当地基承载力不能满足设计要求时,要对地基进行处理。将原土挖出,换填砂石是地基处理的方法之一。近年来,我们在砂石地基施工中,逐渐摸索出振捣法、务实法和碾压法等有效的施工经验,根治了地基密实度不足的质量通病。一、材料1.采用天然砂卵石或人工级配砂(碎)石,粒径2～5mm的颗粒占总重的45%以上,5～50mm 的占50%以下。小于0,074mm的不超过5%,不符合要求 When the bearing capacity of the ground cannot meet the design requirements, the foundation should be handled. Digging out the original soil and replacing sand and gravel are one of the methods for foundation treatment. In recent years, during the construction of gravel foundations, we have gradually explored effective construction experience such as vibrating method, pragmatic method, and roller compaction method, and have solved the problem of insufficient quality of foundations. 1. Materials 1. Natural sand pebbles or artificially graded sand (crushed) stones are used. Particles with a particle size of 2 to 5 mm account for more than 45% of the total weight and 5–50 mm for less than 50%. Less than 0,074mm does not exceed 5%, does not meet the requirements