裂隙水渗流对隧道围岩稳定性的影响
发布时间：2019-06-07 13:59
【摘要】：为了保证隧道结构在高水位段富水区的安全稳定,必须解决外水压力对隧道衬砌的作用问题。在实际的工程中,地下水的突涌十分常见,要解决此类问题,就必须摸清地下水在裂隙岩体中的渗流规律和对隧道的影响。因此,对地下水的渗流进行分析和研究是十分有必要的。本文运用地下水渗流场分析原理,以重庆市双碑隧道依托工程为背景,进行了以下几个方面的研究:(1)隧道的施工开挖,将会导致原本稳定的围岩应力场和渗流场产生了重分布。开挖完成后,新形成的应力场和渗流场逐渐趋于稳定。求出围岩和衬砌中各个点的渗流速度,得到最大渗流速度和最小渗流速度的位置。(2)分别求出渗流前后衬砌外轮廓线上的变形量、等效应力、等效应变、X方向的应力应变和Y方向的应力应变。将渗流前后的数据进行比较,分析在应力场与渗流量场相互作用的过程中,两者之间的影响。(3)求解不同的因素对隧道衬砌渗流的影响:(1)当只存在围岩的级别不相同时,即在分别在Ⅴ级、Ⅳ级和Ⅲ级围岩的情况下,渗流对隧道衬砌水平方向和竖直方向的变形量和应力的影响;(2)当只存在隧道的净距不相同时,即分别在10米、20米和30米的净距下,渗流对隧道衬砌水平方向和竖直方向的变形量和应力的影响。
[Abstract]:In order to ensure the safety and stability of the tunnel structure in the rich water area of the high water level section, it is necessary to solve the problem of the effect of the external water pressure on the tunnel lining. In practical engineering, groundwater surge is very common. In order to solve this kind of problem, it is necessary to find out the seepage law of groundwater in fissured rock mass and its influence on tunnel. Therefore, it is very necessary to analyze and study the seepage of groundwater. Based on the principle of groundwater seepage field analysis and the background of Shuangbei Tunnel in Chongqing, the following aspects are studied in this paper: (1) the construction and excavation of the tunnel, It will lead to the redistribution of the stress field and seepage field of the original stable surrounding rock. After excavation, the newly formed stress field and seepage field tend to be stable. The seepage velocity of each point in surrounding rock and lining is obtained, and the positions of maximum seepage velocity and minimum seepage velocity are obtained. (2) the deformation, equivalent stress and equivalent effect on the outer profile of lining before and after seepage are calculated respectively. The stress and strain in the X direction and the stress and strain in the Y direction. The data before and after seepage are compared, and the interaction between stress field and seepage flow field is analyzed. The influence between the two. (3) to solve the influence of different factors on the seepage of tunnel lining: (1) when there is only different grade of surrounding rock, that is, in the case of grade V, IV and III surrounding rock, The influence of seepage on the deformation and stress of tunnel lining in horizontal and vertical directions; (2) when the net distance of the tunnel is not the same, that is, at the net distance of 10 m, 20 m and 30 m, the influence of seepage on the deformation and stress in the horizontal and vertical direction of the tunnel lining.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U451.2
[Abstract]:In order to ensure the safety and stability of the tunnel structure in the rich water area of the high water level section, it is necessary to solve the problem of the effect of the external water pressure on the tunnel lining. In practical engineering, groundwater surge is very common. In order to solve this kind of problem, it is necessary to find out the seepage law of groundwater in fissured rock mass and its influence on tunnel. Therefore, it is very necessary to analyze and study the seepage of groundwater. Based on the principle of groundwater seepage field analysis and the background of Shuangbei Tunnel in Chongqing, the following aspects are studied in this paper: (1) the construction and excavation of the tunnel, It will lead to the redistribution of the stress field and seepage field of the original stable surrounding rock. After excavation, the newly formed stress field and seepage field tend to be stable. The seepage velocity of each point in surrounding rock and lining is obtained, and the positions of maximum seepage velocity and minimum seepage velocity are obtained. (2) the deformation, equivalent stress and equivalent effect on the outer profile of lining before and after seepage are calculated respectively. The stress and strain in the X direction and the stress and strain in the Y direction. The data before and after seepage are compared, and the interaction between stress field and seepage flow field is analyzed. The influence between the two. (3) to solve the influence of different factors on the seepage of tunnel lining: (1) when there is only different grade of surrounding rock, that is, in the case of grade V, IV and III surrounding rock, The influence of seepage on the deformation and stress of tunnel lining in horizontal and vertical directions; (2) when the net distance of the tunnel is not the same, that is, at the net distance of 10 m, 20 m and 30 m, the influence of seepage on the deformation and stress in the horizontal and vertical direction of the tunnel lining.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U451.2
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