發(fā)布時(shí)間：2019-04-02 04:36

【摘要】：近些年來(lái),隨著我國(guó)經(jīng)濟(jì)的發(fā)展,全國(guó)深基坑工程的規(guī)模與深度屢創(chuàng)新高,而基坑開(kāi)挖作為基坑工程中的重要一環(huán),涉及因素眾多,研究起來(lái)難度較大。雖然我國(guó)已成功完成了一些大型基坑工程的設(shè)計(jì)及施工,但由于缺乏足夠的理論知識(shí)及工程實(shí)踐經(jīng)驗(yàn),基坑事故仍頻繁發(fā)生,這其中,基坑開(kāi)挖事故率占到基坑總數(shù)的1/4以上�？梢哉f(shuō),基坑開(kāi)挖階段是控制基坑變形與基坑事故的最重要控制點(diǎn)。因此,利用計(jì)算機(jī)技術(shù)對(duì)基坑開(kāi)挖過(guò)程進(jìn)行數(shù)值模擬分析具有重要的工程意義,同時(shí)利用信息技術(shù)結(jié)合現(xiàn)場(chǎng)施工數(shù)據(jù),反分析出準(zhǔn)確的計(jì)算參數(shù)來(lái)對(duì)基坑施工過(guò)程進(jìn)行動(dòng)態(tài)預(yù)測(cè),可大大減小基坑施工時(shí)的事故率,節(jié)省經(jīng)濟(jì)成本。本文結(jié)合合肥市恒大中心深基坑項(xiàng)目,利用MIDAS-GTS有限元軟件,對(duì)可行的基坑開(kāi)挖方案進(jìn)行數(shù)值模擬分析,優(yōu)選最佳方案;同時(shí)采用反分析方法,利用BP神經(jīng)網(wǎng)絡(luò)來(lái)反演土體力學(xué)參數(shù),預(yù)測(cè)下一施工階段基坑的變形特點(diǎn)并提出指導(dǎo)性的施工意見(jiàn)。本文的主要工作及結(jié)論如下:(1)總結(jié)歸納了基坑開(kāi)挖中幾種常用的開(kāi)挖方式,介紹了各開(kāi)挖方式的優(yōu)缺點(diǎn)及適用性,給出了基坑開(kāi)挖方案的初步設(shè)計(jì)流程,探討了影響基坑開(kāi)挖方案可行性的因素。(2)結(jié)合合肥市恒大中心深基坑工程背景,針對(duì)現(xiàn)場(chǎng)實(shí)際工程場(chǎng)地條件,基于基坑土方開(kāi)挖理論,提出三種可行的土方開(kāi)挖施工方案。(3)針對(duì)提出的三種可行的土方開(kāi)挖施工方案,通過(guò)MIDAS-GTS有限元分析軟件對(duì)三種可行的開(kāi)挖方案進(jìn)行數(shù)值模擬分析,從樁體深層水平位移、基坑周邊地表沉降、樁頂水平位移、錨索軸力四個(gè)方面進(jìn)行綜合比較分析,推薦最佳開(kāi)挖方案。(4)跟蹤現(xiàn)場(chǎng)施工,采用現(xiàn)場(chǎng)開(kāi)挖施工實(shí)測(cè)數(shù)據(jù),應(yīng)用反分析方法對(duì)開(kāi)挖階段進(jìn)行關(guān)鍵土力學(xué)參數(shù)反分析,獲得反分析出的土體彈性模量;基于反分析參數(shù)采用正分析方法預(yù)測(cè)后續(xù)施工階段基坑的變形及穩(wěn)定性,供施工時(shí)參考。(5)針對(duì)基坑中“坑中坑”開(kāi)挖對(duì)基坑的影響,采用反演的關(guān)鍵力學(xué)參數(shù),模擬預(yù)測(cè)“坑中坑”開(kāi)挖對(duì)基坑支護(hù)體系變形的影響。
[Abstract]:In recent years, with the economic development of our country, the scale and depth of deep foundation pit engineering in China have repeatedly reached new highs. As an important link in foundation pit engineering, foundation pit excavation involves many factors, and it is difficult to study it. Although our country has successfully completed the design and construction of some large-scale foundation pit projects, due to the lack of sufficient theoretical knowledge and engineering practice experience, foundation pit accidents still occur frequently, among which, The accident rate of foundation pit accounts for more than 1 / 4 of the total foundation pit. It can be said that the excavation stage is the most important control point to control the deformation and accident of foundation pit. Therefore, using computer technology to carry on the numerical simulation analysis to the foundation pit excavation process has the important engineering significance, at the same time uses the information technology to combine the field construction data, The accurate calculation parameters can be used to predict the process of foundation pit construction dynamically, which can greatly reduce the accident rate and save the economic cost in the construction of foundation pit. Based on the deep foundation pit project of Hefei Evergrande Center, this paper makes use of MIDAS-GTS finite element software to carry on the numerical simulation analysis to the feasible foundation pit excavation scheme, and optimizes the best scheme. At the same time, the inverse analysis method and BP neural network are used to invert the mechanical parameters of soil, to predict the deformation characteristics of the foundation pit in the next construction stage and to put forward some instructive suggestions for the construction of the foundation pit. The main work and conclusions of this paper are as follows: (1) several common excavation methods in foundation pit excavation are summarized, the advantages, disadvantages and applicability of each excavation mode are introduced, and the preliminary design flow of foundation pit excavation scheme is given. The factors that influence the feasibility of foundation pit excavation scheme are discussed. (2) combined with the background of Hefei Evergrande Center Deep Foundation Pit, according to the actual site conditions, based on the excavation theory of foundation pit earthwork, Three kinds of feasible earthwork excavation construction schemes are put forward. (3) according to the three feasible earthwork excavation construction schemes, three feasible excavation schemes are numerically simulated and analyzed by MIDAS-GTS finite element analysis software. Based on the comprehensive comparison and analysis of the deep horizontal displacement of the pile body, the settlement of the surface around the foundation pit, the horizontal displacement of the pile top and the axial force of the anchor cable, the optimum excavation scheme is recommended. (4) following the site construction and adopting the measured data of the site excavation construction, The inverse analysis method is used to analyze the key soil mechanical parameters in the excavation stage, and the elastic modulus of the soil is obtained. Based on the inverse analysis parameters, the forward analysis method is used to predict the deformation and stability of the foundation pit in the follow-up construction stage for reference. (5) in view of the influence of "pit-in-pit" excavation on the foundation pit in the foundation pit, the inverse key mechanical parameters are adopted. The influence of "pit in pit" excavation on the deformation of foundation pit supporting system is simulated and predicted.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU753

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