泥石流块石冲击下新型拦挡坝动力响应试验研究  

Experimental study dynamic response of a new dam to the impact of block stones in debris flow

作　　者：李俊杰[1,2] 王秀丽[1,2] 冉永红[1,2] LI Junjie;WANG Xiuli;RAN Yonghong(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Center of Disas＆ Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology,Lanzhou 730050, China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《哈尔滨工程大学学报》2018年第5期889-896,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(51278236)

摘　　要：针对泥石流灾害拦挡工程结构型式缺乏创新以及相关试验研究工作欠缺问题,本文提出了两种钢-混凝土组合式新型拦挡坝型式。利用自主设计的冲击模拟试验台对坝体结构在固体冲击作用下的动力响应进行了试验研究和对比分析。结果表明:支撑体系的加强作用和耗能元件的耗能作用有效减轻了新型坝体实体坝身的破坏程度;重力坝动力响应衰减历时至少5倍于带支撑拦挡坝实体坝身,并且后者的动力响应峰值显著低于前者,坝体结构的整体刚度得到了明显增强;耗能坝实体坝身动力响应达到峰值所需耗时是重力坝的2倍有余,并且前者的动力响应峰值相较于后者明显降低,耗能元件的缓冲和耗能作用十分显著。Considering a lack of innovation in structural blocking projects against debris flow disaster and of related experimental research,two kinds of steel-concrete combined dams were proposed in this paper. Using a self-designed impact-simulating test bed,the experimental study and contrastive analysis of the dynamic response of the three dams under the action of solid impact were performed. Results show that the strengthening effect of a bracing system and the energy consumption effect of an energy-consuming component reduce the extent of damage to the two new dams. For the gravity dam,the attenuation period of its dynamic response was at least five times greater than that of the brace-supporting dam,and its peak dynamic response was significantly lower than the former. These results clearly indicate that the dam＇s overall stiffness was enhanced by braces. For the energy-absorbing dam,the time required to reach the peak dynamic response is more than twice than that of the gravity dam,and it peak dynamic response value is significantly lower than that of the gravity dam. The results show obvious results of the buffering and energy consumption effect of the abovementioned components.

关 键 词：钢-混凝土组合式新型拦挡坝 泥石流块石 动力响应 结构刚度 耗能作用 固体冲击试验 显式动力学 Holmquist-Johnson-Cook动态本构模型 

分 类 号：TU317[建筑科学—结构工程] X43[环境科学与工程—灾害防治]