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对于六层以下的房屋或荷载相当的构筑物,当遇到浅层软弱土地基如淤泥、淤泥质土时,可采用换土。换填材料可用中(粗)砂、级配砂石、碎(卵)石、灰土(3∶7或2∶8)等。由于换填材料透水性好,能加速软土中的水分排出,从而加速软土固结,且有效地防止冻胀作用。各种材料的垫层均可近似地按砂垫层的计算方法进行设计计算.砂垫层设计,主要是确定断面的合理厚度和宽度.要有足够的厚
For buildings under six floors or structures with similar load, the replacement of soil can be used when encountering shallow soft soil foundation such as silt and muddy soil. Filling materials available (coarse) sand, graded gravel, broken egg (egg), lime (3: 7 or 2: 8) and so on. Because the filling material has good water permeability, it can accelerate the water excretion in the soft soil so as to accelerate the consolidation of the soft soil and effectively prevent the frost heaving. The cushion of all kinds of materials can be calculated and calculated according to the method of calculation of the sand cushion. The design of the sand cushion is mainly to determine the reasonable thickness and width of the section.