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  2019, Vol. 38 Issue (S2): 3439-3447    DOI: 10.13722/j.cnki.jrme.2017.1495
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Improvement on the calculation method of slope critical acceleration under strong earthquake
QIN Yuqiao1,2,TANG Hua1,DENG Qin1,YIN Xiaotao1,DAN Luzhao3
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;2. University of Chinese Academy of Sciences,Beijing 100049,China; 3. Yunnan Dayong Highway Co.,Ltd.,Dali,Yunnan 671000,China)
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Abstract  Newmark rigid-block analysis is a permanent displacement calculation method which has been widely used in practice. However,the traditional method can only apply to the shallow linear slip surfaces which slip directions are close to the slope angle. In order to extend this method to circle slip surface and deep linear slip surface,the functions to calculate the seismic yield coefficient are improved based on the traditional methods. Then the permanent displacements of different slip surfaces are analyzed and compared with other Newmark methods including slices method and finite element decoupled method and the influences of slope height,angle and the form of slip surface on seismic yield coefficient are studied. Finally the proposed method is compared with large shaking table test. The results show that,when the slip surface is large,the traditional Newmark method is underestimated the permanent displacement of circle and deep linear slip surface. The improved Newmark method shows the great agreement with slicing methods and finite element decoupled method. The yield acceleration is related with stability coefficient,the range of slip surface and slope angle. The relationship between different levels of earthquake intensities and permanent displacement shows a good agreement with large shaking table test,which confirms that the modified Newmark method inherits the traditional method′s advantages and has better precision and wider application.
Key wordsslope engineering      seismic slope      permanent displacement      Newmark method      shaking table test     
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QIN Yuqiao1
2
TANG Hua1
DENG Qin1
YIN Xiaotao1
DAN Luzhao3
Cite this article:   
QIN Yuqiao1,2,TANG Hua1, et al. Improvement on the calculation method of slope critical acceleration under strong earthquake[J]. , 2019, 38(S2): 3439-3447.
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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1495      OR      http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS2/3439
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