摘要
输电线路嵌岩桩基础多采用钢筋混凝土材料,实际环境中的干湿循环作用对嵌岩桩基础的岩石与混凝土结构面的基本力学特性影响明显。对灰岩-混凝土接触面试样进行不同次数的干湿循环处理,开展了室内法向恒载条件下的剪切试验,获取不同法向应力水平条件下的剪切力学特性,建立了灰岩-混凝土接触面抗剪强度-干湿循环次数关系数学模型。结果表明:灰岩-混凝土试样与灰岩单一试样的剪切应力-应变曲线有明显差别;随着试样干湿循环次数的增加,接触面黏聚力呈现降低趋势,接触面的抗剪强度及残余强度不断减小,试样内摩擦角变化则不太明显;接触面抗剪强度-干湿循环关系数学模型能很好反应不同干湿循环条件下峰值应力变化的一般规律,经验证与实际实验数据误差最小仅为4%,最大为12.8%,可为岩溶区输电基础桩岩界面基础力学研究提供理论依据。
The rock-embedded pile foundation of power transmission lines is mostly made of reinforced concrete.The wet-dry cycle in the actual environment has a significant impact on the basic mechanical properties of the rock and concrete structural surface of the rock-embedded pile foundation.In this paper,samples of limestone concrete structures were subjected to different numbers of wet dry cycles,and indoor normal stress tests were conducted to obtain the shear mechanical properties of different normal stresses.A mathematical model was established for the relationship between the shear strength of the limestone concrete contact surface and the number of wet dry cycles.Results revealed significant differences in shear stress-strain curves between limestone concrete and single limestone samples.As the number of wet-dry cycles of the samples increased,the structural plane's cohesive force,shear strength,and residual strength decreased.Internal friction angle changes were less noticeable.The model accurately reflects peak stress changes under different wet-dry conditions,with a minimum error of 4%and a maximum of 12.8%.This provides a theoretical basis for studying pile-rock interface mechanics in karst foundations.
作者
吕军旗
李飞
段国勇
马如梦
韩亮
LÜJun-qi;LI Fei;DUAN Guo-yong;MA Ru-meng;HAN Liang(College of Electrical and New Energy,Three Gorges University,Hubei Yichang 443000,Hubei Province,China;Hubei Three Gorges Vocational and Technical College,Hubei Yichang 443000,Hubei Province,China;Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Hubei Yichang 443000,Hubei Province,China)
出处
《中国农村水利水电》
北大核心
2025年第3期153-158,共6页
China Rural Water and Hydropower
基金
国家自然科学基金联合基金项目(U2034203,U22A20600)
2023年度宜昌市自然科学研究项目(A23-2-047)
湖北省教育厅2022年度科研计划项目(B2022567)。
关键词
灰岩
节理面
干湿循环
剪切试验
抗剪强度
limestone
joint surface
wet-dry cycle
shear test
shear strength
