岩土工程学报2024，Vol.46Issue(z1)：16-21,6.DOI:10.11779/CJGE2024S10025
季冻区水平和立体加筋土体防冻胀融沉效果研究
Effects of horizontal and three-dimensional reinforcement on frost-heaving and thawing-settlement in seasonally frozen soils
孙若晗 1刘润 2王晓磊 3张欢4
作者信息
- 1. 天津理工大学海洋能源与智能建设研究院,天津 300384||水利工程智能建设与运维全国重点实验室(天津大学),天津 300350
- 2. 水利工程智能建设与运维全国重点实验室(天津大学),天津 300350
- 3. 河北工程大学土木工程学院,河北 邯郸 056038
- 4. 四川川交路桥有限责任公司,四川 广汉 618300
- 折叠
摘要
Abstract
The frost heaving and thaw-induced settlement is the primary causes of structural damage in the areas with seasonally frozen soils.Practical applications have demonstrated that the roadbeds reinforced with geosynthetic materials exhibit excellent resistance to cyclic frost-thaw damage.However,the beneficial effects of various forms of reinforcement have not been quantified.To address this gap,the freeze-thaw cycle tests and plate-load tests are conducted on soil samples,horizontally or three-dimensionally reinforced,collected from a representative seasonal frozen soil site in the Aba area,Sichuan Province.The effects of freeze-thaw cycle on the mechanical properties of the reinforced soil are compared to those of unreinforced soil.Additionally,a comparative analysis of the mitigation effects of frost-heaving,thawing-settlement and bearing capacity is performed between the horizontally and three-dimensionally reinforced soils.The study reveals that the frost-heaving and thawing-settlement in the soils can be effectively mitigated by both the horizontal and three-dimensional reinforcements.Moreover,these reinforcement methods enhance the post-freeze-thaw bearing capacity of the soils and counteract the weakening effects of freeze-thaw cycles.Notably,the three-dimensional reinforcement demonstrates a superior reinforcing effect in comparison to the horizontal reinforcement.Following five freeze-thaw cycles,the horizontal reinforcement results in a 5%reduction in the frost-heave and a 6%reduction in the thaw-induced settlement,while the three-dimensional reinforcement yields a 4%reduction in the frost heave and a 17%reduction in the thaw-induced settlement.The horizontal reinforcement enhances the bearing capacity and stiffness of freeze-thaw cyclic soil by 75%and 29%,respectively.In contrast,the three-dimensional reinforcement significantly improves the bearing capacity and stiffness of the freeze-thaw cyclic soils by 388%and 40%,respectively.关键词
冻融循环/季节性冻土/冻胀融沉/水平加筋/立体加筋Key words
freeze-thaw/seasonally frozen soil/frost-heaving and thawing-settlement/horizontal reinforcement/three-dimensional reinforcement分类
土木建筑引用本文复制引用
孙若晗,刘润,王晓磊,张欢..季冻区水平和立体加筋土体防冻胀融沉效果研究[J].岩土工程学报,2024,46(z1):16-21,6.
