Influence of non-dimensional strength parameters on the seismic stability of cracked slopes

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英文篇名：Influence of non-dimensional strength parameters on the seismic stability of cracked slopes 作者：ZHAO ; Lian-heng ; CHENG ; Xiao ; LI ; De-jian ; ZHANG ; Ying-bin 英文作者：ZHAO Lian-heng;CHENG Xiao;LI De-jian;ZHANG Ying-bin;School of Civil Engineering, Central South University;Key Laboratory of Heavy-haul Railway Engineering Structure, Ministry of Education, Central South University;Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University;Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University; 英文关键词：Cracked slopes;;Upper bound limit analysis (UBLA);;Generalized nonlinear failure criterion;;Pseudo-static method;;Displacement-based method 中文刊名：Journal of Mountain Science 英文刊名：Journal of Mountain Science 山地科学学报(英文版) 机构：School of Civil Engineering, Central South University;Key Laboratory of Heavy-haul Railway Engineering Structure, Ministry of Education, Central South University;Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University;Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University; 出版日期：2019-01-15 出版单位：Journal of Mountain Science 年：2019 期：01 基金：financially supported by the National Key Research and Development Program of China (2017YFC1501001);; National Natural Science Foundation of China (51478477, 41672286, 51408511, 41530639 and 41761144080);; Science & Technology Department of Sichuan Province(2017JQ0042);; the program of China Scholarship Council 语种：英文; 页：156-170 页数：15 CN：51-1668/P ISSN：1672-6316 分类号：TU435

摘要

Cracks in rock or soil slopes influence the stability and durability of the slopes. Seismic forces can trigger slope disasters, particularly in the cracked slopes. Considering the nonlinear characteristics of materials, the more generalized nonlinear failure criterion proposed by Baker is adopted. The influence of non-dimensional strength parameters on the stability of cracked slopes under earthquakes is performed using the upper bound limit analysis. The seismic displacement is calculated by adopting the logarithmic spiral failure surface according to the sliding rigid block model. Based on the existing studies, two methods for the stability analysis of cracked slopes under earthquakes are introduced: the pseudo-static method(with the factor of safety(Fs) as an evaluation index), and the displacement-based method(with the seismic displacement as an evaluation index). The pseudo-static method can only determine the instantaneous stability state of the cracked slope, yet the displacement-based methodreflects the stability variation of cracked slopes during earthquakes. The results indicate that the nondimensional strength parameters affect the factor of safety and seismic displacement of slopes significantly. The non-dimensional strength parameter(n) controlling the curvature of strength function shapes on the slope stability is affected by other parameters. Owing to cracks, the effect of non-dimensional strength parameters on seismic displacement becomes more significant.
        Cracks in rock or soil slopes influence the stability and durability of the slopes. Seismic forces can trigger slope disasters, particularly in the cracked slopes. Considering the nonlinear characteristics of materials, the more generalized nonlinear failure criterion proposed by Baker is adopted. The influence of non-dimensional strength parameters on the stability of cracked slopes under earthquakes is performed using the upper bound limit analysis. The seismic displacement is calculated by adopting the logarithmic spiral failure surface according to the sliding rigid block model. Based on the existing studies, two methods for the stability analysis of cracked slopes under earthquakes are introduced: the pseudo-static method(with the factor of safety(Fs) as an evaluation index), and the displacement-based method(with the seismic displacement as an evaluation index). The pseudo-static method can only determine the instantaneous stability state of the cracked slope, yet the displacement-based methodreflects the stability variation of cracked slopes during earthquakes. The results indicate that the nondimensional strength parameters affect the factor of safety and seismic displacement of slopes significantly. The non-dimensional strength parameter(n) controlling the curvature of strength function shapes on the slope stability is affected by other parameters. Owing to cracks, the effect of non-dimensional strength parameters on seismic displacement becomes more significant.

引文

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