The influence of moisture content variation on the index of the shear strength in sandy soil foundation is researched in the paper to provide some advices for the promotion of carrying out the water source heat pump. Through direct shear test with different water content and natural basement in sandy soil foundation simulated in laboratory test,the change laws of bearing capacity,total effective stress,pore water pressure and settlement in sandy soil foundation are analyzed during the underground water level changes. The friction angle reduces with the rising of the moisture content. Decrease amplitude is larger when moisture content is less than 5% ,however,it becomes smaller otherwise. When the sand is saturated,its friction angle is nearly 19% smaller than it is when the sand is dry. The numerical analysis results completely satisfy the accuracy requirement of indoor simulation tests. The residual of saturated sand may be perfected with the fitting formulae method. These may provide reference for the engineering application.%目的 研究砂土地基中含水量变化对抗剪强度指标的影响,为开展水源热泵推广工作提供指导建议.方法 通过进行不同含水量情况下的直剪试验,再通过室内试验模拟砂土地基上的天然基础,分析在地下水位发生变化时,砂土地基的承载力、土中总应力,有效应力、孔隙水压力及沉降等的变化规律.结果 粗砂随着含水率的增加摩擦角有减小的趋势,含水率＜5％时减少幅度较大,随后降幅变小.饱和时的摩擦角比干砂降低了近19％.结论 数值分析的结果完全满足室内模拟试验的精度要求,对于饱和砂土出现的误差,可采取拟合公式的方法完善,可为工程应用提供借鉴.
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