高壓富水區(qū)山嶺隧道滲流場影響因素敏感度分析
發(fā)布時間：2019-04-25 11:48
【摘要】：由于我國的山區(qū)面積龐大,地貌地形的條件比較復雜,那么在此復雜條件下修建山嶺隧道時,往往會遇到地下水豐富地區(qū),高壓富水的問題也會相應而來。在隧道工程中,如何計算作用在襯砌結構上的水壓力和隧道開挖過程中的斷面涌水量,以及在水壓力荷載作用下襯砌結構的安全性等等這些問題,都是隧道滲流場中相當重要的研究內(nèi)容。根據(jù)資料整理,已有研究報道多針對隧道滲流場中單一因素進行獨立研究,未結合多因素進行綜合研究。本文通過南大梁高速華鎣山隧道工程結合等效襯砌概念,并結合正交試驗對滲流場中六種影響因素進行分析,并對最顯著影響因素進行了有效區(qū)間分析,所取得的主要研究成果如下:(1)通過等效襯砌原則計算襯砌外水壓,與"堵水限排"結構下復合襯砌外水壓進行對比,經(jīng)過試算,得出了合理的等效襯砌滲透系數(shù)。(2)將等效襯砌、"堵水限排"復合襯砌和軸對稱解三種計算方法下的襯砌外水壓和隧道涌水量分別進行對比,事實證明"堵水限排"下襯砌外水壓和隧道涌水量可以用等效襯砌方法進行計算,且等效襯砌方法在理論上也是可行的。(3)基于軸對稱理論解,分析得出隧道滲流場影響因素為:等效襯砌滲透系數(shù)(隧道排水能力)、等效襯砌厚度、初期支護滲透系數(shù)、初期支護厚度、注漿圈滲透系數(shù)、注漿圈厚度。采用正交試驗結合等效襯砌方法進行影響敏感度研究發(fā)現(xiàn):等效襯砌滲透系數(shù)(隧道排水能力)為影響隧道滲流場最顯著的因素。(4)隧道滲流場中,等效襯砌水壓和隧道滲流量并不是一直隨等效襯砌滲透系數(shù)的變化而發(fā)生線性變化,而是存在一定的有效影響區(qū)間。研究分析可知,南大梁高速華鎣山隧道的等效襯砌滲透系數(shù)有效影響區(qū)間為1.04× 10-7cm/s～2.04×1-6cm/s。
[Abstract]:Because the mountainous area of our country is huge and the conditions of landform and topography are quite complex, when constructing the mountain tunnel under this complex condition, we often encounter the area rich in groundwater and the problem of high pressure and rich in water. In the tunnel engineering, how to calculate the water pressure acting on the lining structure and the cross-section water inflow during tunnel excavation, as well as the safety of the lining structure under the action of water pressure, and so on. All of them are very important research contents in tunnel seepage field. According to the data collation, most of the previous studies have carried out independent research on the single factor in the tunnel seepage field, but have not carried on the comprehensive research with the combination of the multi-factors. Based on the concept of equivalent lining in Nandaliang high-speed Huayingshan tunnel project and orthogonal test, six factors affecting seepage field are analyzed in this paper, and the most significant influencing factors are analyzed in effective interval. The main results obtained are as follows: (1) the external water pressure of the lining is calculated by the equivalent lining principle, and compared with the external water pressure of the composite lining under the structure of "blocking water limit and discharge". The reasonable permeability coefficient of the equivalent lining is obtained. (2) the external water pressure of the lining and the water inflow of the tunnel are compared with the calculation methods of the equivalent lining, the "water blocking and drainage" composite lining and the axisymmetric solution, respectively. It is proved that the external water pressure and tunnel water inflow can be calculated by the equivalent lining method, and the equivalent lining method is feasible in theory. (3) based on the axisymmetric theoretical solution, the water pressure and the tunnel water inflow can be calculated by the equivalent lining method. (3) based on the axisymmetric theoretical solution, The influence factors of tunnel seepage field are as follows: equivalent lining permeability coefficient (tunnel drainage capacity), equivalent lining thickness, initial support permeability coefficient, initial support thickness, grouting ring permeability coefficient, grouting ring thickness. Orthogonal test combined with equivalent lining method is used to study the influence sensitivity. It is found that the permeability coefficient of the equivalent lining (tunnel drainage capacity) is the most significant factor affecting the tunnel seepage field. (4) in the tunnel seepage field, the permeability coefficient of the equivalent lining is the most significant factor. The water pressure of the equivalent lining and the seepage rate of the tunnel do not change linearly with the change of the permeability coefficient of the equivalent lining, but there is a certain effective influence interval. The results show that the effective influence range of equivalent lining permeability coefficient of Nandaliang high-speed Huayingshan tunnel is 1.04 脳 10 ~ 7 cm ~ 2.04 脳 1-6 cm ~ (- 2. 04 脳 1 ~ (- 6) cm 路cm ~ (- 1).
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.1
本文編號：2465060
[Abstract]:Because the mountainous area of our country is huge and the conditions of landform and topography are quite complex, when constructing the mountain tunnel under this complex condition, we often encounter the area rich in groundwater and the problem of high pressure and rich in water. In the tunnel engineering, how to calculate the water pressure acting on the lining structure and the cross-section water inflow during tunnel excavation, as well as the safety of the lining structure under the action of water pressure, and so on. All of them are very important research contents in tunnel seepage field. According to the data collation, most of the previous studies have carried out independent research on the single factor in the tunnel seepage field, but have not carried on the comprehensive research with the combination of the multi-factors. Based on the concept of equivalent lining in Nandaliang high-speed Huayingshan tunnel project and orthogonal test, six factors affecting seepage field are analyzed in this paper, and the most significant influencing factors are analyzed in effective interval. The main results obtained are as follows: (1) the external water pressure of the lining is calculated by the equivalent lining principle, and compared with the external water pressure of the composite lining under the structure of "blocking water limit and discharge". The reasonable permeability coefficient of the equivalent lining is obtained. (2) the external water pressure of the lining and the water inflow of the tunnel are compared with the calculation methods of the equivalent lining, the "water blocking and drainage" composite lining and the axisymmetric solution, respectively. It is proved that the external water pressure and tunnel water inflow can be calculated by the equivalent lining method, and the equivalent lining method is feasible in theory. (3) based on the axisymmetric theoretical solution, the water pressure and the tunnel water inflow can be calculated by the equivalent lining method. (3) based on the axisymmetric theoretical solution, The influence factors of tunnel seepage field are as follows: equivalent lining permeability coefficient (tunnel drainage capacity), equivalent lining thickness, initial support permeability coefficient, initial support thickness, grouting ring permeability coefficient, grouting ring thickness. Orthogonal test combined with equivalent lining method is used to study the influence sensitivity. It is found that the permeability coefficient of the equivalent lining (tunnel drainage capacity) is the most significant factor affecting the tunnel seepage field. (4) in the tunnel seepage field, the permeability coefficient of the equivalent lining is the most significant factor. The water pressure of the equivalent lining and the seepage rate of the tunnel do not change linearly with the change of the permeability coefficient of the equivalent lining, but there is a certain effective influence interval. The results show that the effective influence range of equivalent lining permeability coefficient of Nandaliang high-speed Huayingshan tunnel is 1.04 脳 10 ~ 7 cm ~ 2.04 脳 1-6 cm ~ (- 2. 04 脳 1 ~ (- 6) cm 路cm ~ (- 1).
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.1
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