南宁地区非饱和残积黏土持水性试验  

Hydraulic properties of unsaturated residual clay from Nanning

作　　者：张爱伟 张家文 于明波 牛庚[3] 颜荣涛 ZHANG Ai-wei;ZHANG Jia-wen;YU Ming-bo;NIU Geng;YAN Rong-tao(Chemical Industry Geotechnical Engineering Co,Ltd.,Nanjing 210044,China;Guilin Institute of Geological Engineering Investigation,Guilin 541002,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]化学工业岩土工程有限公司,南京210044 [2]中国中材集团建材桂林地质工程勘察院,广西桂林541002 [3]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《桂林理工大学学报》2018年第1期112-116,共5页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(11562007;51309055);广西自然科学基金创新研究团队项目(2014GXNSFBA118236)

摘　　要：采用压力板法(吸力范围0~1.5 MPa)、滤纸法(0~40 MPa)和盐溶液蒸汽平衡法(吸力范围3~368 MPa)3种方法,对南宁地区残积黏土进行土-水特性试验,获得全吸力范围内的土-水特征曲线。试验结果表明:压实试样初始干密度1.25 g/cm3的进气值为10 k Pa,当吸力大于进气值点后,土体由饱和状态进入非饱和状态;土体持水量随着吸力的增加而减小,失水后试样发生收缩变形,考虑土体体积变化后的土-水特征曲线,更能反应其真实持水性,当吸力为367 MPa时,试样含水量为0.76%,可认为当吸力增加至106k Pa后,土体持水量趋于0。The pressure plate method and vapor equilibrium technique are used to investigate the hydraulic properties of unsaturated residual clay from Nanning,and the SWCC in the full sucton range can be obtained.The test results show that the air entry value of compacted specimens with initial dry density of 1.25 g/cm 3 is about 10 kPa.When the suction is greater than the air entry value point,The soil changes from saturated to unsaturated state.The water content or saturation of soil decreases and strain shrinkage with the increase of suction.The soil water characteristic curve of volume changes can reflect the real water holding capacity.When the suction is 367 MPa,the water content of the sample is 0.76%.It is believed that when the suction increases to 10 6 kPa,the water holding capacity of the soil tends to be 0.

关 键 词：非饱和残积土 土-水特征曲线 压力板法 滤纸法 盐溶液蒸汽平衡法 南宁地区 

分 类 号：TU411.91[建筑科学—岩土工程]