基于载荷试验的多桩型复合地基的概念设计方法  

METHOD OF CONCEPTUAL DESIGN OF COMPOSITE FOUNDATION WITH MULTI TYPE PILES BASED ON STATIC LOADING TEST

作　　者：黄文德[1,2] 党发宁[1] 肖耀廷[1] 

机构地区：[1]西安理工大学岩土工程研究所,西安710048 [2]渭南职业技术学院,陕西渭南714000

出　　处：《工业建筑》2015年第12期110-115,共6页Industrial Construction

基　　金：水利部公益性行业科研专项(201201053-03);陕西省黄土力学与工程重点实验室重点科研计划项目(09JS103)

摘　　要：通过分析影响复合地基桩土应力的因素,指出复合地基的桩土应力与垫层刚度、桩间土刚度、桩刚度的大小有关。从荷载试验应力-变形曲线入手,利用荷载试验能从宏观上反映桩土相互作用的特点,提出考虑垫层刚度、桩间土刚度、桩刚度的多桩型复合地基桩土应力的计算方法;指出多桩型复合地基设计应将主;辅桩设计为两道防线,主桩为第一道防线,主要目的是减小复合地基沉降,设计时宜采用刚度较大的桩体;辅桩为第二道防线,主要保证复合地基的安全度、调整主桩的应力,设计时宜采用柔性桩或者刚度较小的桩。垫层厚度的调整对桩土应力影响较大,但对应力发挥顺序影响不大。通过分析得到:多桩型复合地基的设计应全面看待各刚度的影响,根据实际问题,调整主、辅桩和土的刚度以及垫层的厚度。后续研究应集中在建立合理的复合地基的评价机制上。First,the influencing factors on pile-soil stress of composite foundation were analyzed,the results showed the stiffness of cushion,soil,and pile affected pile-soil stress. Secondly,a calculation method of pile-soil stress of composite foundation with multi type piles that considered the stiffness of cushion,soil,and pile,was presented according to stress-deformation curve of static loading test which had advantage of considering multiple factors. The composite foundation with multi type piles should have two lines of defence,the first line of defence,main pile with larger rigidity could reduce settlement,the second line of defence,auxiliary pile with small rigidity could ensure the safely of foundation and adjust stress of the main pile,the thickness of cushion had greater influence on pile-soil stress,but had less influence on stress to play successively. Last,design of composite foundation with multi type piles should be kept in perspective,follow-up research should concentrate on building evaluation mechanism of composite foundation.

关 键 词：多桩型复合地基 载荷试验 桩土应力 概念设计 

分 类 号：TU47[建筑科学—结构工程]