本文選題：土質(zhì)基坑 + 樁錨支護(hù)��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：隨著重慶市直轄以來工程建設(shè)的加速發(fā)展，基坑工程數(shù)量愈來愈多。其中一些開挖深度內(nèi)全是土體的土質(zhì)基坑，其變形相比于巖質(zhì)基坑較大，但又不同于軟土地區(qū)的基坑，使得樁錨支護(hù)結(jié)構(gòu)體系在這類基坑中的應(yīng)用較為廣泛。由于目前基坑工程的設(shè)計理論尚不夠完善，，其支護(hù)體系的變形研究仍處于發(fā)展階段，因此利用數(shù)值分析方法對基坑變形進(jìn)行研究是十分必要的。但由于計算參數(shù)常常不易獲得，且對數(shù)值分析中的參數(shù)取值研究不夠重視，導(dǎo)致一些數(shù)值分析模型的可靠性較低，不能滿足工程要求；并且在實際施工中由于與設(shè)計脫節(jié)，未遵循時空效應(yīng)的分層開挖原則而超挖的現(xiàn)象時有發(fā)生，超挖引起的過大變形帶來了諸多工程問題。因此，本文針對重慶地區(qū)樁錨支護(hù)結(jié)構(gòu)的土質(zhì)基坑工程做了如下研究探討： ①對基坑工程設(shè)計分析的三種常用方法進(jìn)行了簡單介紹，并重點說明FLAC3D軟件的原理和適用性；探討數(shù)值模擬分析方法中的兩個關(guān)鍵問題，即本構(gòu)模型的選用及土體彈性模量的取值。 ②基于地勘報告中的土體參數(shù)，利用FLAC3D軟件對重慶地區(qū)樁錨支護(hù)結(jié)構(gòu)的土質(zhì)基坑工程實例進(jìn)行數(shù)值模擬。然后結(jié)合實測數(shù)據(jù)進(jìn)行土體參數(shù)的位移反演分析，得到了滿足工程要求的可靠數(shù)值分析模型；同時探討重慶地區(qū)適用于數(shù)值分析的土體彈性模量E的取值關(guān)系。 ③在上述可靠數(shù)值模型的基礎(chǔ)上，分析部分工程實例的原設(shè)計開挖工況的支護(hù)樁水平變形；然后重點進(jìn)行不同位置不同厚度的單一超挖工況的數(shù)值模擬分析，探討單一超挖對支護(hù)樁水平變形的影響規(guī)律。 ④結(jié)合支護(hù)樁水平變形的預(yù)警值，探討最大允許分層開挖厚度的理論值；并對其建議值的可行性進(jìn)行分析。
[Abstract]:With the rapid development of engineering construction in Chongqing, the number of foundation pit engineering is increasing. Some of them are soil foundation pit in the depth of excavation, its deformation is larger than that of rock foundation pit, but it is different from the foundation pit in soft soil area, so the pile-anchor support structure system is widely used in this kind of foundation pit. Because the design theory of foundation pit engineering is not perfect at present, the research on deformation of supporting system is still in the developing stage, so it is very necessary to study the deformation of foundation pit by using numerical analysis method. However, the calculation parameters are often difficult to obtain, and the research on the parameter values in the numerical analysis is not paid enough attention to, which leads to the low reliability of some numerical analysis models, which can not meet the engineering requirements, and is out of touch with the design in the actual construction. The phenomenon of overdigging occurs from time to time, which does not follow the principle of stratified excavation with space-time effect. The excessive deformation caused by over-excavation has brought a lot of engineering problems. Therefore, this paper has done the following research on the soil foundation pit engineering of pile and anchor support structure in Chongqing area: The main contents are as follows: 1. Three common methods of foundation pit engineering design and analysis are briefly introduced, and the principle and applicability of FLAC3D software are emphatically explained, and two key problems in numerical simulation analysis method are discussed. That is, the selection of constitutive model and the value of elastic modulus of soil. 2 based on the soil parameters in the geological prospecting report, the numerical simulation of soil foundation pit engineering example of pile and anchor supporting structure in Chongqing area is carried out by using FLAC3D software. Then, based on the measured data, a reliable numerical analysis model is obtained, which meets the requirements of engineering, and the relationship of soil elastic modulus E suitable for numerical analysis in Chongqing area is also discussed. 3 on the basis of the above reliable numerical model, the horizontal deformation of the supporting pile under the original design excavation condition of some engineering examples is analyzed, and then the numerical simulation analysis of the single overworking condition with different positions and different thickness is carried out. The influence of single overbreak on horizontal deformation of supporting pile is discussed. (4) based on the early warning value of horizontal deformation of supporting pile, the theoretical value of maximum allowable thickness of layered excavation is discussed, and the feasibility of the suggested value is analyzed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU470

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李宏偉;王國欣;;某地鐵站深基坑坍塌事故原因分析與建議[J];施工技術(shù);2010年03期

2 丁勇春;周順新;王建華;;深基坑開挖與土釘支護(hù)三維數(shù)值分析[J];上海交通大學(xué)學(xué)報;2011年04期

3 吳東;;武廣客運專線灰?guī)r殘積層紅粘土變形參數(shù)研究[J];土工基礎(chǔ);2010年02期

4 楊敏;趙錫宏;;分層土中的單樁分析法[J];同濟大學(xué)學(xué)報(自然科學(xué)版);1992年04期

5 趙海燕;基于冪函數(shù)形式的基坑變形預(yù)測[J];同濟大學(xué)學(xué)報(自然科學(xué)版);2003年08期

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

7 李琳;楊敏;熊巨華;;軟土地區(qū)深基坑變形特性分析[J];土木工程學(xué)報;2007年04期

8 彭明祥;廖海;楊愛兵;林余輝;劉楊;張祖武;;重慶瑞安超高層項目深基坑錨拉樁設(shè)計優(yōu)化與施工[J];施工技術(shù);2012年20期

9 周健;李業(yè)勛;張姣;;基于FLAC~(2D)的基坑全斷面分析及預(yù)警方法研究[J];施工技術(shù);2013年09期

10 黃海軍;;考慮不同開挖方式的基坑工程數(shù)值分析[J];西部探礦工程;2008年09期

相關(guān)博士學(xué)位論文 前2條

1 丁勇春;軟土地區(qū)深基坑施工引起的變形及控制研究[D];上海交通大學(xué);2009年

2 尹光明;城市隧道臨近建筑物超深基坑支護(hù)理論與安全控制技術(shù)研究[D];中南大學(xué);2012年

本文編號：1886355