模拟桩端为岩层的刚性桩复合地基承载性状试验研究  

Experimental Study on Bearing Characteristics of Rigid Pile Composite Foundation on the Rock

作　　者：张东刚[1] 张震[1] 马骥[1] 李涛[1] 李帅[1] 谷二永[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《建筑科学》2016年第1期29-36,共8页Building Science

基　　金：住房和城乡建设部研究开发项目(课题基金号:2011-K3-40)

摘　　要：刚性桩复合地基具有提高承载力幅度大、控制变形能力强等优点,在工程实践中得到广泛应用。工程实践表明,在岩层埋置较浅的地区,也可采用刚性桩复合地基技术来提高地基的承载力。然而,由于桩端为岩层的刚性桩复合地基的理论研究较少,对该类刚性桩复合地基桩端持力层的选择存在不同认识。针对该问题,本文选用桩端为岩层的刚性桩与不同厚度褥垫层进行复合地基的承载特性试验研究。通过试验结果分析,证明了褥垫层对于刚性桩和土的荷载分配调节能力很强,通过合理设置褥垫层,能够使桩端为岩层的桩间土承载力得到发挥,保证桩土共同作用,从而使刚性桩与桩间土构成复合地基。本文研究成果可以深化人们对刚性桩复合地基的理论认识,为桩端为岩层的地质情况下选用刚性桩复合地基提供技术支持。The rigid pile composite foundation can greatly improve the bearing capacity and has high ability to control the deformation,so it has been widely used in engineering practice. The engineering practice shows that the rigid pile composite foundation can be used to improve the bearing capacity in the areas with shallow-buried rock.However,there are different opinions on the selection of the bearing stratum of the rigid pile composite foundation in domestic academic circle because of the lack of relevant theoretical researches. In order to solve the issues above,the laboratory model tests are carried out to study the bearing characteristics of composite foundation on the rock with different cushion thicknesses. The results show that the cushion can effectively adjust the pile-soil load sharing,and the bearing capacity of soil between the piles can be made full use of by setting cushion with reasonable thickness on the pile top. Therefore,the composite foundation could be formed by the pile and soil between the piles. The research results could deepen the understanding the theory of composite foundation and provide technical supports for the use of rigid pile composite foundation.

关 键 词：复合地基 刚性桩 岩层 模型试验 承载力 

分 类 号：TU473.11[建筑科学—结构工程]