中文摘要：

采用统计分析气候资料和现场测试含水率的办法，对合肥地区大气影响深度进行了研究，其结果表明，按气象资料统计分析法计算的大气影响深度比实际值小。在此基础上，建议按膨胀力与零膨胀率的相关性来确定膨胀土路基处置深度。通过合肥地区18个代表性土样的膨胀力试验，给出了膨胀力与零膨胀率的相关曲线，为膨胀土路基处置深度的确定提供了可靠的依据。最后，给出了合肥地区膨胀上路基不同结构部能处置深度的建议。

英文摘要：

The depth of soil layer which influenced by climate in Hefei is studied by way of climate environmental data and field experiment of water content. It can be found that the calculated depth of the layer according to climate environmental data is smaller than the real value. On this foundation, the determination method of treatment depth for subgrade paved with expansive soil is proposed based on the relationship of swelling pressure and unloaded expansibility. The correlative curve of the expansive pressure and the unloaded expansibility is established by means of swelling pressure test of eighteen representative soils selected from Hefei. It provides reliable references for determining the treatment depth of subgrade. Finally, some suggestions of treatment depth for the different structure positions of subgrade are given.