【摘要】：PHC管樁作為提高地基承載力、滿足特大工程的需要在我國越來越應(yīng)用廣泛。但由于PHC管樁樁土相互作用的復(fù)雜性，理論研究還不成熟，這就需要工程界不斷提出新問題，，解決新問題，使理論日益完善，為工程實踐更好的服務(wù)。本文以理論研究為基礎(chǔ)，結(jié)合工程實例，利用FLAC3D軟件對靜載作用下PHC管樁樁土相互作用的承載特性及相關(guān)影響因素進行研究，主要的研究成果如下： （1）介紹了PHC管樁樁土相互作用的發(fā)展及應(yīng)用現(xiàn)狀，并對PHC管樁樁土相互作用的現(xiàn)場試驗研究、理論分析研究及數(shù)值模擬研究等研究方法進行歸納和總結(jié)。 （2）概括了靜載作用下PHC管樁樁土相互作用承載特性的基本理論，介紹了影響單樁荷載傳遞的因素，并對時間效應(yīng)、擠土效應(yīng)、土塞效應(yīng)及單樁的破壞形式做了簡單的介紹。 （3）根據(jù)FLAC3D軟件的基本知識，利用FLAC3D軟件，結(jié)合工程實例，對靜載作用下PHC管樁樁土相互作用承載特性進行模擬，并對計算結(jié)果進行對比分析，進而說明了在靜載作用下用FLAC3D軟件模擬PHC管樁樁土相互作用的承載特性是可行的，為研究相關(guān)影響因素提供了依據(jù)；通過規(guī)范解與模擬值進行比較，得出了根據(jù)規(guī)范設(shè)計的PHC管樁是比較保守的，考慮樁土相互作用，利用修正的單樁極限承載力公式計算的結(jié)果與模擬值基本吻合，為PHC管樁在設(shè)計、實際施工及檢測中，提供可靠的參考。 （4）分別取不同接觸面參數(shù)、不同樁徑、不同樁長、不同土的彈性模量、不同樁的彈性模量等影響因素在靜載作用下對PHC管樁樁土相互作用進行模擬并對其進行分析，結(jié)果表明改變接觸面參數(shù)、改變樁徑、改變樁長對PHC管樁樁土相互作用的影響很明顯，而改變土的彈性模量和樁的彈性模量對PHC管樁樁土相互作用的影響不明顯。在實際工程中，可適當(dāng)?shù)耐ㄟ^改變樁徑、樁長及樁土接觸面參數(shù)來完善對PHC管樁的優(yōu)化設(shè)計，以達(dá)到節(jié)約成本的目的。
[Abstract]:PHC pipe pile is more and more widely used in our country to improve the bearing capacity of foundation and to meet the needs of large projects. However, due to the complexity of the interaction of PHC pipe, pile and soil, the theoretical research is still immature, which requires the engineering community to constantly put forward new problems, solve new problems, make the theory more perfect, and serve engineering practice better. On the basis of theoretical research and combined with engineering examples, this paper studies the bearing characteristics and related influencing factors of PHC pile-soil interaction under static load by using FLAC3D software. The main research results are as follows: (1) the development and application of PHC pipe pile-soil interaction are introduced, and the field test of PHC pipe pile-soil interaction is studied. The theoretical analysis and numerical simulation are summarized. (2) the basic theory of PHC pile-soil interaction under static load is summarized, and the factors influencing the load transfer of single pile are introduced. The time effect, soil squeezing effect, soil plug effect and the failure form of single pile are simply introduced. (3) according to the basic knowledge of FLAC3D software, using FLAC3D software, combined with engineering examples, The load-bearing characteristics of PHC pipe pile-soil interaction under static load are simulated, and the calculated results are compared and analyzed. The results show that it is feasible to simulate the bearing characteristics of PHC pipe pile-soil interaction by using FLAC3D software under static load. The results show that the design of PHC pipe pile according to the code is conservative, and the interaction between pile and soil is considered. The calculated results of the modified formula for the ultimate bearing capacity of single pile are in good agreement with the simulated value, which provides a reliable reference for the design, practical construction and inspection of PHC pipe pile. (4) different contact surface parameters and different pile diameters are taken separately. The influence factors such as different pile length, different soil elastic modulus and different pile elastic modulus are simulated and analyzed under static load. The results show that the contact surface parameters are changed and the pile diameter is changed. The influence of changing pile length on the pile-soil interaction of PHC pipe is obvious, but the influence of changing the elastic modulus of soil and the elastic modulus of pile on the pile-soil interaction of PHC pipe is not obvious. In practical engineering, the optimization design of PHC pipe pile can be improved by changing pile diameter, pile length and pile-soil contact surface parameters, in order to achieve the purpose of saving cost.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU473.1

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