本文關(guān)鍵詞： 地鐵運行 不同初始固結(jié)度 三維有限元 動三軸試驗 長期沉降　出處：《浙江大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：地鐵引起的長期沉降從時間上可以劃分為兩個階段,即地鐵運營前的沉降和地鐵運營期間的沉降。其中地鐵運營前的沉降主要由隧道掘進引起,它包含了由于土體損失、正面附加推力、摩擦力等原因產(chǎn)生的瞬時沉降以及由超孔隙水壓力消散而產(chǎn)生的工后固結(jié)沉降。地鐵運營期間的沉降主要由列車荷載作用下土體累積塑性變形和累積超靜孔壓消散引起,并受到隧道施工的影響。 本文以杭州地區(qū)盾構(gòu)隧道工程為研究背景,對考慮施工影響下列車運營引起的地基土動力特性及沉降進行了研究,研究內(nèi)容及創(chuàng)新點包括： (1)將地鐵列車移動荷載簡化為多個移動輪軸荷載,分別以單個輪軸荷載和列車移動荷載為例,研究了地鐵列車荷載作用線正下方地基土中的動應(yīng)力特征、應(yīng)力路徑變化及主應(yīng)力軸旋轉(zhuǎn),分析了不同隧道埋深下荷載作用線正下方土單元應(yīng)力狀態(tài)變化。 (2)在理論基礎(chǔ)上,通過計算得到了盾構(gòu)隧道施工完成時超孔隙水壓力的分布,并利用MIDAS-GTS建立了三維有限元模型,得到了盾構(gòu)施工完成后不同時間段內(nèi)的地表沉降及超孔壓分布規(guī)律。 (3)以杭州地鐵一號線為背景,考慮杭州地鐵車輛、車輪、軌道系統(tǒng)這三者之間的相互作用關(guān)系,建立了車廂、轉(zhuǎn)向架、車輪三者運動耦合模型,將得到的荷載時程添加到三維有限元模型中分析得到了不同初始固結(jié)度下列車運行引起的地基土動力特性。 (4)研究在列車移動荷載作用下,地基土初始固結(jié)度分別為100%、90%、70%時,隧道拱頂、隧道起拱線和隧道拱底三個位置的超孔隙水壓力變化規(guī)律。 (5)將工后長期沉降分為不排水累積塑性變形引起的沉降和累積超靜孔壓消散引起的沉降兩部分,利用動三軸試驗建立了杭州地區(qū)不同固結(jié)度下累積孔壓模型,預(yù)測了杭州地鐵不同初始固結(jié)度下列車運行引起的長期沉降。
[Abstract]:The long-term settlement caused by the subway can be divided into two stages in time, that is, the settlement before the subway operation and the settlement during the subway operation, in which the settlement before the subway operation is mainly caused by the tunneling, which includes the loss of soil mass. Frontal additional thrust, The instantaneous settlement caused by friction and the post-consolidation settlement caused by the dissipation of excess pore water pressure are mainly caused by the accumulated plastic deformation of soil under train load and the dissipation of accumulated excess pore pressure. And affected by the tunnel construction. Taking the shield tunnel engineering in Hangzhou area as the research background, the dynamic characteristics and settlement of foundation soil caused by train operation under the influence of construction are studied in this paper. The research contents and innovations include:. 1. The moving load of subway train is simplified into several moving axle loads. Taking the single axle load and the train moving load as examples, the dynamic stress characteristics in the ground soil directly below the train load line are studied. The stress path change and principal stress axis rotation are analyzed, and the stress state changes of soil element directly below the load line under different tunnel depth are analyzed. 2) on the basis of theory, the distribution of excess pore water pressure at the completion of shield tunnel construction is calculated, and the three-dimensional finite element model is established by using MIDAS-GTS. The distribution of surface subsidence and superpore pressure in different periods after shield construction is obtained. Taking Hangzhou Metro Line 1 as the background, considering the interaction among Hangzhou metro vehicle, wheel and track system, a kinematic coupling model of carriage, bogie and wheel is established. The dynamic characteristics of foundation soil caused by train operation under different initial consolidation degrees are analyzed by adding the load time program to the three-dimensional finite element model. (4) under the action of moving train load, the variation law of excess pore water pressure in the three positions of tunnel arch top, tunnel arch line and tunnel arch bottom is studied. The initial consolidation degree of foundation soil is 100 ~ 90 and 70 respectively. The long-term settlement after construction is divided into two parts: the settlement caused by undrained cumulative plastic deformation and the settlement caused by cumulative excess pore pressure dissipation. The cumulative pore pressure model under different consolidation degrees in Hangzhou area is established by dynamic triaxial test. The long-term settlement caused by train operation under different initial consolidation degrees of Hangzhou Metro is predicted.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU435;U231

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