水汽补给下砂土水分迁移规律及冻胀特性研究  

On water migration and frost heaving characteristics of sand under water vapor recharge

作　　者：雷华阳[1,2,3] 张文振 冯双喜[1,3] 霍海峰[4] LEI Hua-yang;ZHANG Wen-zhen;FENG Shuang-xi;HUO Hai-feng(Department of Civil Engineering,Tianjin University,Tianjin 300354,China;Key Laboratory of Coast Civil Structure Safety of Education Ministry,Tianjin University,Tianjin 300354,China;Key Laboratory of Comprehensive Simulation of Engineering Earthquake and Urban-Rural Seismic Resilience,China Earthquake Administration,Tianjin 300350,China;School of Airport,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]天津大学土木工程系,天津300354 [2]天津大学滨海土木工程结构与安全教育部重点实验室,天津300354 [3]中国地震局地震工程综合模拟与城乡抗震韧性重点实验室,天津300350 [4]中国民航大学机场学院,天津300300

出　　处：《岩土力学》2022年第1期1-14,共14页Rock and Soil Mechanics

基　　金：国家重点研发计划项目(No.2017YFC0805402);土木工程防灾国家重点实验室开放基金项目(No.SLDRCE17-01);国家自然科学基金(No.52078334)。

摘　　要：利用自主研发的水分迁移和冻胀试验装备,研究了不同初始含水率、冷端温度、干密度对砂土水分迁移规律的影响,分析了三因素作用下砂土水平冻胀力和冻胀量的变化规律,确定了冻结锋面位置。研究表明:初始含水率和冷端温度对砂土的水分迁移和冻胀效果影响明显;初始含水率从0%增加至10%,试样含水率峰值增大了5.00倍,水平冻胀力和冻胀量不断增大,冻结锋面位置上移至2.5 cm高度处。冷端温度从-5℃降低至-15℃,试样含水率峰值增大了4.38倍,水平冻胀力和冻胀量不断增大,冻结锋面位置上移至2.6 cm高度处。干密度对试样水分迁移和冻胀特性影响相对不明显,整体呈现出在较小干密度下,试样含水率、水平冻胀力和冻胀量增幅稍大的趋势,冻结锋面集中在2.2~2.5 cm高度处。针对不同影响因素提出了水平冻胀力和冻胀量预测公式,为认识水汽补给下砂土水分迁移规律及合理预防冻胀提供参考。The influence of different initial water contents,cold end temperatures and dry densities on sand water migration was studied using the self-developed water migration and frost heaving testing equipment.The influence of these three factors on frost heaving force and frost heaving capacity and the position of ice peak were determined.The results show that the initial water content and cold end temperature have obvious influence on the soil water migration and frost heaving effect.The water content increases from 0%to 10%,the peak water content increases by 5.00 times.The lateral frost heaving force and the frost heaving amount are increasing,and the ice front position moves up to 2.5 cm in height.The cold end temperature reduces from-5℃to-15℃,the peak water content increases by 4.38 times.The lateral frost heaving force and the frost heaving amount are increasing,and the position of the ice peak moves up to 2.6 cm in height.Dry density has relatively insignificant influence on water migration and freezing characteristics of specimens.The results show an overall trend of slightly larger increases in specimen water content,lateral frost heaving force and frost heaving amount at smaller dry densities,and the position of the ice peak is concentrated in 2.2-2.5 cm in height.The prediction formulas of frost heaving force and frost heaving amount are put forward for different influencing factors,which can provide a reference for understanding the water migration law in sand under water vapor recharge and reasonably preventing frost heaving.

关 键 词：砂土 水分迁移 冻胀特性 水汽补给 

分 类 号：TU443[建筑科学—岩土工程]