防灾减灾工程学报2025，Vol.45Issue(4)：712-725,14.DOI:10.13409/j.cnki.jdpme.20250125001
持续性强降雨条件下湿陷性黄土地区输电铁塔基础稳定性研究
Research on Stability of Transmission Tower Foundations in Collapsible Loess Areas under Continuous Heavy Rainfall Conditions
摘要
Abstract
Under continuous heavy rainfall conditions,the hydraulic gradient of loess increases,and the soil transitions from an unsaturated to a saturated state,which can easily lead to instability of trans-mission tower foundations in loess areas.To investigate the influence of rainfall on the stability of tow-er foundations in collapsible loess areas,a seepage-stress coupling model for tower foundations was es-tablished based on the Mohr-Coulomb model for unsaturated soil.This model incorporated the nonlin-ear relationships between soil cohesion,internal friction angle,density,Poisson's ratio,and satura-tion,considering the coupling between rainfall infiltration and the stress field.Using this model,the spatiotemporal evolution patterns of hydraulic characteristics in collapsible loess foundations under rainfall were revealed,and the spatial strain and stress response characteristics of the foundation-soil system were analyzed under four rainfall patterns:early-peak,late-peak,mid-peak,and uniform pat-terns.The results showed that under the same total rainfall and additional stress conditions,the latter two rainfall patterns caused the most significant disturbance to the foundations in collapsible loess ar-eas,with the early-stage cumulative settlement of the foundation being significantly greater than that under early-peak and late-peak patterns.During the rainfall infiltration process,the vertical effective stress in the infiltrated soil gradually decreased,and the absolute value of the negative lateral friction resistance at the foundation-soil interface increased accordingly.A comparative analysis of the anti-set-tlement performance of three common foundation types—excavated,cast-in-place pile,and stepped foundations—in collapsible loess areas during the rainfall process revealed that the excavated founda-tion can effectively delay the development of negative friction resistance due to its enlarged head struc-ture,demonstrating excellent resistance to collapsible settlement.关键词
湿陷性黄土/输电铁塔基础/降雨条件/流固耦合/基础稳定性Key words
collapsible loess/transmission tower foundation/rainfall conditions/fluid-solid interaction/foundation stability分类
建筑与水利引用本文复制引用
陈彬,吴家乐,贾燕峰,楚明月,李飚,杨松林..持续性强降雨条件下湿陷性黄土地区输电铁塔基础稳定性研究[J].防灾减灾工程学报,2025,45(4):712-725,14.基金项目
国网河南省电力公司科技项目(5217I0240003)资助 （5217I0240003）
