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1 概述 1994年,诸城市在九龙河治理工程中,沿河修建的挡土墙及一座大型空心板桥都坐落在软粘土地基上,这种土的天然含水量在45％～70％,甚至更高;孔隙比为1.5～2.0以上,天然强度低,10KPa左右;N_(63.5)为1～2击,压缩性强,透水性低。由于受气候影响,含水量减少,经雨水浇洒和人为活动,收缩固结后,其N_(63.5)也只有3击左右。在这类地区所建挡土墙墙后的回填土,用当地自然风干的软粘土回填,其含水量仍偏高,C、φ填甚低,用人工或机械压实
1 Overview In 1994, all the retaining walls along the river and a large hollow slab bridge in the Zhuji River harnessing project in Zhucheng were located on soft clay foundations. The natural water content of this kind of soil was between 45% and 70% Higher; porosity ratio of 1.5 to 2.0 or more, low natural strength, about 10KPa; N_ (63.5) for 1 to 2 shots, strong compressibility, low permeability. Due to the impact of climate, water content decreased, after rainwater and man-made activities, shrink consolidation, its N_ (63.5) is only about 3 shots. The backfill behind the retaining wall built in this kind of area is backfilled with locally dried soft clay and its water content is still high. C and φ are very low and are manually or mechanically compacted