摘要
在寒区桩基工程中,冻土-混凝土界面强度对于桩基础的受力状态有着重要的影响。在开敞系统条件下进行了冻土-混凝土界面区的抗拉强度正交试验,利用极差方差分析法,厘清了界面粗糙度、土样含水率、试验温度及干密度4种试验因素对界面冻结抗拉强度影响的主次顺序。分析试验结果表明,土样含水率的增大、试验温度的降低及接触面粗糙度的提升均可使界面冻结抗拉强度不断提高;存在临界土样含水率,当含水率位于临界含水率两侧时,接触面粗糙度因水分迁移所形成冰膜改变的程度不同,导致接触面粗糙度的增加对界面冻结抗拉强度增幅的影响程度具有不同的规律。
In pile foundation engineering in cold regions,the strength of frozen soil-concrete interface has an important influence on the stress state of pile foundation.The tensile strength orthogonal test of the frozen soil-concrete interface zone was carried out under the condition of open system.The range analysis of variance method was used to clarify the primary and secondary order of the influence of four test factors,namely interface roughness,soil moisture content,test temperature and dry density,on the frozen tensile strength of the interface.The test results show that the increase of soil moisture content,the decrease of test temperature and the increase of contact surface roughness can continuously improve the frozen tensile strength of the interface.There is a critical moisture content in the soil sample.When the moisture content is located on both sides of the critical moisture content,the roughness of the contact surface changes to different degrees due to the ice film formed by the water migration,which leads to different laws in the impact of the increase in contact surface roughness on the increase in frozen tensile strength of the interface.
作者
孙铁成
杨逸
杨茜
董创奇
SUN Tiecheng;YANG Yi;YANG Qian;DONG Chuangqi(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structure,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of the Ministry of Education for Road and Railway Engineering Safety Assurance,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Construction Science and Industry Co.Ltd.,Shenzhen 518000,China)
出处
《石家庄铁道大学学报（自然科学版）》
2024年第2期92-98,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金(52178340)。
关键词
冻土-混凝土界面
冻结抗拉强度
开敞系统
水分迁移
正交试验
frozen soil-concrete interface
frozen tensile strength
open system
moisture migration
orthogonal test
作者简介
孙铁成(1974-),男,教授,研究方向为冻土区岩土工程。E-mail:sjz_sti@stdu.edu.cn。
