Study on the Effect of Streambed Structures in Spillways of Landslide Dams
An 8. 0 Ms earthquake occurred at Wenchuan (31°0116N, 103°2201E), China on May 12, 2008. The earthquake-hit area was mainly mountainous district lying on the margin of Tibetan plateau and therefore numerous disasters such as avalanches and landslides were triggered. These mass movements created many landslide dams and quake lakes along the earthquake belt. Some of them were regarded dangerous because massive amounts of the lake water might break the dam and potentially endangering the downstream people. Thus their stability is very important in the security control. In this paper, the influences of streambed structures on the landslide dams stability were studied through the field measurement work in 5/12 Wenchuan earthquake-hit area. The results indicated that streambed structures were developed with huge stones or clusters of big stones in many landslide dam spillways during water scour, stabilizing the dams due to their high resistance to erosion. And with the enhancement of steambed structure intensity Sp, erosion was impeded and local geomorphol-ogy features such as longitudinal profiles was altered. The preservation proportion of landslide dams are in direct ratio to steambed structure intensity. And coarser grain size of dams leaded to larger intensity. Therefore It was revealed that the development of streambed structures and finally the preservation proportion of dams could be estimated according to the grain size distribution, so that the stability of these dams could be assessed.
Huaixiang Liu Zhaoyin Wang Chengwei Xu Guoan Yu
State Key Laboratory of Hydrology-Water Resources and Hydraulic engineering,Nanjing Hydraulic Resear Department of Hydraulic and Hydropower Engineering, Tsinghua University, Beijing, 100084
国际会议
南京
英文
653-659
2010-09-13（万方平台首次上网日期，不代表论文的发表时间）