【摘要】：在普灣新區(qū)的建設(shè)過(guò)程中,工程中遇到了比較復(fù)雜的地質(zhì)條件,在這種情況下,普通的預(yù)制樁和灌注樁達(dá)不到承載力的要求,根據(jù)這種情況,工程上采用了一種新型的樁,即載體樁。載體樁和一般的樁基存在著較大的不同,載體樁是一種典型的端承樁,主要靠樁端承受荷載,樁端所承受的荷載占整個(gè)樁所承受的荷載的80%以上,載體樁更不同于擴(kuò)底樁,載體樁的施工過(guò)程中,在形成載體的過(guò)程中,加入一些高強(qiáng)度的碎石塊等等,然后進(jìn)行強(qiáng)夯,形成致密的結(jié)構(gòu),進(jìn)而形成擴(kuò)大的載體結(jié)果。它的受力機(jī)理和一般的樁基礎(chǔ)存在著較大的差別。鑒于這種情況,本文展開(kāi)了這項(xiàng)研究。從現(xiàn)場(chǎng)的試驗(yàn)中,得到了載體樁的Q-s曲線,并且對(duì)載體樁的極限承載力給出了值,根據(jù)Q-s曲線,可以為下文的ABAQUS數(shù)值模擬做出較好的校驗(yàn)。根據(jù)規(guī)范,對(duì)載體樁的極限承載力特征值進(jìn)行計(jì)算,得出的值比現(xiàn)場(chǎng)試驗(yàn)的數(shù)值要小,這是合理的,因?yàn)橐?guī)范所算出來(lái)的數(shù)據(jù)是保守的,再根據(jù)規(guī)范,得出同等條件下灌注樁的承載力,載體樁的極限承載力是灌注樁的3倍多,可見(jiàn),載體樁使樁基礎(chǔ)的承載力大大提高。除此之外,利用規(guī)范對(duì)載體樁的載體的直徑進(jìn)行估算,為下一章的模擬做好數(shù)據(jù)準(zhǔn)備,最后對(duì)載體樁的最優(yōu)樁距進(jìn)行了研究,得出了合理的樁距,并且和工程的建筑施工圖比較吻合。在Q-s曲線上,本文運(yùn)用ABAQUS軟件進(jìn)行模擬,建立兩個(gè)模型,即載體樁和普通的灌注樁,它們基于同等的條件下,地質(zhì)條件相同,樁徑的大小也一樣,唯一的區(qū)別是載體樁有載體這一部分。通過(guò)模擬,分別得到兩種不同的沉降曲線,根據(jù)現(xiàn)場(chǎng)試驗(yàn)和其他的大量的試驗(yàn),發(fā)現(xiàn)載體樁的Q-s曲線是緩變型。在受力機(jī)理上,載體樁的受力情況和普通的灌注樁存在著較大的差別,在載體樁載體的周?chē)馏w上,應(yīng)力呈現(xiàn)出比較均勻的分布,普通灌注樁周邊存在著應(yīng)力集中的現(xiàn)象,這一點(diǎn)使整個(gè)受力體系存在著較大的差別。最后,本文對(duì)載體樁的Q-s曲線進(jìn)行了曲線擬合,得出公式：y=1-e-Ax A∈(-0.00133,0.00108),可以作為簡(jiǎn)單的公式用于現(xiàn)場(chǎng)的設(shè)計(jì)和施工。
[Abstract]:In the process of construction of Puwan New area, complex geological conditions have been encountered in the project. In this case, ordinary precast pile and cast-in-place pile can not meet the requirements of bearing capacity. According to this situation, a new type of pile is adopted in the project. That is, the carrier pile. There is a great difference between the carrier pile and the general pile foundation. The carrier pile is a typical end-bearing pile, which mainly depends on the load at the end of the pile. The load on the pile end accounts for more than 80% of the load borne by the whole pile, and the carrier pile is different from the extended pile. In the construction process of the load pile, in the process of forming the carrier, some high strength broken stones and so on are added, and then the dynamic compaction is carried out to form the dense structure, and then the expanded carrier result is formed. There is a great difference between its stress mechanism and the general pile foundation. In view of this situation, this paper carries out this study. From the field test, the Q 鈮，

本文編號(hào)：2488126