一、概况海河沿岸,尤其是入海口附近,表层土多为粘土、亚粘土,或淤泥质粘土、亚粘土,且夹有不同厚度的薄砂层。从它们的主要物理、力学性质指标分析,都属于软弱粘性土(以下简称软粘土)。如天津塘沽一带-13.0m高程(地面高程一般在+2.0m至+3.0m之间)以上的粘土和亚粘土,含水量ω=22％～60％,干容重r_d=1.05g/cm~3～1.2g/cm~3,孔隙比e=1.0～1.4,固结快剪强度指标φ=12°～14°,c=0.01kg/cm~2～ I. Overview At the coast of the Haihe River, especially near the sea inlet, the topsoil is mostly clay, sub-clay, or muddy clay, sub-clay, with thin sand layers of different thickness. From the analysis of their main physical and mechanical properties, they belong to weak clay (hereinafter referred to as soft clay). For example, clay and sub-clay at an elevation of -13.0m in Tianjin Tanggu (above average ground elevation between +2.0m and +3.0m), water content ω = 22% - 60%, dry bulk density r_d = 1.05g/cm~3 ~1.2g/cm~3, porosity ratio e=1.0 to 1.4, consolidation fast shear strength index φ=12°~14°, c=0.01kg/cm~2～