高印立
    （中国建筑科学研究院地基所  北京 100013）

[提要]  常规土压力计算均建立在半无限土体假定的基础之上，而对于有限土体一般仍沿用常规的朗肯、库仑土压力理论，这与实际情况有一定的差异。基于土的塑性上限理论，给出一种有限土体土压力的计算公式，并与朗肯土压力计算结果进行了对比分析。
[关键词]  基坑开挖  有限土压力  朗肯土压力  土的塑性上限理论

The calculation of normal earth pressure is based on the semi-infinite assumption. But Rankine's and Coulomb's theories are still followed for the calculation of finite earth pressure, which is different from the practice. An earth pressure calculating formula is presented based on the soil plasticity upper-bound theory. And the calculated results are analyzed comparing with those of Rankine's earth pressure.
Keywords:  foundation excavation; finite earth pressure; Rankine's earth pressure; soil plasticity upper-bound theory