膨胀土地基是一种经常遇到的特殊地基,它的特点是吸水就膨胀、失水就收缩,压缩性低,但因一般强度较高,易被误认为是建筑性能较好的地基土。由于过去对其特性缺乏认识,致使数百万平方米建筑物产生不同程度开裂破坏,给国民经济造成严重损失。近年的科学试验和工程实践,表明膨胀土地基并不是不可利用的。下面就简要地谈一下膨胀土地基设计中的一些问题。 The expansive soil foundation is a special foundation that is often encountered. It is characterized by water expansion, water loss, shrinkage, and low compressibility. However, because of its high general strength, it is easily mistaken for foundation soils with good building performance. Due to the lack of understanding of its characteristics in the past, millions of square meters of buildings were cracked to various degrees, causing serious losses to the national economy. Recent scientific experiments and engineering practices have shown that expansive soils are not unusable. Let’s briefly talk about some issues in the design of expansive soils.