季冻区水平和立体加筋土体防冻胀融沉效果研究  被引量:1

Effects of horizontal and three-dimensional reinforcement on frost-heaving and thawing-settlement in seasonally frozen soils

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作  者:孙若晗 刘润[2] 王晓磊[3] 张欢[4] SUN Ruohan;LIU Run;WANG Xiaolei;ZHANG Huan(Institute of Marine Energy and Intelligent Construction,Tianjin University of Technology,Tianjin 300384,China;State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation,Tianjin University,Tianjin 300350,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;Sichuan Chuanjiao Road&Bridge Co.,Ltd.,Guanghan 618300,China)

机构地区:[1]天津理工大学海洋能源与智能建设研究院,天津300384 [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

出  处:《岩土工程学报》2024年第S01期16-21,共6页Chinese Journal of Geotechnical Engineering

摘  要:冻胀融沉是季节性冻土区建筑物破坏的主要原因,实际应用表明,土工合成材料加筋路基具有良好的抗冻融循环损伤能力,然而不同加筋形式的有益影响尚未被量化。针对四川阿坝地区典型季节性冻土,开展了水平及立体加筋土冻融循环试验及平板载荷试验,研究了冻融循环对加筋土和未加筋土力学性能的影响,对比了水平加筋及立体加筋土的防冻胀融沉效果。研究发现:水平加筋和立体加筋均可一定程度上抑制土体的冻胀融沉,提高冻融循环后土体的承载力,抑制冻融循环的弱化作用。立体加筋加固效果优于水平加筋。经过5次冻融循环后,水平加筋使冻胀隆起和融化沉降分别减少5%,6%,立体加筋使冻胀隆起和融化沉降分别减少4%,17%;水平加筋对冻融循环土体的承载力和刚度分别提高75%,29%,立体加筋对冻融循环土体的承载力和刚度分别提高388%,40%。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 

分 类 号:TU433[建筑科学—岩土工程]

 

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