【摘要】：軟土地區(qū)高層建筑的興建,導(dǎo)致基坑工程處于富水的施工環(huán)境,由于軟弱土施工場(chǎng)地滲流場(chǎng)復(fù)雜,地下施工環(huán)境難以掌控,就不可避免的帶來一系列安全問題。因此針對(duì)基坑圍護(hù)結(jié)構(gòu)和近鄰建筑物穩(wěn)定性分析及安全監(jiān)測(cè)研究,對(duì)進(jìn)一步完善基坑支護(hù)方案,減少安全事故發(fā)生具有巨大的經(jīng)濟(jì)意義和社會(huì)價(jià)值。本文以軟土地區(qū)某文化廣場(chǎng)基坑工程為研究背景,借助數(shù)值模擬及現(xiàn)場(chǎng)安全監(jiān)測(cè)相結(jié)合的方法,對(duì)基坑圍護(hù)結(jié)構(gòu)和近鄰建筑物的穩(wěn)定性進(jìn)行了分析。論文的主要研究工作如下:(1)采用有限元軟件對(duì)基坑的分步施工過程,以及2倍基坑深度范圍內(nèi)的建筑物基礎(chǔ)變形進(jìn)行數(shù)值模擬計(jì)算。計(jì)算得出:地下連續(xù)墻在基坑開挖深度2/3處出現(xiàn)最大水平位移,基坑圍護(hù)墻軸向變形出現(xiàn)兩頭小、中間大的“括號(hào)”形狀;基坑底部淺層地下水位降形成明顯的漏斗狀,導(dǎo)致周圍土體固結(jié)沉降,引起近鄰建筑物基礎(chǔ)產(chǎn)生不均勻沉降。(2)分析基礎(chǔ)在不同距基坑邊沿距離、支護(hù)錨桿埋置深度、基礎(chǔ)剛度、上部荷載條件下近鄰建筑物的變形情況。結(jié)果表明:距基坑開挖深度1倍范圍內(nèi)是建筑物變形的主要影響區(qū);淺層錨桿成孔引起基礎(chǔ)兩端地基反力增大,導(dǎo)致近鄰建筑物基礎(chǔ)沉降越大;增強(qiáng)基礎(chǔ)剛度可控制建筑物沉降和傾斜變形;(3)通過數(shù)值模擬方法對(duì)軟土地區(qū)某文化廣場(chǎng)基坑工程的前期計(jì)算分析,結(jié)合安全監(jiān)測(cè)的報(bào)警情況,提出對(duì)基坑底部淺層土體進(jìn)行水泥土攪拌硬化處理和圍護(hù)墻后1倍基坑深度范圍的水泥注漿加固處理,跟蹤安全監(jiān)測(cè)信息,得出該措施成功控制了周圍土體的沉降速率,穩(wěn)固了基坑的施工安全,驗(yàn)證了施工方案的可行性。
[Abstract]:The construction of the high-rise building in the soft soil area leads to the foundation pit engineering in the water rich construction environment. Because the seepage field of the soft soil construction site is complex and the underground construction environment is difficult to control, it inevitably brings a series of safety problems. Therefore, the stability analysis and safety monitoring of the foundation pit enclosure and adjacent buildings and the safety monitoring are further studied. It is of great economic and social value to improve the foundation pit supporting scheme and reduce the occurrence of safety accidents. In this paper, the foundation pit engineering of a cultural square in the soft soil area is taken as the research background, and the stability of the foundation pit enclosure structure and near adjacent construction is analyzed with the help of numerical simulation and site safety monitoring. The following work is as follows: (1) the finite element software is used to simulate the step construction process of the foundation pit and the foundation deformation of the building in the depth of 2 times the depth of the foundation pit. The calculation shows that the maximum horizontal displacement of the diaphragm wall appears at the depth of 2/3 in the depth of the excavation, and the axial deformation of the retaining wall in the foundation pit has two small ends and the big "brackets" in the middle. Shape; the shallow groundwater level in the bottom of the foundation pit forms an obvious funnel shape, which leads to the consolidation and settlement of the surrounding soil and causes the uneven settlement of the adjacent building foundation. (2) the deformation of the adjacent buildings under different distance from the foundation pit, the buried depth of the anchoring bolt, the foundation stiffness and the upper loading condition. 1 times the depth of foundation pit excavation is the main influence area of the deformation of the building; the reinforcement of the foundation at the two ends increases with the shallow bolt hole forming, which leads to the greater settlement of the adjacent building foundation; the strengthening foundation stiffness can control the settlement and the tilting deformation of the building; (3) the early stage of the foundation pit engineering of a cultural square in the soft soil area by numerical simulation method Combined with the alarm situation of safety monitoring, the cement grouting reinforcement treatment for shallow soil soil in the bottom of foundation pit and 1 times the depth range of foundation pit depth after retaining wall is put forward, and the safety monitoring information is tracked, and the settlement rate of surrounding soil is controlled successfully, and the construction safety of foundation pit is stabilized and verified. The feasibility of the construction scheme is feasible.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU753

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