摘要
桥梁箱梁结构在土石混合体滑坡或者崩塌灾害冲击下受损破坏现象较为普遍,而含石量和坡度是影响箱梁结构冲击和破坏的重要因素。因此,采用离散元素法(DEM)模拟不同含石量和坡度作用下刚性结构的动力响应。结果表明:含石量越大,坡度越大,颗粒流的动能耗散率耗时越短,冲击力越大;含石量对冲击力的影响程度比坡度小;土石耦合作用要比细颗粒土或块石颗粒单独作用对法向力影响大;基于模拟结果构建土石混合体冲击刚性结构的力学模型,推导出冲击力及其作用距离方程。为验证构建的力学模型的可靠性,将模型冲击力计算结果与Jiang模型、Adel模型及模拟结果进行对比发现模型的冲击力计算结果与模拟结果基本吻合。研究结果可为该类灾害的防治提供参考。
The damage of box girder bridge structures under the impact of soil-rock mixture landslide or collapse is rather common,and the stone content and slope are important factors affecting the impact and damage of box girder structures.A discrete element method(DEM)was used to simulate the dynamic responses of rigid structures under different composition of stone content and slope.The results show that the larger the stone content and the larger the slope,the shorter the kinetic energy dissipation time of the particle flow and the greater the impact force;the effect of the stone content on the impact force is less than that of the slope;the coupling action of soil and rock particles has a greater influence on the normal force than the single action of soil or rock particles.Based on the simulation results,a mechanical model for the impact of the soil-rock mixture on rigid structures was constructed,and the equation for the impact force and impact force action distance was derived.In order to verify the reliability of the constructed mechanical model,the calculation results of the impact force by the model were compared with those by the Jiang model,the Adel model and the simulation.It is found that the impact forces calculated according to the model are basically consistent with the simulation results.The research results provide a reference to the prevention and treatment of this type of disasters.
作者
成浩
韩培锋
苏有文
CHENG Hao;HAN Peifeng;SU Youwen(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China;Research Center on Mountain Torrent and Geologic Disaster Prevention,Ministry of Water Resources,Wuhan 430010,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2021年第14期268-278,共11页
Journal of Vibration and Shock
基金
广西岩土力学与工程重点实验室开放研究基金(20-Y-KF-03)
水利部山洪地质灾害防治工程技术研究中心开放基金(CKWV2019759/KY)
国家重点研发计划项目(2018YFC1505401)
国家自然科学基金(41877524
41971214)
四川省科技计划项目(2019YJ0667)
西南科技大学研究生创新基金(19ycx0087)。
关键词
含石量
坡度
土石混合体
冲击力
力学模型
stone content
slope
soil-rock mixture
impact force
impact model
作者简介
第一作者:成浩,男,硕士生,1994年生;通信作者:韩培锋,男,博士,讲师,1984年生。
