Numerical simulation of limit pressure against debris flow for the 8th August,2010 Sanyanyu debris flow in China:A case study
On 8th August, 2010, the catastrophic debris flows in Zhouqu County, China, shocked the world.The event destroyed more than 200 houses, killing some 1700 people.Field investigation indicated that nine masonry check dams built in the 1990s and after Wenchuan Earthquake of 12th May 2008 (Ms =8.0) have been destroyed by the debris flows.In this paper, the limit pressure against debris flow has been studied by FLAC3D analysis software.Taking the check dam No.3 as an example, the practical pressure of debris flow was calculated to be 98.8 kPa, which was greater than the previous design value of 66 kPa.Consequently, the inadequate design standard for check dams was the main reason for check dam destruction.In the process of reconstruction, the previous masonry check dams have been replaced by reinforced concrete gravity dams.By means of FLAC3D, the limit pressure against debris flow for concrete gravity dam reached 170 kPa, which was much geater than the calculated pressure (98.8 kPa).The results of numerical simulation indicated that the new structure (i.e.concrete gravity dam) was sturdy enough to withstand a large scale debris flow such as the 2010 Sanyanyu debris flow.The research will be valuable for improving protective measures against debris flow in disaster area of Zhouqu County.
G.L.Wang S.Qi H.Lan
Key Laboratory of Geo-Hazards in Loess Area,Xi an Center of Geological Survey,China Geological Surv Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China Institute of Geography Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,C
国际会议
International Symposium and 9th Asian Regional Conference of IAEG(第9届IAEG亚洲区域会议)
北京
英文
173-177
2013-09-23（万方平台首次上网日期，不代表论文的发表时间）