摘要
为了研究不同注水方式对膨胀土膨胀量的影响,取某高速铁路地基膨胀泥岩,进行不同数量开孔和不开孔方式注水的重塑膨胀土浸水膨胀变形试验,并分析得到了开孔造成的土体损失体积率与膨胀量损失量之间的关系。试验结果表明:开孔注水与不开孔注水的膨胀时程曲线、膨胀量与含水率关系曲线有很大不同;各注水方式下,膨胀时程曲线和膨胀量与含水率关系曲线变化规律基本一致。开孔注水方式下,膨胀时程曲线、膨胀量与含水率关系曲线可分为三个阶段:初始快速膨胀阶段、减速膨胀及逐渐稳定阶段、突然增长阶段。不开孔注水方式下,膨胀时程曲线、膨胀量与含水率关系曲线可分为四个阶段:初始缓慢膨胀阶段、快速膨胀阶段、减速膨胀及逐渐稳定阶段、突然增长阶段。土体损失体积率与膨胀量损失量之间呈良好的线性关系,其关系式为Δδ=0.617ΔV+0.02。
In order to study the influences from different water injection modes on the swelling amount of expansive soil,the moistening-swelling deformation experiments on the remolded expansive soil samples under the modes of both the water injection with different numbers of holes and the water injection without hole are carried out by taking the expansive mudstone from the foundation of a high-speed railway,from which the relationship between the volume loss rate and the amount of expansion loss of the soil mass caused by the hole-opening is analyzed as well. The experiment result shows that the relationship curve among the time-travel expansive curve,swelling amount and water content under the mode of water injection with hole is quite different from that under the mode of water injection without hole,while the changing laws of the relationship curves among the time-travel expansive curve,swelling amount and water content under both the modes of water injection are basically coincided. Under the mode of water injection with hole,the relationship curve among the time-travel expansive curve,swelling amount and water content can be divided into three phases,i. e. initial quick swelling phase,decelerated swelling and gradually stable phase and sudden swelling phase. Under the mode of water injection without hole,the relationship curve among the time-travel expansive curve,swelling amount and water content can be divided into four phases,i. e. initial slow swelling phase,quick swelling phase,decelerated swelling and gradually stable phase and sudden increasing phase. Meanwhile,a better linear relationship presents between both the volume loss rate and the amount of expansion loss of the soil mass,for which the relationalexpression is Δδ =0. 617ΔV ＋ 0. 02.
作者
李进前
王起才
张戎令
王天双
张唐瑜
谢智刚
LI Jinqian;WANG Qicai;ZHANG Rongling;WANG Tianshuang;ZHANG Tangyu;XIE Zhigang(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China;National and Provincial Joint Engineering Laboratory of Road and Bridge Disaster Prevention and Control,Lanzhou 730070,Gansu,China;Key Laboratory of Road ＆ Bridges and Underground Engineering of Gansu Province,Lanzhou 730070,Gansu,China)
出处
《水利水电技术》
CSCD
北大核心
2018年第6期179-184,共6页
Water Resources and Hydropower Engineering
基金
国家自然科学基金项目(51768033)
教育部长江学者和创新团队滚动支持发展计划(IRT_15R29)
中国铁路总公司科技研究计划(Z2015-G001)
青年人才托举工程(2015QNRC001)
飞天学者特聘计划
关键词
膨胀土
注水方式
膨胀量
含水率
expansive soil
water injection mode
swelling amount
water content
