摘要
为探讨非饱和路堤填土湿化变形规律,应用非饱和土三轴仪,对干密度为1.7和1.8 g/cm3的重塑黄土进行24组剪切试验,控制净室压力为50,100和200 kPa,控制吸力为0,50,100和200 kPa。采用2种简化的模型和双线法分析湿化变形,给出应用线性简化模型和双曲线模型计算湿化变形的公式,并确定公式中的参数取值。通过分析2种模型计算的湿化变形发现,干密度对湿化变形影响很大,因此提高路基压实度可以有效地控制湿化变形。
24 groups of shear tests on remolded loess are conducted by using triaxial apparatus for unsaturated soils to study the wetting deformation laws of unsaturated embankment fill.The dry densities of specimens are 1.7 and 1.8 g/cm3,respectively;the cell pressures are chosen as 50,100 and 200 kPa;and the control suctions are chosen as 0,50,100 and 200 kPa.Based on the above,two simplified models and double-line method are used in the analysis of wetting deformation;and formulae for calculating the wetting deformation using the two models mentioned above and values of relevant parameters are proposed.Through the analysis,it is shown that the wetting deformation are greatly influenced by the dry density;and the wetting deformation could be effectively controlled through the enhancement of compaction of the roadbed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第8期1698-1704,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
非饱和填土
控制吸力和净围压的三轴剪切试验
湿化变形
双线法
简化模型
soil mechanics
unsaturated fill
triaxial shear tests with controlled suction and cell pressure
wetting deformation
double-line method
simplified models
