【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(shí)踐更好的服務(wù)。本文以理論研究為基礎(chǔ)，結(jié)合工程實(shí)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(jìn)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(yàn)研究、理論分析研究及數(shù)值模擬研究等研究方法進(jìn)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(shí)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(shí)例，對靜載作用下PHC管樁樁土相互作用承載特性進(jìn)行模擬，并對計(jì)算結(jié)果進(jìn)行對比分析，進(jìn)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(jìn)行比較，得出了根據(jù)規(guī)范設(shè)計(jì)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(jì)算的結(jié)果與模擬值基本吻合，為PHC管樁在設(shè)計(jì)、實(shí)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(jìn)行模擬并對其進(jìn)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(shí)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(jì)，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

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鄒春華;王長丹;代仁平;計(jì)招紅;;一種改進(jìn)的單樁計(jì)算彈性理論法[J];城市道橋與防洪;2009年10期

2 高倚山,張劍鋒;高強(qiáng)度預(yù)應(yīng)力管樁(PHC樁)在電力工程中的應(yīng)用[J];電力勘測;2001年02期

3 張鶴年;宰金珉;;考慮上部結(jié)構(gòu)的樁筏基礎(chǔ)非線性共同作用分析[J];工程地質(zhì)學(xué)報(bào);2006年04期

4 郭宏磊,賀雯,胡亦兵,王元漢;PHC樁的豎向極限承載力的預(yù)測[J];工程力學(xué);2004年03期

5 于景操;楊成斌;;靜壓PHC管樁現(xiàn)場靜載試驗(yàn)分析[J];工程與建設(shè);2012年01期

6 劉金燕;;剪切位移法在分層地基模型中的應(yīng)用[J];甘肅科技;2010年06期

7 戴民;周云東;張霆;;樁土相互作用研究綜述[J];河海大學(xué)學(xué)報(bào)(自然科學(xué)版);2006年05期

8 金舜,匡紅杰,周杰;我國預(yù)應(yīng)力混凝土管樁的發(fā)展近況和方向[J];混凝土與水泥制品;2004年01期

9 趙明華,胡志清;預(yù)估試樁極限承載力的調(diào)整雙曲線法[J];建筑結(jié)構(gòu);1995年03期

10 許國平;靜壓PHC樁荷載傳遞的試驗(yàn)研究[J];建筑結(jié)構(gòu);2005年07期

本文編號：2237045