地下建筑物的扬压力计算

扬压力是影响建筑物特别是地下建筑物稳定的重要荷载。对于土基上的扬压力计算,传统算法是把建筑物基底面看作是扬压力的作用面,不考虑土体颗粒同基底面相接触而造成的扬压力的减小。对于黏性土地基,可以引入平面有效空隙率的概念,这样计算的基底扬压力值比常规算法的结果要小,从而可以在安全的前提下有效地节约工程投资。

Uplift pressure on underground hydraulic structures

The uplift pressure is one of the main factors that influence the stability of underground structures.For the calculation of uplift pressure on clay foundation,traditional method considers that the uplift pressure works on the whole area of the base.It does not give considerations of pressure decreasing caused by the close contact between clay particles and the base.Through detailed analysis,the present article considers that:for clay foundation,the concept of effective sectional void ratio can be introduced.Hence,the value of uplift pressure is smaller than those calculated by traditional methods,which can save the investment of the projects under the circumstance of safety.