摘要
针对某重塑黏土,通过常规固结仪,研究了恒压下初始孔隙比、应力及初始饱和度对湿化变形的影响。试验结果显示,应力和初始孔隙比e对湿化变形影响明显,低应力下,变形随e的提高逐渐由膨胀变为压缩;高应力下,试样均发生压缩,压缩量随e的增大而增大;定量分析了湿化变形与应力和e之间的关系。试样湿化稳定时间t0受应力和初始孔隙比e影响明显,t0随应力的增加而增大;低应力下,t0随e的增加而增大,高应力下,t0随e的增加先增大后减小。初始饱和度Sr对湿化变形也有较大影响,低压应力下,试样膨胀量随着Sr的增加先减小后增大,可能存在"最优初始饱和度",使得变形量最小;高压应力下,试样压缩量随Sr的增加而减小,二者可近似用直线拟合。
This study investigated the influences of initial void ratio, stress, and initial water saturation on the wetting deforma- tion of remolded cohesive soil under constant pressure using the conventional consolidation apparatus. The experimental results showed that the stress and initial void ratio e had significant impact on the wetting deformation. Under low stress, the deformation changed from expansion to shrinkage with the increase of e; while under high stress, all the samples were compressed and the amount of compression would increase with the increase of e. The relationships among wetting deformation, stress, and e were analyzed quantitively. The wetting stability time to was affected obviously by the stress and e. The t0 would increase with the increase of stress. Under low stress,t0 would increase with the increase of e; under high stress, to would increase first and then decrease with the increase of e. The initial water saturation Sr also had great influences on the wetting deformation. Under low stress, the swelling capacity would decrease first and then increase with the increase of Sr ;the ＂optimum initial water satu ration＂ may exist, which can lead to the smallest deformation. Under high stress, the amount of compression would decrease with the increase of St, and their relationship was approximately linear.
出处
《南水北调与水利科技》
CSCD
北大核心
2017年第6期144-150,共7页
South-to-North Water Transfers and Water Science & Technology
基金
山东省重点研发计划(2017GSF16104)
中央高校基本科研业务费专项资助项目(2017B651X14)
江苏省研究生科研与实践创新计划资助项目(KYCX17_0475)
山东省科技发展计划项目(2012GNC11203)~~
关键词
非饱和土
孔隙比
饱和度
湿化变形
unsaturated soil
void ratio
water saturation
wetting deformation
