本文選題：PBA工法　切入點：CRD工法　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：地鐵隧道的出現(xiàn)很好的緩解了城市交通的壓力,但是由于地下空間的大規(guī)模開發(fā),地鐵隧道不可避免的要穿越一些高水位的富水軟弱地層區(qū)域。在這種情況下,地下滲流會對隧道施工造成極大的影響,例如:加大土層和周邊建筑的固結(jié)沉降量、造成地表的不均勻沉降和圍巖的不均勻變形等。然而,為了簡化計算過程,目前在研究隧道施工時常選擇忽略地下水的影響,因此該方向的研究還不成熟。本文以北京市朝陽區(qū)CRD法開挖的地下通道和PBA法開挖的地鐵車站為背景,研究了地下水-圍巖-隧道支護結(jié)構(gòu)三者的流固耦合效應(yīng)(FSI)和力學(xué)效應(yīng),主要工作與研究內(nèi)容如下所示:(1)簡要闡述飽和土的滲流理論,并基于滲流連續(xù)性方程和比奧(Biot)固結(jié)理論推導(dǎo)土體三維滲流場和應(yīng)力場耦合的微分方程。(2)對暗挖隧道地表沉降、拱頂變形、洞壁收斂、初支壓力及洞內(nèi)滲水情況等數(shù)據(jù)進行收集與篩選,選擇適合于計算、分析的典型斷面。(3)簡要介紹顯式有限差分元軟件FLAC~(3D)中關(guān)于滲流與應(yīng)力耦合的數(shù)值表達方式。運用FLAC~(3D)流固耦合計算模式模擬兩個隧道的施工過程,分別在考慮與不考慮流固耦合的情況下建立數(shù)值模型,計算不同導(dǎo)洞施工順序的情況下CRD和PBA隧道地表沉降和圍巖及支護結(jié)構(gòu)的變形與受力情況,對比不同情況下位移場、應(yīng)力場和滲流場變化過程,得出地下水對于隧道開挖造成的影響。(4)對比分析朝陽六里屯地下通道施工監(jiān)測數(shù)據(jù),驗證數(shù)值模擬的合理性,并評價隧道施工的安全性,得出的結(jié)果可為后續(xù)施工提供指導(dǎo)和借鑒。(5)運用得到的研究經(jīng)驗,對同地區(qū)的朝陽公園地鐵站展開研究,探究在洞樁法施工的條件下,地下水對不同導(dǎo)洞施工順序造成的影響。
[Abstract]:The emergence of subway tunnels has alleviated the pressure on urban traffic. However, due to the large-scale development of underground space, subway tunnels inevitably have to cross some high water level areas of water-rich soft strata. In this case, Underground seepage will have a great impact on tunnel construction, such as increasing the consolidation settlement of soil layer and surrounding buildings, causing uneven settlement of the surface and non-uniform deformation of surrounding rock, etc. However, in order to simplify the calculation process, At present, the influence of groundwater is often ignored in the study of tunnel construction, so the research in this direction is not mature. This paper takes the underground passage excavated by CRD method and the subway station excavated by PBA method in Chaoyang District of Beijing as the background. The fluid-solid coupling effect (FSI) and mechanical effect of groundwater, surrounding rock and tunnel supporting structure are studied. The main work and research contents are as follows: (1) the seepage theory of saturated soil is briefly described. Based on the continuity equation of seepage flow and Biotot's consolidation theory, the differential equation of coupling three dimensional seepage field and stress field of soil is derived. Data such as initial branch pressure and water seepage in the tunnel are collected and screened, and suitable for calculation is selected. The numerical expression of seepage and stress coupling in explicit finite difference element software FLAC3D is briefly introduced. The fluid-solid coupling calculation model is used to simulate the construction process of two tunnels. In this paper, numerical models are established with or without consideration of fluid-structure coupling to calculate the ground subsidence, deformation and stress of surrounding rock and supporting structure of CRD and PBA tunnels under different construction sequence of guide tunnel, and the displacement field under different conditions is compared. The variation process of stress field and seepage field is obtained. The influence of groundwater on tunnel excavation is obtained.) the construction monitoring data of Chaoyang Liulitun underground tunnel are compared and analyzed, the rationality of numerical simulation is verified, and the safety of tunnel construction is evaluated. The results can provide guidance and reference for further construction. Using the research experience obtained, the paper studies the subway station of Chaoyang Park in the same area, and probes into the influence of underground water on the construction sequence of different diversion tunnels under the condition of tunnel pile construction.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U451;U231

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