摘要
【目的】针对强风和暴雨天气下黄河滩区粉土地基输电线杆倾覆失稳问题,分析天气条件、杆体埋深及土体压实度对输电线杆稳定性的影响,揭示风雨作用下的倾覆破坏机理,为工程安全设计提供理论依据。【方法】通过室内模型试验与数值模拟相结合的方法,分析不同风力等级(模拟风荷载)、降雨强度(控制土体含水率)、杆体埋深及土体压实度条件下输电线杆的杆顶位移、倾斜率及周围土体位移场变化规律,探究粉土强度劣化与杆体倾覆的关联性。【结果】①土体含水率升高显著扩大杆后土体塑性区范围;②风力等级与埋深需求呈线性关系,风力每增强1级,最小安全埋深需增加0.25 m;③提高土体压实度可有效抑制变形,压实度每提升5%,输电线杆最小安全埋深减少0.10 m;④综合参数分析建立了风雨作用下输电线杆的最小安全埋深经验公式。【结论】输电线杆抗倾覆稳定性受风雨作用与土体参数协同影响,通过提升压实度及优化埋深可显著增强安全性;所提经验公式可为黄河滩区粉土地基输电线杆设计提供量化参考,兼顾经济性与可靠性。
【Objective】To address the overturning instability of transmission poles in silty soil foundations in the Yellow River floodplain under extreme wind and rainstorm conditions,the impacts of weather conditions,burial depth,and soil compaction on pole stability are investigated.The failure mechanisms induced by coupled wind-rain effects are elucidated,providing theoretical foundations for safer engineering designs.【Methods】A combination of indoor model tests and numerical simulations was employed to analyze variations in pole-top displacement,tilt rate,and surrounding soil displacement fields of transmission poles under different wind grades(simulated wind loads),rainfall intensities(controlled soil moisture content),burial depths,and soil compaction degrees.The correlation between the silty soil strength degradation and pole overturning was systematically examined.【Results】(1)Increased soil moisture content significantly expanded the plastic zone in the soil behind the pole.(2)A linear relationship was observed between wind grade and required burial depth,with a 0.25 m increase in minimum safe burial depth per wind force increment.(3)Enhanced soil compaction effectively suppressed deformation—for every 5%increase in compaction,the minimum safe burial depth of transmission pole decreased by 0.10 m.(4)A comprehensive parameter analysis led to the establishment of an empirical formula for determining the minimum safe burial depth under wind-rain conditions.【Conclusion】The anti-overturning stability of transmission poles is jointly influenced by windrain coupling effects and soil parameters.Enhancing compaction and optimizing the burial depth can significantly improve safety.The proposed empirical formula provides quantitative design references for transmission poles in silty soil foundations of the Yellow River floodplain,effectively balancing economy and reliability.
作者
闫长斌
程沛铭
南钰
郑罡
海岳
时刚
YAN Changbin;CHENG Peiming;NAN Yu;ZHENG Gang;HAI Yue;SHI Gang(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Kaifeng Power Supply Company,State Grid Henan Electric Power Company,Kaifeng 475000,China)
出处
《华北水利水电大学学报(自然科学版)》
北大核心
2025年第4期119-131,共13页
Journal of North China University of Water Resources and Electric Power:Natural Science Edition
基金
国家自然科学基金项目(41972270)
国网河南省电力公司科技项目(521790220002)
河南省重点研发与推广专项(222102320118)。
关键词
风荷载
土体含水率
黄河滩区
粉土
输电线杆
倾覆失稳
最小安全埋深
wind loads
soil moisture content
Yellow River floodplain
silty soil
transmission poles
overturning instability
minimum safe burial depth
