运行车辆荷载对土石坝动力响应及振动影响范围分析  

Dynamic Response Characteristics and Vibration Influence Range of Earth and Rock Dam under Operating Vehicle Load

作　　者：章敏 高焱哲 曹克磊 呼梓旭 张建伟 ZHANG Min;GAO Yanzhe;CAO Kelei;HU Zixu;ZHANG Jianwei(Guangzhou Hongtao Survey and Design of Water conservancy and Hydropower Co.,Ltd.,Guangzhou 510405,China;School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]广州市宏涛水务勘测设计有限公司,广州510405 [2]华北水利水电大学水利学院,郑州450046

出　　处：《广东水利水电》2023年第8期49-57,共9页Guangdong Water Resources and Hydropower

基　　金：广州市科技计划项目(编号:2020-ky);广州市宏涛水务勘测设计有限公司科技攻关项目(编号:2022-07)。

摘　　要：针对车辆运行对土石坝产生的振动安全问题,以广东地区某水库大坝为研究对象,建立三维精细化仿真模型,采用稳态正弦波动荷载方法模拟移动车辆荷载,开展坝顶行车过程及车辆荷载对土石坝结构动力响应、振动作用范围的影响研究,分析不同车辆荷载作用下坝体力学特性及振动影响范围的变化规律。结果表明:坝体的竖向附加应力随车重增加而呈线性增大趋势;车辆沿路面产生的竖向附加应力随着深度的增加呈现出衰减的趋势;车辆对坝体产生的竖向变形,距离车辆中心越远竖向变形越小。车辆在平顺路面稳定行驶情况下,车辆荷载对坝顶路面以下0~0.4 m区间内竖向应力影响较大,坝体应力随深度(距坝顶路面)的增加呈衰减趋势;车辆行驶过程中单个车轮对坝体的影响范围约为1 m,应力变化情况呈倒马鞍形分布。Aiming at the vibration safety problem caused by vehicle operation on earth-rock dams,a three-dimensional fine simulation model was established taking a reservoir dam in Guangdong as the research object,and the steady-state sinusoidal fluctuation load method was used to simulate the load of moving vehicles,and the influence of the driving process of the dam top and the vehicle load on the dynamic response and vibration range of the earth-rock dam structure was studied,and the changes of the mechanical characteristics and vibration influence range of the dam body under different vehicle loads were analyzed.The results show that the vertical additional stress of the dam body increases linearly with the increase of vehicle weight.The vertical additional stress generated by the vehicle along the road surface shows a tendency to attenuate with the increase of depth.The vertical deformation of the dam body caused by the vehicle is smaller the farther away from the center of the vehicle.Under the condition of stable driving on smooth road,the vehicle load has a great influence on the vertical stress in the 0~0.4 m range below the dam top road surface,and the dam stress shows a attenuation trend with the increase of depth(from the top road surface).The influence range of a single wheel on the dam body during vehicle driving is about 1 m,and the stress change is distributed in the shape of an inverted saddle.

关 键 词：车辆荷载 坝顶路面 碾压式均质土坝 数值仿真 

分 类 号：TV641[水利工程—水利水电工程] TU43[建筑科学—岩土工程]