This paper introduced the swelling shrinkage of expansive soil and its hazards to building, combining with foundation investigation and evaluation of expansive soil, elaborated the conventional processing method of expansive soil, and through the example discussed the treatment measures of expansive soil, to ensure the building safety,%介绍了膨胀土的膨胀收缩成因及对建筑的危害，结合膨胀土的地基勘察评价，阐述了膨胀土的常规处理方法，并通过实例论述了膨胀土的处理措施，以确保建筑物的使用安全。
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