冻融循环下加筋砂土边坡性能模型试验研究OA
Model test study on performance of reinforced soil slope under freeze-thaw cycles
为研究冻融循环对土工格栅加筋砂土边坡性能的影响规律以及加筋对边坡变形的抑制作用,在-25 ℃和30 ℃下对建造的1.2 m高加筋和未加筋土边坡模型进行了 7次冻融循环试验,通过定性与定量分析,研究边坡内部热传导、水分迁移、边坡沉降、侧向位移在冻融循环作用下的变化规律.研究结果表明:在冻融作用下,边坡内部温度呈周期性变化,边坡受外界温度影响从自由面向内逐渐越小;在冻结时边坡内部水分存在向自由面和底部的双向迁移,在融化时以重力作用下的竖向迁移为主;边坡沉降表现为周期性的冻胀与融沉,总沉降量随冻融次数的增加而累积;边坡位移在冻融过程中呈现冻胀融缩现象,总位移随冻融次数的增加而增大;加筋阻碍了边坡内部水分竖直方向上的迁移,进而影响边坡温度场,且加筋对冻融作用引起的边坡变形具有良好的抑制效果.
To examine the impacts of freeze-thaw cycles on the performance of geogrid reinforced soil slope and the inhibition effect of reinforcement on sand slope deformation,two model tests were conducted on 1.2 m high slopes subjected to 7 freeze-thaw cycles under-25℃ and 30℃ conditions.The tests compared the performance of reinforced and unreinforced slopes,analyzing qualitative and quantitative variations in heat transfer,moisture migration,settlement,and lateral deformation of the slopes under freeze-thaw cycles.The results indicated that the slope temperature exhibited periodic changes during freeze-thaw cycles,with diminishing influence of external temperature from the free surface inward.During freezing,moisture migration within the slope occurred bidirectionally toward the free surface and base,while vertical migration predominated during thawing due to gravity.The slope settlement demonstrated periodic frost heave and thaw subsidence,with cumulative total settlement increasing with the number of freeze-thaw cycles.The slope displacement displayed freeze-expansion and thaw-induced contraction,and the total displacement increased with the number of freeze-thaw cycles.Reinforcement hindered vertical moisture migration within the slope,thereby changing the temperature field of the slope,and reinforcement effectively mitigated the deformation of the slope caused by freeze-thaw action.
徐超;韦小当;孟亚;杨阳;贾斌
同济大学地下建筑与工程系,上海 200092||同济大学岩土及地下工程教育部重点实验室,上海 200092同济大学地下建筑与工程系,上海 200092同济大学地下建筑与工程系,上海 200092同济大学地下建筑与工程系,上海 200092||同济大学岩土及地下工程教育部重点实验室,上海 200092中国电力工程顾问集团华东电力设计院有限公司,上海 200063
建筑与水利
土工合成材料砂土加筋土边坡冻融循环模型试验
geosyntheticsandreinforced soil slopefreeze-thaw cyclemodel test
《湖南大学学报（自然科学版）》 2026 (1)
1-11,11
国家自然科学基金资助项目(41772284),National Natural Science Foundation of China(41772284)国家电网有限公司特高压建设分公司科技项目(SGTYHT/23-JS-001),Scientific Research Program of State Grid Co.,Ltd.UHV Construction Branch of China(SGTYHT/23-JS-001)中国电力工程顾问集团华东电力设计院有限公司科研项目(30-K2023-G01),Scientific Research Program of the East China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group(30-K2023-G01)
评论