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| DYNAMIC CACULATION METHOD OF FRAME PRESTRESSED ANCHORS FOR SLOPE STABILITY UNDER SEISMIC EFFECT |
| DONG Jianhua1,2,3,ZHU Yanpeng1,2,MA Wei3 |
(1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;3. State Key Laboratory of Frozen Soil Engineering,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,
Lanzhou,Gansu 730000,China) |
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Abstract In order to accurately carry out dynamic analysis and seismic design of the new slope anchorage structure,the study of its dynamic properties and seismic design theory is very necessary and urgent. The movement characteristics satisfy the theory of elastic foundation beam under the prestressed anchor action. A dynamic calculation model of frame with prestressed anchors for slope stability is established based on Winkle elastic beam theory. Under the horizontal earthquake excitation,the equation of vibration for slope supported by frame with prestressed anchors and slope is deduced considering the influence of beam and retaining plate,and the analytical solution is obtained. Finally,the proposed method is applied to a project case for illustrating its capability of earthquake response. In order to investigate the effectiveness and reliability of this method,it is compared with finite element method and shaking table test,the results show a good agreement. The analysis of slope with supporting and without supporting reveals that this structure can evidently decrease the earthquake response and has better seismic performance. The calculation model provides a new approach for earthquake analysis and seismic design of slope supported by frame supporting structure with prestressed anchor.
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Received: 18 October 2012
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