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前言黄土类土重锤夯实的目的,在于消除土层上部1.5～2米范围内的大孔结构和湿陷性质,因而减少房屋和结构物的基土在意外浸水时的总湿陷量。同时,夯实后的土层在浸水时的假定湿陷值将减小,因而可以降低湿陷性等级。当基底下湿陷性土层厚度不大于3米时,按137—56要求,建筑措施仅限于表面夯实,设计天然地基时仍象一般非湿陷性土一样地进行。
Introduction The purpose of ramming the loess class soil is to eliminate the large hole structure and collapse properties within the range of 1.5 to 2 meters in the upper part of the soil layer, thereby reducing the total amount of collapse of the foundation soil of houses and structures when accidentally flooded. At the same time, the assumed collapse value of the soil layer after tamping will be reduced when immersed in water, so that the collapsibility grade can be reduced. When the thickness of the collapsible soil below the basement is not more than 3 meters, according to the requirements of 137-56, the construction measures are limited to the surface compaction, and the design of the natural foundation is still performed like a general non-collapsed soil.