- 摘 要
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(1 東華理工大學(xué)建筑工程學(xué)院， 南昌 330013； 2 江西中恒建設(shè)集團， 南昌 330013)
［摘要］為研究預(yù)制樁樁身表面粗糙度和樁端條件對單樁承載特性的影響，預(yù)制了6種不同樁身粗糙度的樁，在室內(nèi)進行了黏土中純摩擦樁和摩擦端承樁的試驗。試驗結(jié)果表明：預(yù)制樁在黏土層中樁身表面粗糙度越大,其極限承載力越高；相同粗糙度不同樁端條件的樁，在荷載較小時荷載-沉降曲線基本重合，隨著荷載的增大，相同荷載下，摩擦端承樁的樁頂沉降量小于純摩擦樁的樁頂沉降量；在樁端處純摩擦樁的側(cè)摩阻力急劇減小而摩擦端承樁的側(cè)摩阻力有所增強，經(jīng)對這種現(xiàn)象分析認為，在摩擦端承樁中樁端處土體有擠壓效應(yīng)而使此處的側(cè)摩阻力增大，在純摩樁中，樁端底部是空的，樁土在樁端處相互作用較小而導(dǎo)致此處側(cè)摩阻力減小。
［關(guān)鍵詞］模型試驗； 黏土； 粗糙度； 樁側(cè)摩阻力； 樁端阻力
中圖分類號：TU473文獻標識碼：A文章編號：1002-848X(2020)11-0114-05
Experimental study on impact of surface roughness of pile body in clay on bearing capacity of single pile
ZHENG Zhihong1, LIANG Haian1, YANG Zeping1, ZHANG Minsi1, YANG Yong1, LIU Xiangang2
(1 School of Civil and Architecture Engineering, East China University of Technology, Nanchang 330013, China; 2 Jiangxi Zhongheng Construction Group， Nanchang 330013， China)
Abstract:In order to study the influence of the surface roughness of the prefabricated pile body and the pile tip conditions on the bearing characteristics of a single pile, 6 kinds of piles with different body roughness were prefabricated, and the tests of pure friction piles and friction end bearing piles in clay were performed indoors. The test results show that the larger the surface roughness of the precast pile in the clay layer is, the higher its ultimate bearing capacity is; the piles with the same roughness and different pile tip conditions, the load-settling curves basically coincide when the load is small, and the pile top settlement of the friction end bearing pile is smaller than that of the pure friction pile under the same load; at the pile tip, the side friction of pile of the pure friction pile decreases sharply and the side friction of pile of the friction end bearing pile is slightly reinforced. According to the analysis of this phenomenon, it is believed that the soil at pile tip in the friction end bearing pile has a squeezing effect, which increases the side friction of pile here. In a pure friction pile, the bottom of the pile tip is empty, and the pile-soil interaction at the pile tip is relatively small, resulting in a reduction in side friction of pile here.
Keywords:model test; clay; roughness; side friction of pile; pile tip resistance
*國家重點研發(fā)計劃（2016YFC0800205），國家自然科學(xué)基金項目（51438004），核資源與環(huán)境重點實驗室開放基金項目（NRE1325），江西省科技支撐計劃（20151BBG70004），東華理工大學(xué)校企合作項目（ZR2015000022）。
作者簡介：鄭志洪，碩士，Email:hongzz91@163.com。
