發(fā)布時間：2019-06-07 13:59

【摘要】：為了保證隧道結(jié)構(gòu)在高水位段富水區(qū)的安全穩(wěn)定,必須解決外水壓力對隧道襯砌的作用問題。在實際的工程中,地下水的突涌十分常見,要解決此類問題,就必須摸清地下水在裂隙巖體中的滲流規(guī)律和對隧道的影響。因此,對地下水的滲流進行分析和研究是十分有必要的。本文運用地下水滲流場分析原理,以重慶市雙碑隧道依托工程為背景,進行了以下幾個方面的研究:(1)隧道的施工開挖,將會導致原本穩(wěn)定的圍巖應力場和滲流場產(chǎn)生了重分布。開挖完成后,新形成的應力場和滲流場逐漸趨于穩(wěn)定。求出圍巖和襯砌中各個點的滲流速度,得到最大滲流速度和最小滲流速度的位置。(2)分別求出滲流前后襯砌外輪廓線上的變形量、等效應力、等效應變、X方向的應力應變和Y方向的應力應變。將滲流前后的數(shù)據(jù)進行比較,分析在應力場與滲流量場相互作用的過程中,兩者之間的影響。(3)求解不同的因素對隧道襯砌滲流的影響:(1)當只存在圍巖的級別不相同時,即在分別在Ⅴ級、Ⅳ級和Ⅲ級圍巖的情況下,滲流對隧道襯砌水平方向和豎直方向的變形量和應力的影響;(2)當只存在隧道的凈距不相同時,即分別在10米、20米和30米的凈距下,滲流對隧道襯砌水平方向和豎直方向的變形量和應力的影響。
[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.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U451.2

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本文編號：2494849