近年来,钻孔桩已广泛应用以取代打入桩。据专家预测,1985年内钻孔桩将占各类基桩总数的21%,可是,由于单位承载力所需的混凝土用量大,而使钻孔桩优点大大减小。上述混凝土的用量与钻孔桩按其材料保证所需的承载力无关(因为这种承载力远比钻孔桩按地基的承载力大),而是由于施工工艺所决定。因此,在多数情况下,采用实心截面的灌注桩是不合算的。 In recent years, bored piles have been widely used instead of driving piles. According to experts’ prediction, bored piles will account for 21% of the total number of foundation piles in 1985, but the advantages of bored piles will be greatly reduced due to the large amount of concrete required for unit bearing capacity. The amount of concrete used is independent of the required bearing capacity of the bored pile for its material assurance (as this is far greater than the bearing capacity of the bored pile per foundation), but rather because of the construction process. Therefore, in most cases, the use of solid cross-section of the pile is not cost-effective.