土体密实状态对土-水特征曲线影响规律研究  

Research on influence of soil density on soil-water characteristic curve

作　　者：张雪东[1] 赵成刚[1] 蔡国庆[1] 刘艳[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《岩土力学》2010年第5期1463-1468,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.50778013);北京自然科学基金项目(No.8082020)

摘　　要：土-水特征曲线(SWCC)是非饱和土力学中的一个重要概念。在众多影响土-水特征曲线的因素中,土体密实状态(文中用孔隙比表示)的影响最为常见并且十分重要。以毛细管模型和Childs(1950年)提出的统计学假定为基础,分析了孔隙比发生改变时土-水特征曲线上的点的变化规律,并以此为基础提出了一种以两条已知初始孔隙比的土-水特征曲线为基准,预测具有任意初始孔隙比土体的土-水特征曲线的计算方法。通过与试验结果对比,验证了该方法的合理性。由于测量土-水特征曲线比较费时,利用该方法预测具有不同孔隙比的土-水特征曲线,可减少试验测量的工作量,从而使土-水特征曲线在实际应用中更加方便、实用。Soil water characteristic curve（SWCC） is an important concept in unsaturated soil mechanics;and current research work requires SWCC to reflect more contents and factors.Among the factors influencing the SWCC,the influence from soil density is common and important.Research on how to mathematically describe the influence of soil density on SWCC is carried out.Based on the capillary model and Childs’（1950） statistical assumption,the motion law of the point on a SWCC in the situation of density variation is found;and an empirical method for estimating the SWCC corresponding to different initial soil densities based on two SWCCs with determined densities is proposed.Comparing the predicted results with experimental findings,a good precision is found.As the determination of SWCC from experiments is time consuming,predicting SWCC with different densities through this method can greatly reduce the workload of experiments,which can make the usage of SWCC in practice more convenient;besides,more influencing factors can also be considered.

关 键 词：土-水特征曲线 孔隙比 统计学假定 毛细管模型 

分 类 号：TU473[建筑科学—结构工程]