【摘要】：隨各種大型綜合交通樞紐的建設(shè)，應(yīng)運而生了許多大型復(fù)雜深基坑，，雙排樁支護結(jié)構(gòu)因其施工方便、利于基坑土方開挖等諸多優(yōu)點被越來越多的應(yīng)用于深大基坑的支護，因此研究深基坑雙排樁支護結(jié)構(gòu)開挖力學(xué)效應(yīng)、分析雙排樁支護結(jié)構(gòu)穩(wěn)定性影響因素對于雙排樁支護結(jié)構(gòu)的優(yōu)化設(shè)計及工程應(yīng)用具有重要的意義。本文在總結(jié)國內(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目為工程背景，通過理論分析和數(shù)值模擬方法，對基坑開挖過程中的空間效應(yīng)、雙排樁支護結(jié)構(gòu)的受力和變形特性、不同基坑開挖寬度、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雙排樁支護結(jié)構(gòu)變形和受力的影響進行了較為系統(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)于雙排樁支護結(jié)構(gòu)的計算方法及各種計算方法的優(yōu)缺點，重點闡述了數(shù)值分析方法的優(yōu)越性。 ②采用數(shù)值分析方法，根據(jù)實際支護結(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)施工方案模擬開挖過程，對比分析了大型基坑中不同位置處雙排樁支護結(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結(jié)構(gòu)最不利分布區(qū)域。 ③在雙排樁支護結(jié)構(gòu)最不利分布區(qū)域中選取典型斷面，對基坑開挖過程中雙排樁支護結(jié)構(gòu)的力學(xué)響應(yīng)進行了研究，得出了基坑開挖過程中雙排樁支護結(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挖對雙排樁側(cè)向變形影響較大，雙排樁支護結(jié)構(gòu)中前排樁分擔(dān)的荷載要大于后排樁。 ④分別研究了基坑開挖寬度、樁頂連接方式、樁頂連梁截面尺寸和布樁方式對雙排樁支護結(jié)構(gòu)變形和受力的影響，研究結(jié)果表明：隨著基坑開挖寬度的增大，雙排樁支護結(jié)構(gòu)受力和變形均增大；樁頂前后排連接時雙排樁支護結(jié)構(gòu)的支護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，雙排樁支護結(jié)構(gòu)整體受力最小且能有效控制變形；不同布樁方式對雙排樁支護結(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)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU473.2

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