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广东省中山县农机二厂的五吨锻锤基础是一个11.4×7.0×6.65米的大型基础。这个基础支承在九根长10～14米、直径为1.0米的钻孔灌注桩上(钻孔灌注桩插入岩层约0.5～1.0米)。基坑开挖时,由于基础底面标高为-6.65米、原地面标高为-0.5～-0.7米,需要挖去深6.0米的土。该处的地基条件为:表土1.7米是耕土及淤泥,下面3.1米是淤泥细砂,再下面是亚粘土;地下水位离地面仅几十厘米(见图1)。基坑施
The five-ton forging hammer base of the Agricultural Machinery Plant in Zhongshan County, Guangdong Province is a large base of 11.4×7.0×6.65 meters. The foundation is supported on nine bored piles with a length of 10 to 14 meters and a diameter of 1.0 meters (about 0.5 to 1.0 meters of drilled cast-in-place piles). When the excavation of foundation pits is carried out, the depth of the foundation is 6.0mm and the depth of the foundation is -6.55m. The original ground elevation is -0.5--0.7m. The foundation conditions for the site are: 1.7 m of topsoil is tilled soil and silt, below 3.1 m is silt fine sand, and below is sub-clay; groundwater level is only tens of centimeters from the ground (see Figure 1). Foundation pit application