本文選題：深基坑　切入點：分步開挖　出處：《中國地質大學(北京)》2017年碩士論文　論文類型：學位論文

【摘要】：社會經(jīng)濟的飛速發(fā)展增加了都市規(guī)模,伴隨而出現(xiàn)了相當數(shù)量的深大基坑,雖然基坑工程的發(fā)展和研究已經(jīng)有了一段時間,但是要因地制宜的找出最合適的支護方案,有效的控制基坑所產生的位移變形與降低工程費用,仍然有很多工作要做。本文以深圳晟潤豐國展項目基坑工程為例,借助于PLAXIS巖土分析軟件,在二維的平面上通過數(shù)值模擬分析,對開挖支護的每個階段進行分析。本文重點研究了基坑的穩(wěn)定性、支護結構和地鐵車站結構的變形,計算分析了每一種工況下支護結構的內力和變形,最后通過理正軟件計算驗證了基坑的穩(wěn)定性,和PLAXIS模擬得到的結論相互論證,證明模擬得到數(shù)據(jù)的準確性。主要工作和結論如下:1、系統(tǒng)地分析了基坑支護結構的設計計算理論,從基坑支護的要求和設計原則到支護結構的設計方法、結構形式以及適用條件,分析了基坑支護的現(xiàn)狀以及存在的相關問題。2、對有限元方法的原理進行了詳細的概述,同時詳細介紹了本文分析研究所采用的大型巖土工程有限元軟件PLAXIS,就其兩種典型的本構模型進行了簡要分析,并且針對相關結構單元進行了概述。3、結合工程實例,通過運用有限元軟件PLAXIS,考慮重點需要研究的緊鄰地鐵車站南邊的基坑支護,在二維平面通過數(shù)值模擬研究得到相關數(shù)據(jù),對開挖的每個階段進行了分析,得到了每個開挖階段的變形量和內力分布規(guī)律。最后和理正所得結論相互比較,證明建立模型的合理性。4、考慮了影響基坑穩(wěn)定性的相關因素,包括支護樁剛度、支護樁埋深、支護樁的剛度、開挖寬度以及土體的參數(shù)等,論述不同取值條件下基坑的位移量,從而找出相對合理的參數(shù),從不同的方面考察了支護結構的位移,同時也對其中相關要素進行了定性定量分析比較,這對于以后類似深基坑工程的工作開展提供了一定的經(jīng)驗。
[Abstract]:The rapid development of social economy has increased the scale of the city, accompanied by the emergence of a considerable number of deep and large foundation pit, although the foundation pit engineering development and research has been for some time, but to find out the most appropriate support plan according to local conditions. There is still a lot of work to be done to effectively control the displacement and deformation caused by the foundation pit and to reduce the project cost. This paper takes the Shenzhen Shengrun Fengguo project as an example and makes use of the PLAXIS software for geotechnical analysis. In this paper, the stability of foundation pit, the deformation of supporting structure and subway station structure are studied by numerical simulation analysis in two-dimensional plane. The internal force and deformation of supporting structure under each working condition are calculated and analyzed. Finally, the stability of foundation pit is verified by the calculation of straightening software, and the conclusion obtained by PLAXIS simulation is proved mutually. The main work and conclusion are as follows: 1. This paper systematically analyzes the design and calculation theory of foundation pit support structure, from the requirement and design principle of foundation pit support to the design method of supporting structure. The structure form and applicable conditions, the current situation of foundation pit support and the existing problems. 2. The principle of finite element method is summarized in detail. At the same time, the finite element software PLAXIS of large geotechnical engineering used in this paper is introduced in detail. Two typical constitutive models of PLAXIS are briefly analyzed. Through the use of finite element software PLAXIS, considering the key need to study the foundation pit support next to the south of subway station, the relevant data are obtained by numerical simulation in two-dimensional plane, and each stage of excavation is analyzed. The distribution law of deformation and internal force in each excavation stage is obtained. Finally, compared with the conclusion obtained by Li Zheng, the rationality of the model is proved. Finally, the relevant factors affecting the stability of foundation pit are considered, including the stiffness of supporting pile, the depth of supporting pile, and the stability of foundation pit. The stiffness, excavation width and soil parameters of the supporting pile are discussed. The displacement of the foundation pit under different values is discussed, and the relative reasonable parameters are found out. The displacement of the supporting structure is investigated from different aspects. At the same time, the qualitative and quantitative analysis of the relevant elements is also carried out, which provides some experience for the work of similar deep foundation pit engineering in the future.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU753
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本文編號：1611030