钙质砂地基中桶形基础水平动载响应实验研究  

EXPERIMENTAL STUDY ON BUCKET FOUNDATIONS’ RESPONSES IN CALCAREOUS SAND UNDER DYNAMIC LOAD

作　　者：王丽[1] 鲁晓兵[1] 时忠民 

机构地区：[1]中国科学院力学研究所,北京100190 [2]中海石油研究中心,北京100027

出　　处：《工程力学》2010年第2期193-203,共11页Engineering Mechanics

基　　金：国家重点基础研究专项基金项目(2001CB409603);中科院;中海油联合重大项目(KJCX2-SW-L03-01)

摘　　要：针对钙质砂地基中桶形基础动态响应问题进行了实验研究。首先进行了水平静极限承载力实验,获得了水平载荷位移曲线,并为确定水平动载荷幅值的选择提供参考;然后针对主要因素,包括桶形基础尺寸、载荷幅值和频率、土体密度、压重等,进行了系列的室内小模型实验,并对结果进行了分析,获得了水平动载下桶形基础在钙质砂地基中的响应特点。结果表明:载荷幅值、频率、土体密度、桶形基础尺寸对动态响应有明显影响;动载下桶形基础周围钙质砂中孔压上升,但是较其他类砂土中的慢;在结构重量小时,桶形基础上升;有上覆较硬粘土层时,桶形基础和地基的响应减弱。This paper performs experimental study on responses of the bucket foundations in calcareous sand layers under dynamic loading. Experiments to determine the horizontal static bearing capacity are carried out first. The obtained static loading-displacement curves can be referred to for determining the amplitudes of dynamic loads. Then a series of experiments are conducted to study the influences of some factors including the size of bucket, the amplitude and frequency of load, the density of soils, pressing load etc.. Analyzing experimental results, the responses＇ characteristics of bucket foundations in calcareous sand under horizontal dynamic loads are obtained. It is shown that 1） the amplitude and frequency of loading, the soil density and the size of bucket foundation influences the dynamic responses of the bucket foundation obviously; 2） the pore pressure increases under dynamic loading, but the rate is smaller than that in other type of sand; 3） the bucket foundation would rise if the structure＇s weight is small; 4） the dynamic responses of the bucket foundation and the soil layer decreases with an overlayer of stiff clay covering.

关 键 词：钙质砂 桶形基础 水平动载荷 承载力 动态响应 

分 类 号：TU441[建筑科学—岩土工程] TU411.8[建筑科学—土工工程]