摘要
采用弹性–重力相似关系设计了一组混凝土面板堆石坝(面板坝)振动台模型试验,研制开发了仿真面板材料,设计了一套图像采集、存储与分析系统。根据图像识别技术分析结果以及模型的数值计算分析结果,详细分析了面板坝面板错台机理,并与汶川地震中紫坪铺面板坝面板错台震害进行了对比分析。研究结果表明,地震造成的堆石体永久变形对面板产生的向下摩擦力和向外推力是造成面板错台的主要原因。模型试验结果与数值计算结果和实际震害基本吻合,表明振动台模型试验可以再现原型的主要破坏特征。
Shaking table model tests on concrete faced rock-fill dams are designed according to the elasticity-gravity similarity rules. Face-slab model materials are developed, and a system for the image collection, storage and pattern recognition is presented. On the basis of the results of the PIV analysis and the numerical simulation, the dislocation mechanism of the face-slab under earthquakes is analyzed, and the results are compared with the real dislocation damage of Zipingpu Dam during Wenchuan Earthquake. The results of the model tests agree with those of numerical simulation. Both of them reveal the slab dislocation phenomenon of Zipingpu Dam. The results show that the main reasons of the face-slab dislocation are the thrust force towards the upstream and the friction force towards the downstream along the slab due to the permanent deformation of the rock-fill. Shaking table model tests can reflect the main damage characteristics of the prototype dams.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2012年第2期258-267,共10页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(90815024
50978045)
辽宁省创新团队项目(2009T017)
关键词
面板堆石坝
振动台模型试验
图像识别
PIV
紫坪铺
面板错台
concrete faced rock-fill dam
shaking table model test
pattern recognition
PIV
Zipingpu Dam
face-slab dislocation
