砂类土层中地下结构浮力的模型试验

Model test of buoyancy for underground structure in sandy-soil stratum

通过模型试验的方法,对砂土地基中地下水浮力的力学效应进行分析,探讨了不同孔隙率下地下水浮力的变化规律和地下建筑结构所受浮力随水位的动态变化过程.试验结果表明:随着水位增加,水浮力呈现增长趋势,砂土地基孔隙率的大小对地下水的浮力未见明显影响,说明规范中规定,对砂类土层中按静水压力计算地下工程所受浮力是可行的.

This paper analyzes the mechanical effects of underground water buoyancy in the sand foundation by model test, and it mainly discusses the changing rules of the underground water buoyancy under different porosi- ty and the dynamic changing process of the underground structure under effect of the buoyancy. The results indi- cate that the water buoyancy tends to rise with the water level increasing, the magnitude of the porosity shows no obvious effect on the underground water buoyancy, which proves in standard that it is feasible to calculate the buoyancy of underground engineering by using hydrostatic pressure in sand soil.