含砂黄土土水特征曲线试验研究与参数识别  

Experimental study and parameter identification of soil water characteristic curve of sandy loess

作　　者：陶睿 李典庆[1,2] 曹子君[1,2] 傅晓英[3] TAO Rui;LI Dianqing;CAO Zijun;FU Xiaoying(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Institute of Engineering Risk and Disaster Prevention,Wuhan University,Wuhan 430072,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学工程风险与防灾研究所,湖北武汉430072 [3]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《武汉大学学报（工学版）》2021年第7期579-587,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51579190,51679174);四川大学水力学与山区河流开发保护国家重点实验室开放合作基金项目(编号:SKHL1619);深圳市(重点)技术攻关项目(编号:20170324)。

摘　　要：崩积黄土-砂土混合物在黄土滑坡中普遍存在,影响非饱和黄土边坡的稳定性。含砂黄土物理力学性质复杂,相关研究资料十分有限,尤其对其持水特性认识严重不足。土水特征曲线(soil-water characteristic curve,SWCC)作为非饱和土力学的关键函数,描述了土体含水率(或饱和度)与基质吸力之间的关系,SWCC在非饱和土抗剪强度、变形及渗透特性研究等方面发挥着重要的作用。基于土砂混合物SWCC压力板仪试验,结合贝叶斯理论进行SWCC模型参数反演,确定不同掺砂比条件下SWCC的模型参数,研究了砂组分对于黄土土水特征曲线形态的影响,发现掺砂比对SWCC模型参数的影响显著,揭示了掺砂比对SWCC曲线形态的影响规律。Colluvial loess-sand mixture is commonly found in loess landslide and affects the stability of unsaturated loess slope. The physical and mechanical properties of sandy loess are very complicated, and the relevant research data are very limited, especially the understanding of its water-retention characteristics is seriously insufficient.Soil-water characteristic curve(SWCC) is a key function of unsaturated soil mechanics,and it describes the relation between soil water content(or degree of saturation) and matrix suction.SWCC plays a significant role in estimating shearing strength,deformation and permeability characteristics of unsaturated soils.On the basis of series of SWCC tests of loess-sand mixture using pressure plate test,Bayesian theory is applied to the SWCC model parameters inversion with different sand contents.The effects of sand composition on the SWCC shape of loess-sand mixture are analyzed. It is found that the sand ratio of loess-sand mixture has significant impacts on SWCC model parameters, and the influence rule of sand mixing ratio on SWCC shape with respect to the sand ratio is also demonstrated.

关 键 词：含砂黄土 土水特征曲线 压力板仪 贝叶斯方法 参数识别 

分 类 号：X43[环境科学与工程—灾害防治]