地下水位下降饱和—非饱和土沉降简化计算

Simplified Calculation of Saturated—unsaturated Settlement during Water Level Fall

地下水位下降导致土体有效应力变化,发生饱和—非饱和固结沉降。基于单相流假设和Bishop有效应力原理,结合简化的直线型土水特征曲线,建立了反映地下水位下降土层饱和—非饱和沉降的数学模型。计算分析了不同水位降深饱和、非饱和区域的沉降量,结果表明,地面沉降随着地下水位降低不断增大,非饱和区土体沉降量占总沉降量的比例增加。

Saturated-unsaturated consolidation settlement occured due to effective stress change during ground water level fall. Based on the single-phase flow hypothesis and the unsaturated effective stress principle, incorporated the linear soil-water characteristic curve, a mathematical model which can consider settlement in both saturated zone and unsaturated zone was derived. Saturated-unsaturated settlement of the different water level fall was calculated, re- suits showed surface subsidence increases with the decline of water table, the proportion of settlement of unsaturated zone is amplified.