垫层厚度对长短桩复合地基性状影响的试验研究  

Model Test Study on the Impact of Cushion Thickness on the Long-short Piles Composite Foundation

作　　者：葛忻声[1] 饶江勇[1] 黄新恩[2] 李斌[1] 陈东佐[3] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024 [2]中北大学后勤处,太原030051 [3]太原大学建筑工程系,太原030009

出　　处：《太原理工大学学报》2010年第3期265-268,共4页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(50678110);山西省自然科学基金资助项目(2007011069);太原市大学生创新创业资助项目(09122006)

摘　　要：为了研究垫层厚度对长短桩复合地基工作性状的影响,在室内模型试验的基础上,对无垫层2、cm垫层和5 cm垫层三种情况下长短桩复合地基的荷载与沉降的关系、桩土应力比、荷载分担比等问题进行了分析,结果表明,长短桩复合地基的沉降量随着垫层厚度的增加而增加;长桩桩土应力比随垫层厚度的增加而减小,短桩桩土应力比的变化不如长桩明显;无垫层时,长桩荷载分担比较大,桩间土和短桩荷载分担比很小,铺设垫层后,随垫层厚度的增加,长、短桩荷载分担比都逐渐减小,桩间土荷载分担比逐渐增大。In order to study the impact of cushion thickness on the long-short piles composite foundation,the relation between bearing capacity and settlement, pile-soil stress ratio, and load sharing ratio were studied on the basis of laboratory tests in three different conditions.no cushion,2 cm-thick cushion and 5 cm-thick cushion. Conclusions are as follows, the settlement of long-short piles composite foundation increased with increasing cushion thickness; the pile-soil stress ratio of long pile decreased with increasing cushion thickness while the pile-soil stress ratio of short pile changed little; without custion the load sharing ratio of long piles was larger than that of short piles and soil, while with increasing cushion thickness, the load sharing ratio of long and short piles became smaller while that of soil became larger.

关 键 词：垫层 长短桩复合地基 模型试验 

分 类 号：TU473[建筑科学—结构工程]