托换桩-土钉墙组合支护结构的工作机制初探  

Study of working mechanism of composite supporting structure with underpinning piles and soil nailing

作　　者：魏焕卫[1] 张勇 

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东省物化探勘查院,济南250014

出　　处：《岩土力学》2013年第S2期278-284,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.41272281);山东省自然科学基金资助(No.ZR2012EEM016);山东建筑大学博士基金资助(No.XNBS1206)

摘　　要：针对新型托换桩-土钉墙组合支护结构,假定沉降大于托换桩沉降范围内的坡顶建筑物荷载全部转移至托换桩,阐述托换桩-土钉墙组合支护的工作机制,对支护结构的变形协调机制和荷载传递路径进行探讨,提出支护结构侧向变形、坡顶沉降以及托换桩沉降及内力的计算方法。参数及对比分析表明,相对传统的复合土钉墙支护,新型托换桩-土钉墙组合支护结构可以很明显地减小支护结构的变形和内力,随坡顶荷载的增加托换支护法中支护结构的内力和变形的增速明显小于复合土钉墙的内力和变形增速,随微型桩水平间距的增加支护结构的变形和内力都增加,微型桩嵌固深度的增加对支护结构的内力和变形影响较小。Underpinning pile-soil nailing (UPSN), a composite structure of underpinning piles and soil nailing, is a new retaining technology. Base on the hypothesis that the underpinning pile top load is equal to the upper structural load with its settlement greater than that of the underpinning pile top, the retaining characteristics of UPSN are analyzed; and its deformation coordination mechanism and load transfer path are discussed. The computing methods of lateral deformation, vertical settlement and inner force are proposed. Parametric analysis shows that UPSN can obviously reduce the deformation and internal force of supporting structure compared to conventional composite soil nailing; the deformation and internal force increases as the upper structural load and horizontal spacing of the micro-pile increases;less affect as the embedded depth of micro pile increases.

关 键 词：托换桩 土钉墙 侧向变形 沉降 变形协调 

分 类 号：TU476[建筑科学—结构工程]