摘要
根据塔克拉玛干沙漠腹地2个装配式基础的现场试验，分析了下压与水平力组合荷载作用下风积砂地基装配式基础的变形、结构受力特性以及地基土压力变化规律，并采用Veisc理论计算了下压与水平力组合荷载作用下风积砂地基的极限承载力。结果表明，在下压水平力组合荷载作用下：1）风积砂地基装配式基础顶部竖向和水平方向的位移值相差不大。基础顶部竖向沉降主要由支架压缩量和地基沉降量组成，在极限荷载工况时，角钢支架变形量为风积砂地基沉降量的2倍～3倍，最终是由于地基的水平承载力不足而使得基础丧失承载能力；2）角钢支架处于压弯受力状态，在破坏荷载时，尚未达到角钢屈服应力，也未出现压曲失稳；3）风积砂地基装配式基础的承载性能与基础底板混凝土板条的排列方式有关，平行于混凝土板条轴线方向的水平承载能力高：4）可采用Vesic理论计算风积砂地基装配式基础在倾斜荷载作用下的竖向下压极限承载力。
In order to obtain the performance of assembly foundations composed of the concrete footing slabs and steel angle columns, which were used for the transmission line engineering in Taklimakan desert, the two field tests of assembly foundations subjected to compression and horizontal combination loads were carried out. The load-displacement both of footing slabs and of foundation top plane, the soil pressure acted on the footing slabs and the stress of the steel angle column were all measured. Under the oblique load, there was no obvious difference among the displacements on foundation top in three directions. The displacement of foundation top plane was mainly made up of the deflection of a steel angle column and that of the aeolian sand subgrade. The displacement value of the steel angle column was 2-3 times of the mean of the aeolian sand. The stress of the steel angle columns did not reach the yield point and buckling strength. The load-carrying property of the foundation was related to the layout of footing slabs. The bearing capacity against overturning of an assembly foundation was weak because of its slight dead weight and the low soil pressure of aeolian sand acted on the steel angle columns. The bearing capacity against overtuming in the in the axial direction of the footing slab was higher than that of the opposite. The ultimate compression load of the tests verified the Vesic theory to determine the ultimate compression load when the foundations were subjected to an oblique load in aeolian sand in Taklimakan desert.
出处
《工程力学》
EI
CSCD
北大核心
2012年第6期133-137,195,共6页
Engineering Mechanics
基金
中央高校基本科研业务费专项资金项目(2010ZY49)
关键词
风积砂地基
装配式基础
组合荷载
承载性能
变形特性
aeolian sand
assembly foundation
combined load
load bearing properties
deformation behavior
