摘要
以张家口延崇高速公路沿线路基土为研究对象,通过大量非饱和土三轴试验,研究吸力及冻融循环次数对其力学特性的影响。结果表明:高吸力范围内,土样的破坏形式表现为应变软化型破坏;吸力越大抗剪强度越大,近似对数型增长;随冻融循环次数的增加抗剪强度表现为:先增大后减小最终趋于稳定。根据研究结果提出考虑吸力和冻融循环次数影响的非饱和土的切线变形模量的表达式,可用于预估不同吸力、不同冻融循环次数下非饱和土应力-应变曲线的峰前部分,为寒区非饱和土边坡高次冻融循环和宽广吸力条件下的稳定性提供理论判据。
The effect of suction and the number of freeze-thaw cycles on the mechanical properties of unsaturated soils was investigated by means of a large number of triaxial tests on the roadbed soils along the Yan Chong Expressway in Zhangjiakou.The results show that the damage of the soil samples in the high suction range is in the form of strain softening damage;the higher the suction the higher the shear strength,which is approximately logarithmic in growth;with the increase of the number of freeze-thaw cycles the shear strength shows that it first increases,then decreases and finally stabilises.Based on the results of the study,an expression for the tangential deformation modulus of unsaturated soils considering the effects of suction and the number of freeze-thaw cycles is proposed,which can be used to predict the peak front part of the stress-strain curve of unsaturated soils under different suction and different number of freeze-thaw cycles,providing theoretical criteria for the stability of unsaturated soil slopes in cold regions under high freeze-thaw cycles and wide suction conditions.
作者
胡淑旗
訾亚丹
HU Shu-qi;ZI Ya-dan(Hebei University of Architecture,Zhangjiakou 075000,China)
出处
《河北建筑工程学院学报》
CAS
2022年第3期46-51,共6页
Journal of Hebei Institute of Architecture and Civil Engineering
基金
河北建筑工程学院创新基金项目(XY202208)
关键词
路基边坡
三轴试验
吸力
冻融循环
邓肯-张模型参数
road base slopes
triaxial test
suction
freeze-thaw cycles
Duncan-Chang model parameters
