Analysis on dam-breaking mode of Tangjiashan barrier dam in Beichuan county |
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| Authors: | Xiewen Hu Gang Luo Xiaoping Lv Runqiu Huang Yubin Shi |
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| Institution: | (1) The State Key Laboratory of Geohazards Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan, China;(2) The International Institute for Geo-information Science and Earth Observation (ITC), Enschede, The Netherlands |
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| Abstract: | Tangjiashan landslide is a typical highspeed consequent landslide of medium-steep dip angle. This landslide triggered by earthquake
took place in about semi-minute. The relative sliding displacement is 900 meters, so average sliding speed is about 30 meters
per second. The longitudinal length of barrier dam which is formed by high-speed landslide along river is 803.4 meters; and
maximum width crossing river is 611.8 meters. And its volume is estimated about 20.37 million steres. Through detailed geological
investigation of the barrier dam, together with early geological information before earthquake, geological structures of the
barrier dam and its stability of upstream and downstream slopes are studied when water level reaches different elevations
in condition of continual after shocks with seismic intensity of 7 or 8 Richter scale. On this basis, dam-breaking mode of
barrier dam is discussed deeply. Thereby, analytic results provide significant guidance and advices to front headquarters
of Tangjiashan barrier dam, so that some proper engineering measures can be implemented and flood discharge can be carried
out well. |
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