岩土力学2012，Vol.33Issue(10)：2881-2889,9.
超大面积深厚软土桩-网复合地基现场试验研究
Field test study of pile-net composite foundation on oversized deep soft soil
摘要
Abstract
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.关键词
现场试验/深厚软土/桩-网复合地基/工作机制Key words
field test/ deep soft soil/ pile-net composite foundation/ work mechanism分类
建筑与水利引用本文复制引用
于进江,程谦恭,李成辉,文华..超大面积深厚软土桩-网复合地基现场试验研究[J].岩土力学,2012,33(10):2881-2889,9.基金项目
国家自然科学基金项目(No.41172260,No.51108393) （No.41172260,No.51108393）
高等学校博士学科点专项科研基金(No.20110184110018) （No.20110184110018）
国家重点基础研究发展计划(973计划)(No.2008CB425801) （973计划）
四川省教育厅科研项目(No.09ZC108). （No.09ZC108）
