【摘要】：基坑雙排樁支護(hù)結(jié)構(gòu)體系具有側(cè)向剛度大、抗傾覆能力強(qiáng)、施工方便、對周邊環(huán)境影響較小等優(yōu)點(diǎn),比較適合于變形控制要求嚴(yán)格、土質(zhì)條件較差的基坑工程中,是今后基坑工程中非常具有潛力的支護(hù)形式之一。然而,由于基坑雙排樁支護(hù)結(jié)構(gòu)體系的受力及變形機(jī)理非常復(fù)雜,其計算理論的研究還尚未成熟,從而嚴(yán)重阻礙了基坑雙排樁支護(hù)體系的發(fā)展。本文從樁間土等效代換的問題出發(fā),對基坑雙排樁支護(hù)結(jié)構(gòu)的計算方法,以及基坑雙排樁支護(hù)結(jié)構(gòu)的受力和變形特性做了進(jìn)一步的研究工作,具體內(nèi)容如下所示:(1)通過分析與總結(jié)現(xiàn)行國家和部分地方基坑行業(yè)規(guī)程中的雙排樁計算方法,從樁間土水平等效結(jié)構(gòu)體系的等效剛度入手,提出了三種基于規(guī)程的改進(jìn)雙排樁支護(hù)結(jié)構(gòu)計算模型。(2)基于等效桁架模型,將四邊形樁間土實體單元等效為六桿件桁架單元,進(jìn)而提出基于等效桁架模型的改進(jìn)基坑雙排樁支護(hù)結(jié)構(gòu)計算模型,并對該計算模型的使用做詳細(xì)的說明。(3)基于矩陣位移法對所提出的改進(jìn)計算模型進(jìn)行求解。按平面桿系結(jié)構(gòu)有限元法的思想,建立基坑雙排樁支護(hù)結(jié)構(gòu)的力學(xué)模型,利用矩陣位移法編寫相應(yīng)的MATLAB計算程序,從而實現(xiàn)對雙排樁支護(hù)結(jié)構(gòu)內(nèi)力及變形的求解。然后,通過兩個具體算例的對比分析,對所提出的四個雙排樁改進(jìn)計算模型的可行性及優(yōu)缺點(diǎn)展開討論。(4)將文中提出的基于等效桁架模型的改進(jìn)雙排樁計算模型應(yīng)用到典型工程案例中,采用自編MATLAB計算程序包對該工程案例進(jìn)行相關(guān)的計算。首先,采用自編MATLAB計算程序?qū)υ摴こ痰湫推拭娴母鱾�工況進(jìn)行分析計算,進(jìn)而探討各個工況下雙排樁支護(hù)結(jié)構(gòu)內(nèi)力及位移的變化規(guī)律。然后,利用該自編MATLAB計算程序,分析樁間土壓縮模量變化對基坑雙排樁支護(hù)結(jié)構(gòu)受力及變形特性的影響。
[Abstract]:The double row pile supporting structure system of foundation pit has the advantages of large lateral stiffness, strong capsizing resistance, easy construction and less influence on the surrounding environment. It is suitable for foundation pit engineering with strict deformation control requirements and poor soil conditions. It is one of the support forms with great potential in foundation pit engineering in the future. However, due to the complexity of the mechanism of stress and deformation of the double-row pile supporting system of foundation pit, the research of its calculation theory is not yet mature, which seriously hinders the development of the double-row pile supporting system of foundation pit. Starting from the problem of equivalent replacement of soil between piles, this paper makes further research on the calculation method of double-row pile supporting structure of foundation pit, as well as the mechanical and deformation characteristics of double-row pile supporting structure of foundation pit. The concrete contents are as follows: (1) by analyzing and summarizing the calculation methods of double-row piles in the current national and local foundation pit industry regulations, starting with the equivalent stiffness of the horizontal equivalent structure system between piles, Based on the equivalent truss model, the soil solid element between the quadrilateral piles is equivalent to the six-bar truss element. Then an improved calculation model of double-row pile supporting structure based on equivalent truss model is proposed, and the use of the model is explained in detail. (3) the improved calculation model is solved based on the matrix displacement method. According to the idea of finite element method of plane bar system structure, the mechanical model of double-row pile supporting structure of foundation pit is established, and the corresponding MATLAB calculation program is compiled by using matrix displacement method, so as to realize the solution of internal force and deformation of double-row pile supporting structure. Then, through the comparative analysis of two concrete examples, The feasibility, advantages and disadvantages of the four improved calculation models for double-row piles are discussed. (4) the improved double-row pile calculation model based on equivalent truss model is applied to typical engineering cases. The relevant calculation of the project case is carried out by using the self-made MATLAB program package. Firstly, the internal force and displacement of double-row pile supporting structure are analyzed and calculated by using self-compiled MATLAB program to analyze and calculate the typical working conditions of the project, and then the variation law of internal force and displacement of double-row pile supporting structure under each working condition is discussed. Then, the influence of soil compression modulus variation between piles on the mechanical and deformation characteristics of double-row pile supporting structure of foundation pit is analyzed by using the self-compiled MATLAB program.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 李永靖;陳通廣;郝連學(xué);閆宣澎;;基于FLAC~(3D)的雙排樁-錨桿復(fù)合支護(hù)結(jié)構(gòu)穩(wěn)定性分析[J];中國地質(zhì)災(zāi)害與防治學(xué)報;2016年04期

2 楊光華;黃忠銘;姜燕;徐傳堡;喬有梁;陳富強(qiáng);;深基坑支護(hù)雙排樁計算模型的改進(jìn)[J];巖土力學(xué);2016年S2期

3 曹凈;錢國偉;劉海明;任亞亮;;考慮支護(hù)結(jié)構(gòu)變形的基坑土壓力計算[J];四川建筑科學(xué)研究;2016年04期

4 程少彬;;軟土地區(qū)雙排樁支護(hù)模型在SAP2000中的實現(xiàn)和討論[J];建筑科學(xué);2015年03期

5 馬鄖;魏志云;徐光黎;董家興;李受祉;;基坑雙排樁支護(hù)結(jié)構(gòu)設(shè)計計算軟件開發(fā)及應(yīng)用[J];巖土力學(xué);2014年03期

6 王星華;謝李釗;章敏;;深基坑開挖中雙排樁支護(hù)的數(shù)值模擬及性狀[J];中南大學(xué)學(xué)報(自然科學(xué)版);2014年02期

7 孫濤;劉俊巖;劉燕;;雙排樁支護(hù)排距的優(yōu)化研究[J];巖土工程學(xué)報;2012年S1期

8 陳福江;馬建林;朱林;樂大維;;考慮壓縮模量深度效應(yīng)的深厚軟土樁基沉降計算[J];巖土力學(xué);2012年S2期

9 ;Three-dimensional numerical simulation and earth pressure analysis on double-row piles with consideration of spatial effects[J];Journal of Zhejiang University-Science A(Applied Physics & Engineering);2011年10期

10 龔曉南;;對巖土工程數(shù)值分析的幾點(diǎn)思考[J];巖土力學(xué);2011年02期

相關(guān)博士學(xué)位論文 前1條

1 萬漢斌;城市高密度地區(qū)地下空間開發(fā)策略研究[D];天津大學(xué);2013年

相關(guān)碩士學(xué)位論文 前2條

1 楊海星;基于樣條函數(shù)的基坑土層參數(shù)反演分析[D];昆明理工大學(xué);2016年

2 文俊;鋼筋混凝土結(jié)構(gòu)等效桁架模型理論研究[D];湖南大學(xué);2009年

，

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