摘要
为了量化渠基土体中的水分在冻融过程中的迁移及其分布规律,揭示渠基土体的微观冻胀特性,选取渠基土体不同部位的原状土样,进行冻融试验,采用CT扫描技术,监测研究渠基土样冻融过程中的水分迁移及其孔隙水分布规律,进一步探究渠基土体的微观冻胀特性。结果表明:冻融过程中土样深度16~18 cm处的含水率较高,产生了水分积聚。冻结过程中,土体的微观孔隙结构发生了明显变化,同时发生了裂缝的张开和闭合。在融化阶段,由于冻结水快速融化,土体发生融沉,最大融沉量为6.78 mm。研究成果揭示了渠基土体单向冻融过程中的水分迁移规律、孔隙水的分布状态及其冻胀微观特性,为季节冻土区输水渠道的抗冻胀设计提供了理论基础。
In order to quantify the migration and distribution law of the water in the soil body of channel foundation during freeze-thawing process and reveal the microscopic frost-heaving characteristics of the channel foundation soil body, the undisturbed soil samples at different locations of channel foundation soil body are selected to make a freeze-thawing experiment, and then the water migration and its pore water distribution law during the freeze-thawing process of the soil sample from channel foundation is monitored and studied with CT scanning technique for further exploring the microscopic frost-heaving characteristics of the channel foundation soil body. The study result shows that the water content of the soil sample at the depth of 16~18 m during the freeze-thawing process is higher with water accumulation. During freezing process, the microscopic pore structure is obviously changed, while opening and closing of crack simutaneously occur as well. In thawing phase, thawing settlement of soil body occurs with the maximum settlement of 6.78 mm due to the quick thawing of frozen water. The study result reveals the water migration law, pore water distribution status and its microscopic frost-heaving characteristics during the unidirectional freeze-thawing process, and then provides theoretical basis for the anti-frost-heaving design of water conveyance channel in seasonal frozen soil region.
作者
姜海波
李琳
李志强
JIANG Haibo;LI Lin;LI Zhiqiang(College of Water and Architectural Engineering,Shihezi Univercity,Shihezi 832000,Xinjiang,China;CT&MRI room of the First Affiliated Hospital,Shihezi University,Shihezi 832000,Xinjiang,China)
出处
《水利水电技术》
北大核心
2020年第2期92-97,共6页
Water Resources and Hydropower Engineering
基金
国家重点研发计划课题(2017YFC0404304)
石河子大学青年创新人才培育计划(CXRC201804).
关键词
渠基土体
冻融
水分迁移
CT扫描技术
冻胀特性
soil body of channel foundation
freeze-thawing process
water migration
CT scanning technique
frost-heaving characteristics
作者简介
姜海波(1982—),男,教授,博士,主要从事水工结构的抗冻试验及数值模拟研究工作。E-mail:klaud_123@163.com
