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  本文關(guān)鍵詞： 不排水樁 復(fù)合地基 固結(jié) 解析解 加固區(qū) 下臥層　出處：《上海理工大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：復(fù)合地基固結(jié)理論是復(fù)合地基理論的重要組成部分。目前散體材料樁復(fù)合地基的固結(jié)分析計算問題上已經(jīng)進行了比較深入的研究，但對于不排水樁（例如水泥土樁）復(fù)合地基的固結(jié)計算研究很少。針對這一課題進行深入研究既有重要的理論意義又有實際應(yīng)用價值。本文對不排水懸浮樁復(fù)合地基的固結(jié)解析理論進行了分析研究，主要工作如下： 1.利用Plaxis有限元分析軟件對不排水懸浮樁復(fù)合地基的固結(jié)特性進行了數(shù)值模擬分析，為不排水懸浮樁復(fù)合地基固結(jié)解析解的建立奠定了基礎(chǔ)。 2.在等應(yīng)變假定的基礎(chǔ)上，推導(dǎo)出在瞬時加荷情況下不排水懸浮樁復(fù)合地基加固區(qū)樁間土和下臥層土各自的固結(jié)方程。在雙層地基固結(jié)理論的基礎(chǔ)上，建立了不排水懸浮樁復(fù)合地基的固結(jié)解析解，包括分別按沉降定義和孔壓定義的復(fù)合地基固結(jié)度解答。根據(jù)提出的復(fù)合地基固結(jié)度的解析解，分析了相對加固深度、置換率以及樁與樁間土模量比對復(fù)合地基固結(jié)速率的影響。 3.分別建立了不排水懸浮樁復(fù)合地基加固區(qū)樁間土和下臥層土固結(jié)解析解。分析了置換率和樁土模量比對各自固結(jié)速率的影響。最后，將不排水懸浮樁復(fù)合地基的加固區(qū)簡化為下臥層的半透水邊界，給出了半透水邊界厚度的計算公式，建立了下臥層固結(jié)度的簡化計算方法。
[Abstract]:Consolidation theory of composite foundation is an important part of composite foundation theory. However, the consolidation calculation of undrained pile (such as cement soil pile) composite foundation is seldom studied. It has important theoretical significance and practical application value to further study this subject. This paper is of great value to the composite of undrained suspended pile. The analytical theory of foundation consolidation is analyzed and studied. The main tasks are as follows:. 1. The consolidation characteristics of undrained suspension pile composite foundation are simulated and analyzed by using Plaxis finite element analysis software, which lays a foundation for the establishment of consolidation analytical solution of undrained suspension pile composite foundation. 2. On the basis of the assumption of equal strain, the consolidation equations of soil between piles and substratum soil in the consolidation zone of undrained suspended pile composite foundation under instantaneous loading are derived. On the basis of the consolidation theory of double-layer foundation, An analytical solution of consolidation of composite foundation with undrained suspended pile is established, including the solution of consolidation degree of composite foundation according to the definition of settlement and pore pressure, respectively. According to the analytical solution of consolidation degree of composite foundation, the relative reinforcement depth is analyzed. The effect of replacement rate and the ratio of soil modulus between pile and pile on consolidation rate of composite foundation. 3. The analytical solutions of the consolidation of soil between piles and subsoil in the consolidation zone of undrained suspended pile composite foundation are established respectively. The effects of replacement rate and ratio of modulus of pile to soil on the consolidation rate are analyzed. The consolidation zone of undrained suspended pile composite foundation is simplified as the semi-permeable boundary of the underlying layer. The formula for calculating the thickness of the semi-permeable boundary is given, and the simplified calculation method for the consolidation degree of the underlying layer is established.
【學(xué)位授予單位】：上海理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU470

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本文編號：1554890