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吕 珩
(郑州市公路工程公司 ,郑州 450000)
摘 要 :在雨季边坡土体易发生水土流失 ,导致出现滑坡或者塌陷现象 , 因此考虑降雨工况下的边坡稳定性是十分有必要的。利用有限元软件建立降雨入渗与普通两类高路堑边坡二维模型 ,对比分析暴雨与常态工况下的边坡孔隙水压力 、位移变形与安全系数 ,综合相应评价标准判断边坡是否处于稳定状态。结果表明:暴雨影响下表层岩土体孔隙水压力显著增大 ,表层岩土体孔隙水压力增加速率快于深部 ,其危险点位于坡脚 ;降雨24 h 后的三级边坡坡底水平位移 、坡脚向上位移 、坡顶沉降均达峰值 ,位移突变时间点为降雨 18 h 后;降雨 24 h后边坡安全系数低于 1 . 0 , 且于降雨 18 h 后发生突变 ,边坡存在滑坡风险 ,应于降雨 18 h 前采取加固措施。
关键词: 降雨渗流 ;高速公路 ;高路堑边坡 ;稳定性分析 ;数值模拟
中图分类号:U451 文献标志码:A 文章编号: 1005- 8249 (2026) 01- 0095- 06
DOI:10. 19860/j.cnki.issn1005 - 8249.2026.01 .017
LV Heng
(Zheng Zhou City Highway Engineering Company , Zhengzhou 450000 , China)
Abstract : Slope soil is prone to soil erosion during the rainy season , which may result in landslides or collapses . Therefore , it is essential to evaluate slope stability under rainfall conditions . Finite element software was used to establish two - dimensional models of high cutting slopes with and without rainfall infiltration. The pore water pressure , displacement deformation , and safety factors of the slopes under heavy rain and normal conditions were analyzed and compared . The stability of the slopes was assessed based on the corresponding evaluation criteria. The results indicate that under the influence of heavy rain , the pore water pressure in the surface soil and rock mass significantly increases , with the rate of increase being faster than that in the deeper layers , and the danger point is located at the slope toe . After 24 hours of rainfall , the horizontal displacement at the base of the third - tier slope , the upward displacement at the slope toe , and the settlement at the slope crest all reach their peak values , with the displacement mutation occurring at 18 hours after the start of rainfall . After 24 hours of rainfall , the safety factor of the slope drops below 1 . 0 , and a sudden change occurs after 18 hours of rainfall , indicating a risk of landslides . Reinforcement measures should be implemented before 18 hours of rainfall .
Key words : rainfall seepage; expressway; high cutting slope; stability analysis; numerical simulation
作者简介: 吕 珩 (1976—) , 男 ,本科 ,高级工程师 ,研究方向:道路与桥梁工程。
收稿日期:2023 - 06 - 29
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