摘要
为了克服传统分析方法将泥石流拦挡结构视为完全弹性体的不足,引入混凝土塑性损伤本构模型.运用通用有限元软件ABAQUS,基于显示动力学,对某泥石流格栅式拦挡结构的不同设计方案,在不同冲击荷载作用下的位移响应及损伤破坏进行了对比分析.结果表明:拦挡结构与周围基岩山体连接部位的损伤破坏较为严重,构成整个拦挡结构的桩体的损伤破坏主要发生在下部,并逐渐向上扩展.前排迎泥石流冲击作用的桩截面设计为弧形可相对改善其对泥石流的抵抗能力.前后排桩采用人字梁进行连接时可提高结构的整体性,增强其抵抗泥石流冲击破坏的能力.巨石的冲击作用引起结构位移反应的增大,对直接遭受冲击作用的桩影响较大,同时对其邻桩及边桩产生影响.
In order to overcome the shortcomings of traditional analysis of considering the structure of dam against debris flow as elastic body, the concrete plasticity damage constitutive model is introduced. The displacement response and destroy damage for different designs of structure of a dam against debris flow, at different impact loads, are analyzed and compared by general-purpose finite element software ABAQUS. The results show- The connected part of dam structure and the surrounding bedrock mountain suffers more serious damage. The main failure occurs mainly in the lower part in the composition of the blocking structure of pile body, and gradually extends upwards. The arcuate cross-section is designed for the front piles to improve their relative resistance to debris flow impact. The piles in front and back rows are connected by Y-shaped beam to improve the integrity of the structure,and thus enhance the ability to resist destruction of debris flow impact. The impact of the rock causes the increase of the structural displacement response, the impact of the directly subjected piles is greater, at the same time, it also has an impact on adjacent piles and other piles.
出处
《西安工业大学学报》
CAS
2015年第12期984-992,共9页
Journal of Xi’an Technological University
基金
水利部公益性行业科研专项基金资助项目(201501034-04)
陕西省科技统筹创新工程重点实验室项目(2014SZ15-Z01)
关键词
泥石流拦挡坝
混凝土损伤
动力响应
结构位移
dam against debris flow
concrete damage
dynamic response
structural displacement
