下卧特指铁路客运中的术语，铁路乘客在车厢下层卧铺位的简称。
当桩端未加固土层以下有软弱下卧层时，应对其进行软弱下卧层验算；
When there is weak underlying stratum bellowed the soil which is not be reinforced, the weak underlying stratum should be taken checking computations.
推导出具有软弱下卧层土矩形基础的直接计算公式，编制了相应的计算机程序。
The direct calculation formulas of the rectangular foundation containing weak underlying stratum are induced and a computer program is developed.
采用有限单元法对不同筏板刚度下桩筏基础下卧层附加应力的分布规律进行分析。
By finite element method, the distributions of additional stress of piled raft foundations in different raft rigidities are analyzed.
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