摘要
泥石流冲毁桥墩对桥梁的危害巨大。借助数值模拟分析手段,研究不同截面形式的桥墩在泥石流冲击作用下的差异。综合分析泥石流流域、桥墩受到的冲击压强、冲击力以及拉应力,得到泥石流作用下最优桥墩选型。研究表明,不同截面的桥墩对泥石流浆体的分布影响较大,圆端形墩和尖端形墩的排导能力优于矩形墩;不同截面形状的桥墩受到的冲击力差异明显,矩形墩对泥石流的阻力普遍大于圆端形墩和尖端形墩。综合模拟结果分析,建议在泥石流易发区域架设桥梁时,应优先选择圆形或者圆端形墩。
Debris flow destroys piers which brings great damage to bridges.By means of numerical simulation,the differences of piers with different cross-sections under the impact of debris flow are studied.Comprehensive analysis of impact pressure,impact force and tensile stress on piers in debris flow basin is conducted to get the optimal pier selection under the action of debris flow.The results show that piers with different cross-sections have great influence on the distribution of debris flow slurry,and the discharge capacity of round-end piers and pointed piers is better than that of rectangular piers.The impact force of piers with different cross-sectional shapes is obviously different,and the resistance of rectangular piers to debris flow is generally greater than that of round-ended piers and pointed piers.Based on the analysis of simulation results,it is suggested that circular or round-ended piers should be preferred when erecting bridges in debris flow prone areas.
作者
滕禹亮
李睿
黄佳鑫
简平
何嘉
TENG Yu-liang;LI Rui;HUANG Jia-xin;JIAN Ping;HE Jia(School of Architectural Engineering,Kunming University of Science and Technology,Kunming 650500,China;Pu’er Local Highway Management Office,Pu’er 665099,China;Yunnan Ruide Road and Bridge Engineering Design Co.Ltd.,Kunming 650500,China)
出处
《公路》
北大核心
2021年第6期109-115,共7页
Highway
基金
国家自然科学基金项目,项目编号51568029
云南省交通厅科技开发项目,项目编号云交科2013(c)08。
关键词
泥石流
桥墩
冲击力
数值模拟
影响分析
debris flow
pier
impact force
numerical simulation
influence analysis
