本文選題：坑中坑式基坑工程 + 基坑變形�。� 參考：《華南理工大學(xué)》2014年碩士論文

【摘要】：由于建筑物地下室功能的需要或地下室基礎(chǔ)存在大大小小的承臺(tái),或者城市地下空間開發(fā)與地鐵車站共建，導(dǎo)致基坑坑底深度不盡相同，于是就出現(xiàn)了二級(jí)及多級(jí)基坑這一比較特殊的情況——坑中坑。在坑中坑式基坑工程中，人們一般大多關(guān)心開挖至外坑坑底過程中基坑的穩(wěn)定性和安全性，而往往忽略了基坑內(nèi)部的坑中坑對(duì)整個(gè)外圍基坑的影響。然而，，現(xiàn)有的規(guī)范規(guī)程并沒有提及坑中坑的相關(guān)設(shè)計(jì)原則，相關(guān)的研究及文獻(xiàn)也很少提及，所以坑中坑的開挖對(duì)于外坑變形的影響就很難考慮。 本文針對(duì)廣州市某一坑中坑式基坑工程實(shí)例，利用有限元分析軟件MIDAS/GTS對(duì)其進(jìn)行三維有限元模型的建立和分析，同時(shí)探討了不同影響因素下坑中坑對(duì)外坑支護(hù)結(jié)構(gòu)的影響，主要內(nèi)容如下： 1、介紹了基坑工程相關(guān)的基本理論，包括水土壓力的計(jì)算，基坑工程的失穩(wěn)形式，基坑工程的變形形式及其時(shí)空效應(yīng)，基坑工程的內(nèi)力計(jì)算方法，基坑工程相關(guān)的有限元理論，以及巖土工程中土的三個(gè)本構(gòu)模型：線彈性模型、非線性線彈性模型和彈塑性模型。 2、對(duì)簡(jiǎn)化模型進(jìn)行數(shù)值模擬，分析不同影響因素如坑中坑深度、內(nèi)外坑之間的距離、土體性質(zhì)、坑中坑支護(hù)結(jié)構(gòu)剛度以及坑中坑支護(hù)形式等對(duì)外坑支護(hù)結(jié)構(gòu)的影響。通過分析得到的結(jié)論可以為工程實(shí)踐提供指導(dǎo)意義。 3、對(duì)廣州市某坑中坑式基坑工程運(yùn)用MIDAS/GTS軟件進(jìn)行三維有限元模型的建立與分析，將計(jì)算結(jié)果與監(jiān)測(cè)結(jié)果進(jìn)行對(duì)比，以驗(yàn)證三維有限元模型的合理性和適用性。
[Abstract]:Due to the need of the basement function of the building or the existence of large and small caps in the basement foundation, or because of the development of underground space in the city and the co-construction of the subway station, the depth of the pit bottom is different. Therefore, the two-stage and multi-stage foundation pit is a special case-pit in the pit. In the pit pit engineering, people usually care about the stability and safety of the pit during the excavation to the bottom of the outer pit, but often ignore the influence of the pit inside the pit on the whole peripheral pit. However, the existing specifications do not mention the relevant design principles of the pit in the pit, and the relevant research and literature are also rarely mentioned, so it is difficult to consider the influence of the excavation of the pit in the pit on the deformation of the outer pit. In this paper, the three-dimensional finite element model of a pit in Guangzhou is established and analyzed by using the finite element analysis software MIDAS/GTS, and the influence of different factors on the supporting structure of the external pit is discussed. The main contents are as follows: 1. The basic theories of foundation pit engineering are introduced, including the calculation of soil and water pressure, the form of instability of foundation pit engineering, the deformation form of foundation pit engineering and its space-time effect, the calculation method of internal force of foundation pit engineering, and the finite element theory related to foundation pit engineering. And three constitutive models of soil in geotechnical engineering: linear elastic model, nonlinear linear elastic model and elastic-plastic model. 2. The simplified model is numerically simulated to analyze the influence of different factors, such as pit depth, distance between inside and outside pits, soil properties, stiffness of pit supporting structure and the form of pit support, etc. The conclusions obtained from the analysis can provide guidance for engineering practice. 3. In order to verify the rationality and applicability of the 3D finite element model, the three-dimensional finite element model is established and analyzed by using MIDAS/GTS software in a pit pit project in Guangzhou, and the calculated results are compared with the monitoring results in order to verify the rationality and applicability of the three-dimensional finite element model.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU753

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 徐飛飛;崔梓萍;徐意智;劉靖;;坑中坑的基坑變形分布及其變化規(guī)律[J];地下空間與工程學(xué)報(bào);2012年S1期

2 侯新宇;劉松玉;童立元;;地鐵換乘站坑中坑開挖變形特性[J];東南大學(xué)學(xué)報(bào)(自然科學(xué)版);2011年06期

3 金立堅(jiān),王志剛;"坑中坑"—高低跨深淺坑異形區(qū)間隧道的基坑施工技術(shù)——上海地鐵一號(hào)線南站站改建工程(三)[J];建筑施工;2005年09期

4 張杭生;;軟土地區(qū)深基坑“坑中坑”施工技術(shù)[J];建筑施工;2012年11期

5 孫冬青;;高壓旋噴樁在基坑開挖支護(hù)施工中的應(yīng)用分析[J];山西建筑;2013年24期

6 鄭俊星;賈堅(jiān);;地下空間開發(fā)與地鐵共建中坑中坑的安全穩(wěn)定性分析[J];上海交通大學(xué)學(xué)報(bào);2012年01期

7 龔曉南;關(guān)于基坑工程的幾點(diǎn)思考[J];土木工程學(xué)報(bào);2005年09期

8 王新;馬姣蓉;王印昌;;某坑中坑外坑圍護(hù)樁插入比優(yōu)化研究[J];施工技術(shù);2013年01期

9 鄭定芳,陸曉明;地下室坑中坑的支護(hù)技術(shù)[J];西部探礦工程;2004年11期

10 陳樂意;李鏡培;梁發(fā)云;廖志堅(jiān);;坑中坑對(duì)基坑圍護(hù)結(jié)構(gòu)水平位移影響數(shù)值分析[J];巖土工程學(xué)報(bào);2008年S1期

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