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在软弱的地基上进行基础施工时,为达到设计承载力的要求,通常采用换填法,即将天然软弱土层挖去或部分挖去,分层回填强度较高、压缩性较低且无腐蚀性的砂石、素土、灰土、工业废料等材料,压实后作为地基的持力层, 从而提高基层强度.就换填材料的不同而言,砂石垫层实际上是换填法的其中一种,是现实施工中最常用换填方法,应用范围广泛,尤其在住宅楼施工中的基础地基换填及道路路基换填,它具有施工简易、工期短、造价低等优点.
When carrying out the foundation construction on weak foundations, in order to meet the requirements for designing the bearing capacity, the replacement method is usually adopted, that is, the natural soft soil layer is excavated or partially excavated, the layered backfilling strength is high, the compressibility is low, and there is no corrosion. Sand, earth, earth, industrial waste and other materials, after compaction as the bearing layer of the foundation, so as to improve the strength of the base layer. In terms of different filling materials, sand cushion is actually a replacement method One of them is the most commonly used replacement method in practical construction. It has a wide range of applications, especially for the replacement of foundations and roadbeds in the construction of residential buildings. It has the advantages of simple construction, short construction period, and low cost.