非饱和土的广义朗肯土压力

本文从 4条基本假设出发 ,建立了非饱和土的广义朗肯土压力公式 ,采用理想试验对该公式进行了验证 ,在北京地铁13号线的东直门车站基坑工程中理论分析结果和实测值非常接近 ,证明了该理论的有效性。土的广义朗肯土压力公式建立了土的试验指标与原位指标的关系 ,从理论上给出了用土的试验指标得到原位主动 (被动 )土压力的方法。对于非饱和土 ,采用简单易得的直剪试验指标应用广义朗肯土压力公式就可以得到相当精确的结果 ,弥补了扩展朗肯土压力理论的不足。而且广义朗肯土压力公式能够合理利用已有的工程经验和工程数据 ,为非饱和土力学的工程实用化提供了一条新的思路。

GENERIC RANKINE THEORY FOR UNSATURATED SOILS

Based on 4 basic hypotheses, a generic Rankine theory is established and verified by idealized experiments. Its application in the foundation pit project in the Dongzhimen Station of the Beijing subway line No.13 also proves its effectiveness by predicting earth pressure which is very close to results obtained from field measurements. The generic Rankine theory establishes the relationship of the soil experimental indexes with its in situ ones, which allows the estimate of in situ active or passive earth pressure with experimental indexes. For the unsaturated soil, this method provides a very accurate estimate of earth pressure from the direct shear experimental indexes, which overcomes the shortage of the extended Rankine theory. The formula can appropriately utilize existing engineering experience and data, which is a new way to application of the soils mechanics for unsaturated soils in engineering.