当建筑物基础下的持力层比较软弱，不能满足上部荷载对地基的要求时，常采用换土回填法来处理。施工时先将基础以下一定深度、宽度范围内的软土层挖去，然后回填强度较大的砂、石或灰土等，并夯至密实。换土回填按其材料分为砂地基、砂石地基、灰土地基等。
...网 关键词：软弱土地基;换土垫层法;深层密实法、粉体搅拌法; [gap=310]Keywords: weak soil foundation; In soil cushion method; Deep close-grained method, powder mixing method ..
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Connecting with the practices of treatments of the soft roadbed, this paper introduces several common treatment methods of soft roadbed, including soil replacement cushion method, tamping method, vibroflotation method and high-pressure rotary method.
结合软土地基处理工程实践经验,介绍了目前比较常用的几种处理软弱地基的方法,包括排淤或换土垫层法、重锤夯实法、振冲法和高压旋转法。
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通过工程实例，介绍了采用踏步换土垫层法并结合不同强度的填料用来调整控制地基不均匀沉降量处理地基的方法。
Based on a practical project, the author introduces a ground treatment method of step cushion replacement with different intensity substance to control differential sedimentation.
换土垫层厚度设计是换填法地基处理设计的关键。
The design of replacement underlayer thickness is crucial to the replacement method of ground treatment.
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