本文選題：剛柔組合樁 + 復合地基��； 參考：《重慶交通大學》2014年碩士論文

【摘要】：近年來，我國經(jīng)濟迅速發(fā)展，國家越來越注重基礎工程建設，尤其是公路建設。西部大開發(fā)以來，西部地區(qū)高速公路建設高速發(fā)展，，而西部地區(qū)的地形地貌嚴重的制約了其發(fā)展速度，其中山區(qū)軟土地基處理是一個很重要的原因。因此，研究山區(qū)軟土地基的特性以及處理方法是西部高速公路發(fā)展的一個重要課題。 目前，復合地基在處理山區(qū)軟土地基過程中發(fā)揮了重要作用。剛柔組合樁復合地基是近年來提出來的一種復合地基形式，其主要的工作機理為：充分利用柔性樁提高淺層的地基承載力；發(fā)揮剛性樁的工作特性，有效的控制復合地基沉降以及提高整個復合地基的地基承載力。目前，國內(nèi)外對此還沒有比較系統(tǒng)深入的研究，更沒有比較完善的設計理論和計算方法，因此對其研究是十分有必要的。 本文主要依托“貴州省交通廳科技項目——貴州山區(qū)高速公路軟基處理關鍵技術研究與示范工程”，收集分析總結了相關已有研究成果，對軟土地基的定義，軟土地基在貴州山區(qū)的破壞形式以及處理方法進行了概述；綜述了復合地基的承載力計算和沉降計算公式，為剛柔組合樁的承載力計算和沉降計算提供了依據(jù)；利用剛柔組合樁復合地基設計具體工程實例，其承載力計算結果和沉降量均能達到設計要求，并與其他處理方法進行比較，發(fā)現(xiàn)剛柔組合樁復合地基較其他處理方法可以有效的降低成本。 此外，利用PLAXIS有限元軟件，對剛柔組合樁復合地基進行了計算機施工數(shù)值模擬，并變換復合地基參數(shù)，研究各個因素對沉降的影響，得出了以下結論： ①褥墊層的厚度對剛柔組合樁復合地基沉降有明顯的影響，墊層厚度與剛柔組合樁復合地基沉降呈非線性關系； ②剛性樁的樁長變化對剛柔組合樁的沉降變化影響很大。 ③柔性樁的樁長變化對剛柔組合樁的沉降變化影響不大。 綜上所述：研究結果為剛柔組合樁復合地基的應用提供理論依據(jù)，對進一步發(fā)揮剛柔組合樁復合地基在軟基處理上的優(yōu)勢提供了現(xiàn)實意義，為保證貴州省交通安全提供了實用價值。
[Abstract]:In recent years, our country economy develops rapidly, the country pays more and more attention to the basic engineering construction, especially the highway construction. Since the development of the western region, the highway construction in the western region has developed at a high speed, but the terrain and geomorphology in the western region have seriously restricted its development speed, among which the soft soil foundation treatment in the mountainous area is a very important reason. Therefore, studying the characteristics and treatment methods of soft soil foundation in mountainous area is an important subject in the development of western expressway. At present, composite foundation plays an important role in the treatment of soft soil foundation in mountainous area. The composite foundation of rigid-flexible composite pile is a kind of composite foundation proposed in recent years. Its main working mechanism is to make full use of flexible pile to improve the bearing capacity of shallow foundation, to give full play to the working characteristics of rigid pile, Effectively control the settlement of composite foundation and improve the bearing capacity of the whole composite foundation. At present, there is no systematic and deep research on it at home and abroad, let alone perfect design theory and calculation method, so it is very necessary to study it. This paper mainly relies on the "key technology research and demonstration project of soft foundation treatment of highway in Guizhou mountainous area", and collects, analyzes and summarizes the related research results and the definition of soft soil foundation. The failure forms and treatment methods of soft soil foundation in Guizhou mountainous area are summarized, and the calculation formulas of bearing capacity and settlement of composite foundation are summarized, which provide the basis for calculation of bearing capacity and settlement of rigid-flexible composite pile. The calculation results of bearing capacity and settlement of composite foundation with rigid-flexible composite piles can meet the design requirements, and are compared with other treatment methods. It is found that the composite foundation of rigid-flexible composite pile can effectively reduce the cost compared with other treatment methods. In addition, by using PLAXIS finite element software, the numerical simulation of the composite foundation with rigid and flexible piles is carried out, and the parameters of the composite foundation are changed to study the influence of various factors on the settlement. The conclusions are as follows: (1) the thickness of cushion has obvious influence on the settlement of composite foundation with rigid-flexible composite pile, and the thickness of cushion has a nonlinear relationship with the settlement of composite foundation with rigid-flexible composite pile; (2) the variation of pile length of rigid pile has a great influence on the settlement of rigid-flexible composite pile, and the change of pile length of flexible pile has little effect on the settlement change of rigid-flexible composite pile. To sum up: the research results provide a theoretical basis for the application of the composite foundation of rigid and flexible composite piles, and provide practical significance for further exerting the advantages of the composite foundation of rigid and flexible composite piles in the treatment of soft foundation. It provides practical value for ensuring traffic safety in Guizhou province.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1

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本文編號：2094329