發(fā)布時(shí)間：2018-12-07 13:26

【摘要】：隨各種大型綜合交通樞紐的建設(shè)，應(yīng)運(yùn)而生了許多大型復(fù)雜深基坑，，雙排樁支護(hù)結(jié)構(gòu)因其施工方便、利于基坑土方開(kāi)挖等諸多優(yōu)點(diǎn)被越來(lái)越多的應(yīng)用于深大基坑的支護(hù)，因此研究深基坑雙排樁支護(hù)結(jié)構(gòu)開(kāi)挖力學(xué)效應(yīng)、分析雙排樁支護(hù)結(jié)構(gòu)穩(wěn)定性影響因素對(duì)于雙排樁支護(hù)結(jié)構(gòu)的優(yōu)化設(shè)計(jì)及工程應(yīng)用具有重要的意義。本文在總結(jié)國(guó)內(nèi)外相關(guān)研究成果的基礎(chǔ)上，以青島市某綜合交通樞紐深大基坑項(xiàng)目為工程背景，通過(guò)理論分析和數(shù)值模擬方法，對(duì)基坑開(kāi)挖過(guò)程中的空間效應(yīng)、雙排樁支護(hù)結(jié)構(gòu)的受力和變形特性、不同基坑開(kāi)挖寬度、不同樁頂連接方式、不同樁頂連梁截面尺寸和不同布樁方式對(duì)雙排樁支護(hù)結(jié)構(gòu)變形和受力的影響進(jìn)行了較為系統(tǒng)深入的研究。主要研究工作及研究成果如下： ①分析了現(xiàn)有關(guān)于雙排樁支護(hù)結(jié)構(gòu)的計(jì)算方法及各種計(jì)算方法的優(yōu)缺點(diǎn)，重點(diǎn)闡述了數(shù)值分析方法的優(yōu)越性。 ②采用數(shù)值分析方法，根據(jù)實(shí)際支護(hù)結(jié)構(gòu)參數(shù)和基坑周邊地質(zhì)條件建立數(shù)值模型，依據(jù)施工方案模擬開(kāi)挖過(guò)程，對(duì)比分析了大型基坑中不同位置處雙排樁支護(hù)結(jié)構(gòu)的變形和受力，給出了基坑坑角空間效應(yīng)的影響范圍及大型基坑中雙排樁支護(hù)結(jié)構(gòu)最不利分布區(qū)域。 ③在雙排樁支護(hù)結(jié)構(gòu)最不利分布區(qū)域中選取典型斷面，對(duì)基坑開(kāi)挖過(guò)程中雙排樁支護(hù)結(jié)構(gòu)的力學(xué)響應(yīng)進(jìn)行了研究，得出了基坑開(kāi)挖過(guò)程中雙排樁支護(hù)結(jié)構(gòu)的變形和受力分布規(guī)律：靠近基坑坑底處的土方開(kāi)挖對(duì)雙排樁側(cè)向變形影響較大，雙排樁支護(hù)結(jié)構(gòu)中前排樁分擔(dān)的荷載要大于后排樁。 ④分別研究了基坑開(kāi)挖寬度、樁頂連接方式、樁頂連梁截面尺寸和布樁方式對(duì)雙排樁支護(hù)結(jié)構(gòu)變形和受力的影響，研究結(jié)果表明：隨著基坑開(kāi)挖寬度的增大，雙排樁支護(hù)結(jié)構(gòu)受力和變形均增大；樁頂前后排連接時(shí)雙排樁支護(hù)結(jié)構(gòu)的支護(hù)效果與樁頂全連接基本相同；樁頂連梁截面尺寸為1d×0.5d（d為前后排樁樁徑）時(shí)，雙排樁支護(hù)結(jié)構(gòu)整體受力最小且能有效控制變形；不同布樁方式對(duì)雙排樁支護(hù)結(jié)構(gòu)變形和受力的影響較大。
[Abstract]:With the construction of a variety of large integrated transportation hubs, many large and complex deep foundation pits have emerged. The double-row pile supporting structure is more and more applied to the deep and large foundation pit support because of its convenient construction and the advantages of the earth excavation of the foundation pit and so on. Therefore, it is of great significance to study the excavation mechanics effect of double-row pile supporting structure in deep foundation pit and analyze the factors affecting the stability of double-row pile supporting structure for the optimization design and engineering application of double-row pile support structure. On the basis of summarizing the related research results at home and abroad, taking the deep and large foundation pit project of a comprehensive transportation hub in Qingdao as the engineering background, through theoretical analysis and numerical simulation method, the spatial effect in the excavation process of foundation pit is studied. The stress and deformation characteristics of double-row pile supporting structure, different excavation width of foundation pit, different pile top connection mode, In this paper, the effects of different cross section sizes and different distribution modes of piles on deformation and force of double-row pile supporting structure are studied systematically and deeply. The main research work and research results are as follows: 1 the advantages and disadvantages of the existing calculation methods of double-row pile supporting structure and various calculation methods are analyzed, and the superiority of numerical analysis method is emphasized. (2) the numerical model is established according to the parameters of the actual supporting structure and the geological conditions around the foundation pit, and the excavation process is simulated according to the construction plan. The deformation and force of double-row pile supporting structure at different positions in large foundation pit are compared and analyzed. The influence range of the space effect of pit angle and the most unfavorable distribution area of double-row pile supporting structure in large foundation pit are given. In the most unfavorable distribution area of double-row pile supporting structure, the mechanical response of double-row pile supporting structure during excavation is studied. It is concluded that the deformation and stress distribution of double-row pile support structure during excavation: the lateral deformation of double-row pile is greatly affected by earthwork excavation near the bottom of foundation pit, and the load of front row pile is larger than that of rear row pile in double-row pile supporting structure. 4. The influence of excavation width, pile top connection mode, pile top connecting beam cross-section size and pile arrangement mode on deformation and force of double row pile supporting structure are studied respectively. The results show that: with the increase of excavation width of foundation pit, The stress and deformation of double-row pile supporting structure are increased; The supporting effect of the double row pile supporting structure is basically the same as that of the pile top full connection, when the section size of the pile top connecting beam is 1 d 脳 0.5 d (d is the front and rear row pile diameter), the overall force of the double row pile supporting structure is the least and the deformation can be effectively controlled. The influence of different pile arrangement on deformation and force of double row pile supporting structure is great.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU473.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 侯學(xué)淵,劉國(guó)彬,黃院雄;城市基坑工程發(fā)展的幾點(diǎn)看法[J];施工技術(shù);2000年01期

2 李云安,張鴻昌,糜崇蓉;深基坑工程變形控制及其影響因素的有限元分析[J];水文地質(zhì)工程地質(zhì);2001年04期

3 陸培毅;楊靖;韓麗君;;雙排樁尺寸效應(yīng)的有限元分析[J];天津大學(xué)學(xué)報(bào);2006年08期

4 平揚(yáng),白世偉,曹俊堅(jiān);深基雙排樁空間協(xié)同計(jì)算理論及位移反分析[J];土木工程學(xué)報(bào);2001年02期

5 孫鈞;市區(qū)地下連續(xù)墻基坑開(kāi)挖對(duì)環(huán)境病害的預(yù)測(cè)與防治[J];西部探礦工程;1994年05期

6 戴智敏,陽(yáng)凱凱;深基坑雙排樁支護(hù)結(jié)構(gòu)體系受力分析與計(jì)算[J];信陽(yáng)師范學(xué)院學(xué)報(bào)(自然科學(xué)版);2002年03期

7 劉釗;雙排支護(hù)樁結(jié)構(gòu)的分析及試驗(yàn)研究[J];巖土工程學(xué)報(bào);1992年05期

8 趙錫宏,李蓓,李侃,楊國(guó)祥;大型超深基坑工程計(jì)算理論與實(shí)踐研究——上海外環(huán)隧道浦西基坑工程[J];巖土工程學(xué)報(bào);2003年03期

9 申永江;呂慶;尚岳全;;樁排距對(duì)雙排抗滑樁內(nèi)力的影響[J];巖土工程學(xué)報(bào);2008年07期

10 龔東慶;鄭淵仁;;硬化土體模型分析基坑擋土壁與地盤變形的評(píng)估[J];巖土工程學(xué)報(bào);2010年S2期

本文編號(hào)：2367274