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超大面积深厚软土桩-网复合地基现场试验研究

ISSN号：1000-7598
期刊名称：岩土力学
时间：2012.10.10
页码：2881-2889
分类：TU431[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]西南交通大学土木工程学院,成都610031, [2]中铁十九局集团有限公司,广东辽阳111000, [3]西南科技大学土木工程与建筑学院,四川绵阳621010
相关基金：国家自然科学基金项目（No.41172260,No.51108393）; 高等学校博士学科点专项科研基金（No.20110184110018）; 国家重点基础研究发展计划（973计划）（No.2008CB425801）; 四川省教育厅科研项目（No.09ZC108）
相关项目：高速远程滑坡-碎屑流“裹气流态化”减阻机理研究

关键词：现场试验, 深厚软土, 桩-网复合地基, 工作机制, field test, deep soft soil, pile-net composite foundation, work mechanism

中文摘要：

结合潮汕车站软基处理工程设置监测断面,埋设相关监测仪器,对桩-网复合地基上部路堤填土施工过程中地表沉降、深部分层沉降、深部水平位移、桩顶应力、桩间土应力、土工格栅伸长量等的变化进行观测分析,结果表明,在加载初期,桩间土和桩顶土的应力都存在一个迅速增大的过程,但桩顶土应力增大的速率要大于桩间土应力增大的速率;当填土达到一定高度时,桩间土应力出现极值,产生的土拱效应会使4桩中心处的应力小于2桩中心处的应力值;管桩的轴力、摩阻力和地层情况密切相关,且均随时间、荷载的增加而增大;地基分层沉降的速率与路堤填土的速率呈正相关,沉降量的大小与地层深度和地层特征有关;土工格栅的拉伸位移量随着填土高度的增加而增加,且其增长速率经历了由慢到快再到缓的过程;地基水平位移随荷载的增加而增大,随深度增加而减小,管桩有效地限制了地基的水平位移。

英文摘要：

Based on the treatment of soft foundation in Chaoshan railway station,monitoring sections and instruments are selected and embedded respectively for observing surface settlement,deep layered settlement,deep horizontal displacement,stress among pile spacing,and extension length of geogrid,etc.The results show that at the beginning of loading,stresses of both soil among piles and pile top will increase rapidly for a while;but the varying speed of stress on pile top is larger than that among pile spacing.When the filling hits a certain height,stress among pile spacing reaches extreme value;the occurring arch effect will make the central stress of four piles become less than that of two piles;the axial force and the side friction of pipe pile have close relationship with the stratum situation and raise along with the passing of time and growth of loadings;the layered settlement of foundation has positive correlation with the speed of embankment fillings;and the settlement value is related to depth and property of stratum.The tension displacement of geogrid ascends with the increment of filling height;and its increasing velocity undergoes a process of first slow then drastic and calm at last.The lateral displacement of embankment grows up with the increment of loadings and decreases along depth,and is effectively controlled by pipe piles.

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