考虑初始孔隙比影响的水-土特征曲线计算模型  

A soil-water characteristic curve model for soils with considering effect of initial void ratio

作　　者：张文振[1] 李海潮[2] 雷华阳[1] 刘汉磊 ZHANG Wenzhen;LI Haichao;LEI Huayang;LIU Hanlei(Department of Civil Engineering,Tianjin University,Tianjin 300072,China;School of Civil Engineering,Central South University,Changsha 410083,China;School of Airport Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]天津大学土木工程系,天津300072 [2]中南大学土木工程学院,湖南长沙410083 [3]中国民航大学机场学院,天津300300

出　　处：《中南大学学报（自然科学版）》2021年第7期2394-2401,共8页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划项目(2017YFC0805402);土木工程防灾国家重点实验室开放基金项目(SLDRCE17-01);国家自然科学基金(52078334)。

摘　　要：在FREDLUND&XING模型基础上提出一种水-土特征曲线计算模型,以统一描述初始孔隙比和基质吸力对土的有效饱和度的影响。本文所提模型有较好的连续性和收敛性,适用于不同类型土体的水力特征的描述,其包含的材料参数可以采用最小二乘法由试验结果进行标定。研究结果表明:本模型能够准确地描述非饱和土的水-土特征曲线,并且可反映初始孔隙比的影响。在相同的基质吸力条件下,土的有效饱和度会随初始孔隙比增大而减小,其变化速率则会随基质吸力增大而减小。In order to describe the effects of initial porosity ratio and matric suction on soil effective saturation,a water-soil characteristic curve calculation model was proposed based on FREDLUND&XING model.The proposed model had good continuity and convergence,and it was suitable for the description of hydraulic characteristics of different types of soils.The material parameters contained in the model could be calibrated by the least square method from the test results.The results show that this model can accurately describe the watersoil characteristic curve of unsaturated soil and reflect the influence of initial porosity ratio.For the same matric suction,the effective saturation of soil decreases with the increase of the initial porosity ratio,while the change rate decreases with the increase of matric suction.

关 键 词：初始孔隙比 水-土特征曲线 数学模型 

分 类 号：TU411.4[建筑科学—岩土工程]