微型桩与部分预应力复合土钉变形因素分析  

Analysis of factors on deformation of micro-pile & pretressed soil nailing

作　　者：陈启辉[1] 宋金平[1] 江宗宝 郭道通 

机构地区：[1]山东建筑大学建筑结构鉴定加固与改造山东省重点实验室,山东济南250101 [2]山东建大工程鉴定加固研究所,山东济南250014

出　　处：《山东建筑大学学报》2010年第3期236-239,共4页Journal of Shandong Jianzhu University

基　　金：建设部科技计划项目(05-K1-14)

摘　　要：微型桩和部分预应力复合土钉支护是近年来出现的一种新型基坑围护结构,已得到广泛应用。本文运用显式差分有限差分软件FLAC-3D分析了土钉长度、土钉倾角、微型桩间距、微型桩嵌固深度及土钉预应力支护参数对复合土钉支护变形的影响,并用正交试验方法分析了各影响因素对变形的敏感度。结果表明:适当增加土钉长度、控制微型桩间距、增大微型桩的嵌固深度能控制支护结构变形,增加土钉预应力对减小支护变形效果明显,同时土钉预应力大小对支护变形的影响最大,而土钉倾角的影响最小。Micro-pile pretressed soil nailing is a new support structure which is widely used.In this article,with FLAC-3D software,the influencing factors on deformation of composite soil nailing are discussed,such as the nail length,angle of soil nail,micro-pile spacing,the embedded length of micro-pile and soil nail prestress.Also dealt with is the deformation sensitivity to the discussed factors with the orthogonal test.The result shows that deformation of support structure can be controlled by increasing proper soil nail length,controlling micro-pile spacing,increasing the embedded depth of micro-pile.The effect of reducing support deformation is obvious by increasing soil nail prestress,and deformation of support is most influcenced by soil nail prestress,but is least influcenced by angle of soil nail.

关 键 词：复合土钉支护 侧向变形 数值模拟 正交试验 

分 类 号：TU432[建筑科学—岩土工程]