩稳定性较差,位移量大。
[Abstract]:Since the reform and opening up, the state has paid more and more attention to the investment and construction of infrastructure, especially in the construction of railways and highways. With the development of science and technology and the improvement of construction methods, highway tunnels are being built longer and longer. The development trend of overbuilding contract depth is irreversible. Accurate surrounding rock classification and stability evaluation is the core part of tunnel investigation. This paper relies on the Zengjiashan Tunnel Project of Tongrong Expressway in Chongqing. The qualitative and quantitative methods are used to evaluate the stability of surrounding rock and the stability of tunnel inlet and outlet. The stress and displacement changes of surrounding rock after excavation are simulated by COMSOL Multiphysics software. The main results of this study are as follows: (1) the surrounding rock is classified by using the method of Bq. The surrounding rock of the left and right line of Zengjiashan Tunnel is divided into three classes: grade 鈪，

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