防灾减灾工程学报2026，Vol.46Issue(2)：400-408,9.DOI:10.13409/j.cnki.jdpme.20250227002
复杂地形下碎屑流冲击混凝土桥墩的损伤机理研究
Study on Damage Mechanisms of Concrete Piers Impacted by Debris Flow in Complex Terrain
摘要
Abstract
To investigate the disaster-causing mechanisms of debris flow impact on concrete piers in complex terrain within hazardous mountainous areas,simulation tests were conducted using discrete element software PFC3D on three types of slope flumes:convex,linear,and concave.The movement patterns and accumulation characteristics of the debris flow were analyzed,and the damage evolution patterns of concrete piers under dynamic impact of debris flow were deeply studied.The results indicat-ed that the debris flow on the concave slope exhibited the largest start-up velocity and the highest peak average velocity(6.38 m/s),but the shortest movement duration.In contrast,the debris flow on the convex slope showed the smallest start-up velocity and the lowest peak average velocity(2.53 m/s),but the longest movement duration.The debris flow accumulation on the convex slope was the most dispersed,covered the widest disaster area,and resulted in the greatest accumulation height in front of the pier,while the accumulation patterns on the concave slope exhibited the opposite trend.The peak impact force of the debris flow on the pier under the convex slope condition was the largest in both the X and Z directions,and the displacement response at the pier top was the most significant(5.0 mm).Under the concave slope condition,the peak impact force of the debris flow on the pier was the small-est in all three directions,and the pier-top displacement was minimal at only 1.07 mm.The pier dam-age was the most severe under the convex slope terrain,with the largest damage height range(0.27 m to 1.32m from the bottom of the pier),followed by the linear slope,while the concave slope exhibited the smallest damage height range(0.06 m to 0.31 m).The pier damage rate followed the same ranking as the peak impact force in the main impact direction(X-direction):convex slope>linear slope>con-cave slope.The research findings can provide a reference for the prevention and mitigation of debris flow impact disasters on bridges in hazardous mountainous areas.关键词
碎屑流/混凝土桥墩/复杂地形/数值模拟/冲击损伤Key words
debris flow/concrete pier/complex terrain/numerical simulation/impact damage分类
交通工程引用本文复制引用
程麦理,郭少恒,拓鹏鹏,程巨田..复杂地形下碎屑流冲击混凝土桥墩的损伤机理研究[J].防灾减灾工程学报,2026,46(2):400-408,9.基金项目
国家自然科学基金项目(52368026)、陕西省自然科学基础研究计划项目(2023-JC-YB-437)资助 （52368026）
