摘要
针对竖向循环荷载作用下软土地基桶形基础的承载特性进行模型试验。首先,采用真空预压的方法制备模型土池,通过土的物理性试验和不固结不排水三轴压缩试验测得土池中土的基本物理力学性质;然后,在确定桶形基础竖向静承载力的基础上进行循环荷载试验,在不同动静荷载组合作用下观测地基的破坏特性,记录循环累积变形与循环振次的关系。结果表明,模型槽内不同位置不同深度土的基本物理力学性质指标相差不大,真空预压制备土池的方法可行;桶形基础在循环荷载作用下的产生的累积变形与蠕变过程相似;软土地基桶形基础的循环承载特性与动、静荷载水平有较大的关系,在其应用过程中要综合考虑动、静荷载作用。
The model test is carried out to study the bearing characters of the bucket foundation on soft clay strata under vertical cyclic loads.Firstly,we prepared model soil tank using vacuum preloading method,and gained the soil＇s physical and mechanical characteristics by physical and unconsolidated undrained triaxial tests.Secondly,by vertical cyclic model tests after assessing the static bearing capacity of the bucket foundation,we studied its failure characters under different static and cyclic loads and recorded the relationship between the cyclic cumulative deformation and the number of cycles.It is concluded that little difference occurred in the physical and mechanical characteristics of soil in the different part of the tank,so the vacuum preloading method for preparing the soil tank is valid.The cyclic cumulative deformation generated by cyclic loads was similar to the creep and the cyclic bearing characters of the bucket foundation was related to the dynamic and static load stages,so it becomes important to consider them comprehensively during the application of the bucket foundation.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第3期477-480,共4页
Chinese Journal of Underground Space and Engineering
关键词
桶形基础
循环累积变形
模型试验
蠕变
bucket foundation
cyclic cumulative deformation
model test
creep
