防灾减灾工程学报2025，Vol.45Issue(6)：1444-1454,11.DOI:10.13409/j.cnki.jdpme.20250430049
湿干冻融耦合循环下加高渠道不协调变形特性
Uncoordinated Deformation Characteristics of Heightened Canals under Wet-dry-freeze-thaw Coupling Cycles
摘要
Abstract
According to the characteristics of seasonal water supply and periodic temperature variations of canals in alpine regions,the external conditions of canals can be simplified as wet-dry-freeze-thaw coupling cycles by taking one year as a full cycle.A frost-heave model considering water-heat coupling and soil damage was employed to simulate the deformation process of heightened canals in alpine re-gions under wet-dry-freeze-thaw coupling cycles using the finite element method,with particular em-phasis on the uncoordinated deformation characteristics between the new and old canal slopes.The re-sults showed that uncoordinated deformation zones of the heightened canal under the wet-dry-freeze-thaw coupling cycles were concentrated near the heightening interface,mainly resulting from the unco-ordinated frost-heave and thaw-settlement deformations of the canal slope during the freezing and thawing stages.With increasing wet-dry-freeze-thaw cycles,the saturated area below the seepage point of the canal slope gradually deepened and expanded,while the saturation of the canal top soil de-creased,which intensified the uncoordinated frost heave between the canal top and slope.The uncoor-dinated deformation of the canal slope led to the formation of voids between the canal soil and lining.Based on the characteristics of these voids,the uncoordinated deformation patterns of heightened ca-nals in alpine regions can be divided into three typical types:voids in the heightening layer,voids at the interface,and slope-lining bulging accompanied by voids in the heightening layer.When analyzing the uncoordinated deformation of the heightened canal in the alpine regions,it is recommended to adopt four points—the slope crest,the heightening interface,the slope midpoint,and the seepage point—as deformation control points,on the basis of which the void configuration and maximum void deformation of the heightened canal can be assessed.关键词
湿干冻融/加高渠道/水-热耦合/不协调变形/冻胀Key words
wet-dry-freeze-thaw/heightened canals/water-heat coupling/uncoordinated deformation/frost heave分类
建筑与水利引用本文复制引用
GUO Wanli,SHEN Xin,ZHAO Yuchen,HUANG Han..湿干冻融耦合循环下加高渠道不协调变形特性[J].防灾减灾工程学报,2025,45(6):1444-1454,11.基金项目
国家自然科学基金(51909170)资助 （51909170）
