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对于上层为硬粘土层下层为海相、河相沉积的软粘土层的地基结构,在我国滨海一带分布很广。由于近年来城市向高空发展,高层建筑兴起,上部荷载大大增加,建立在这种地基上的基础,由于下层软粘土的抗剪强度低,渗透系数很小(K=10~(-7)~10~(-9)厘米/秒),粘度系数很低(η=10~(-10)~10~(13)泊),含水量高,固结以后的力学性质变化很大,
The foundation structure of the soft clay layer where the upper layer is a hard clay layer and the lower layer is a river layer and a river deposit is widely distributed in coastal areas of China. As cities have developed to high altitudes in recent years, high-rise buildings have risen, and the load on the upper part has greatly increased. The foundation established on this foundation is due to the low shear strength of the lower soft clay and low permeability coefficient (K=10~(-7)~ 10 ~ (-9) cm / sec), the viscosity coefficient is very low (η = 10 ~ (-10) ~ 10 ~ (13) poise), high water content, consolidation of mechanical properties after a great change,