發(fā)布時(shí)間：2018-05-22 07:46

  本文選題：水位波動(dòng) + 深基坑��； 參考：《浙江大學(xué)》2013年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)的發(fā)展以及城市化進(jìn)程的加快,各地高層建筑、地下空間和設(shè)施正如火如荼地建設(shè),基坑工程所面臨的環(huán)境愈加復(fù)雜。近年來涌現(xiàn)了大量的臨海、臨江深基坑工程,與傳統(tǒng)內(nèi)陸遠(yuǎn)離開闊水域基坑工程不同的是,該類工程受波浪、潮汐等引起的水位波動(dòng)影響顯著,水位波動(dòng)對深基坑工程性狀的影響是隨工程實(shí)踐產(chǎn)生的一個(gè)新課題。而研究水位波動(dòng)條件下基坑的變形、穩(wěn)定和圍護(hù)結(jié)構(gòu)受力等變化,關(guān)鍵問題在于研究基坑周圍地基土的孔壓響應(yīng)機(jī)制。 本文首先提出了濱海淺層含水層地下水位波動(dòng)和臨海水位波動(dòng)兩種情況下的基坑滲流簡化分析模型,利用PLAXIS軟件,基于Biot固結(jié)理論,建立相應(yīng)的有限元數(shù)值分析模型；分析了淺層含水層地下水位波動(dòng)與水位在海床面以上波動(dòng)兩種條件下基坑及周圍地基的水土壓力響應(yīng),并討論相關(guān)參數(shù)對基坑滲流性狀的影響；依托于港珠澳大橋珠海拱北隧道明挖暗埋海域段基坑工程,分析了水位波動(dòng)對重力式擋墻基坑穩(wěn)定性的影響；最后根據(jù)滲流條件將基坑滲流場分區(qū),利用Laplace、Fourier變換分別推導(dǎo)了含水層地下水位波動(dòng)、水位在海床面以上波動(dòng)時(shí)板式支護(hù)結(jié)構(gòu)基坑,以及含水層地下水位波動(dòng)時(shí)重力式擋墻基坑周圍地基孔壓響應(yīng)的二維近似半解析解。得到以下主要結(jié)論： 1、由水位波動(dòng)引起的基坑周圍地基的相對超孔壓波動(dòng)幅值沿最短滲流路徑不斷衰減,淺層含水層地下水位波動(dòng)情況下基坑周圍孔壓波動(dòng)滯后現(xiàn)象明顯； 2、淺層含水層地下水位波動(dòng)情況下,綜合系數(shù)θ(與土體固結(jié)系數(shù)、海床厚度、水位波動(dòng)周期相關(guān))越大,基坑周圍地基的相對超孔壓波動(dòng)幅值越小,滯后相位越大；然而,當(dāng)水位在海床面以上波動(dòng)時(shí),θ越大,基坑主動(dòng)側(cè)的相對超孔壓波動(dòng)幅值越大,滯后相位越大,基坑被動(dòng)側(cè)的相對超孔壓波動(dòng)幅值則越小,但滯后相位還是越大；穩(wěn)態(tài)滲流(θ=0)時(shí)的相對孔壓為水位波動(dòng)條件下不同θ時(shí)相對超孔壓波動(dòng)幅值的極值； 3、傳播系數(shù)β越大,即飽和系數(shù)Sr越低,基坑周圍的波動(dòng)孔壓響應(yīng)幅值越小,孔壓波動(dòng)滯后相位越大； 4、圍護(hù)墻底至底部不透水邊界距離L、基坑寬度、滲透系數(shù)各向異性對水位波動(dòng)條件下基坑周圍的孔壓響應(yīng)影響明顯。
[Abstract]:With the development of economy and the acceleration of urbanization, high-rise buildings, underground space and facilities are being constructed in full swing, and the environment of foundation pit engineering is becoming more and more complex. In recent years, a large number of deep excavation projects near the sea have emerged. Unlike the traditional inland and open water excavation projects, these projects are significantly affected by water level fluctuations caused by waves, tides, etc. The influence of water level fluctuation on the engineering behavior of deep foundation pit is a new subject arising from engineering practice. The key problem of studying the deformation, stability and stress of the surrounding foundation pit under the condition of water level fluctuation lies in the study of the pore pressure response mechanism of the foundation soil around the foundation pit. In this paper, a simplified analysis model of foundation pit seepage under the condition of shallow aquifer groundwater level fluctuation and coastal water level fluctuation is put forward, and the corresponding finite element numerical analysis model is established by using PLAXIS software and based on Biot consolidation theory. The soil and water pressure responses of foundation pit and surrounding foundation are analyzed under the condition of groundwater level fluctuation in shallow aquifer and the fluctuation of water level above the seabed surface, and the influence of relevant parameters on the seepage behavior of foundation pit is discussed. The influence of water level fluctuation on the stability of gravity retaining wall foundation pit is analyzed based on the foundation pit engineering of Zhuhai Gongbei Tunnel of HongKong-Zhuhai-Macao Bridge, and the seepage field of foundation pit is divided according to the seepage condition, and the influence of water level fluctuation on the stability of gravity retaining wall foundation pit is analyzed. By means of Laplace Fourier transform, 2-D approximate semi-analytical solutions of the pore pressure response around the foundation pit of the gravity retaining wall and the aquifer groundwater level are derived, respectively, in which the groundwater level fluctuates above the seabed surface, the plate retaining structure foundation pit is subjected to the fluctuation of the water level above the seabed surface, and the pore pressure response around the foundation pit of the gravity retaining wall is obtained. The main conclusions are as follows: 1. The amplitude of the relative super-pore pressure fluctuation of the foundation pit caused by the water level fluctuation continuously attenuates along the shortest seepage path, and the lag phenomenon of the pore pressure fluctuation around the foundation pit is obvious under the condition of the shallow aquifer groundwater level fluctuation; 2. In the case of groundwater level fluctuation in shallow aquifer, the larger the comprehensive coefficient 胃 (relative to soil consolidation coefficient, seabed thickness, water level fluctuation period), the smaller the amplitude of the relative excess pore pressure fluctuation and the larger the lag phase of the foundation around the foundation pit. When the water level fluctuates above the seabed surface, the larger 胃, the larger the amplitude of the relative super-pore pressure fluctuation and the larger the lag phase of the active side of the foundation pit, and the smaller the amplitude of the relative super-pore pressure fluctuation of the passive side of the foundation pit, but the larger the lag phase. The relative pore pressure of steady flow (胃 ~ 0) is the extreme value of the fluctuation amplitude of relative excess pore pressure under the condition of water level fluctuation. 3. The larger the propagation coefficient 尾, the lower the saturation coefficient Sr, the smaller the response amplitude of the wave pore pressure around the foundation pit, and the larger the lag phase of the pore pressure fluctuation. 4. The impervious boundary distance from bottom to bottom, the width of foundation pit and the anisotropy of permeability coefficient have obvious influence on the response of pore pressure around the foundation pit under the condition of water level fluctuation.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU470

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