Landslides occurring in sensitive clay often result in widespread destruction,posing a significant risk to human lives and property due to the substantial decrease in undrained shear strength during deformation.Assess...Landslides occurring in sensitive clay often result in widespread destruction,posing a significant risk to human lives and property due to the substantial decrease in undrained shear strength during deformation.Assessing the consequences of these landslides is challenging and necessitates robust numerical methods to comprehensively investigate their failure mechanisms.While studies have extensively explored upward progressive landslides in sensitive clays,understanding downward progressive cases remains limited.In this study,we utilised the nodal integration-based particle finite element method(NPFEM)with a nonlinear strain-softening model to analyse downward progressive landslides in sensitive clay on elongated slopes,induced by surcharge loads near the crest.We focused on elucidating the underlying failure mechanisms and evaluating the effects of different soil parameters and strainsoftening characteristics.The simulation results revealed the typical pattern for downward landslides,which typically start with a localised failure in proximity to the surcharge loads,followed by a combination of different types of failure mechanisms,including single flow slides,translational progressive landslides,progressive flow slides,and spread failures.Additionally,inclined shear bands occur within spread failures,often adopting distinctive ploughing patterns characterised by triangular shapes.The sensitive clay thickness at the base,the clay strength gradient,the sensitivity,and the softening rate significantly influence the failure mechanisms and the extent of diffused displacement.Remarkably,some of these effects mirror those observed in upward progressive landslides,underscoring the interconnectedness of these phenomena.This study contributes valuable insights into the complex dynamics of sensitive clay landslides,shedding light on the intricate interplay of factors governing their behaviour and progression.展开更多
The CAS Awards for Natural Sciences and the CAS Awards for S&T Progress are two major awards issued by the Chinese Academy of Sciences. The former is to recognize the scientific findings and research results by wh...The CAS Awards for Natural Sciences and the CAS Awards for S&T Progress are two major awards issued by the Chinese Academy of Sciences. The former is to recognize the scientific findings and research results by which CAS scientists bring to light natural phenomena, laws and properties in their basic and applied basic research. The latter is to award major inventions or research results produced by CAS scientists that have contributed greatly to the promotion of S&T progress, and social and economic development. In 1997, 68 research projects won the CAS Awards for Natural Sciences, and 106 research works won CAS Awards for S&T Progress. The following are profiles of some of the prize-wining projects.展开更多
GENERALProgress in Natural Science, a comprehensive academic journal sponsored by the National Natural Science Foundation of China, is published monthly by Science in China Press and Taylor & Francis Ltd. This jou...GENERALProgress in Natural Science, a comprehensive academic journal sponsored by the National Natural Science Foundation of China, is published monthly by Science in China Press and Taylor & Francis Ltd. This journal aims at presenting the up-to-date scientific achievements with high creativity and great significance in every field of natural science. Contributions from authors of other nationalities are also welcome.展开更多
基金support provided by the UK Engineering and Physical Sciences Research Council(EP/V012169/1).
文摘Landslides occurring in sensitive clay often result in widespread destruction,posing a significant risk to human lives and property due to the substantial decrease in undrained shear strength during deformation.Assessing the consequences of these landslides is challenging and necessitates robust numerical methods to comprehensively investigate their failure mechanisms.While studies have extensively explored upward progressive landslides in sensitive clays,understanding downward progressive cases remains limited.In this study,we utilised the nodal integration-based particle finite element method(NPFEM)with a nonlinear strain-softening model to analyse downward progressive landslides in sensitive clay on elongated slopes,induced by surcharge loads near the crest.We focused on elucidating the underlying failure mechanisms and evaluating the effects of different soil parameters and strainsoftening characteristics.The simulation results revealed the typical pattern for downward landslides,which typically start with a localised failure in proximity to the surcharge loads,followed by a combination of different types of failure mechanisms,including single flow slides,translational progressive landslides,progressive flow slides,and spread failures.Additionally,inclined shear bands occur within spread failures,often adopting distinctive ploughing patterns characterised by triangular shapes.The sensitive clay thickness at the base,the clay strength gradient,the sensitivity,and the softening rate significantly influence the failure mechanisms and the extent of diffused displacement.Remarkably,some of these effects mirror those observed in upward progressive landslides,underscoring the interconnectedness of these phenomena.This study contributes valuable insights into the complex dynamics of sensitive clay landslides,shedding light on the intricate interplay of factors governing their behaviour and progression.
文摘The CAS Awards for Natural Sciences and the CAS Awards for S&T Progress are two major awards issued by the Chinese Academy of Sciences. The former is to recognize the scientific findings and research results by which CAS scientists bring to light natural phenomena, laws and properties in their basic and applied basic research. The latter is to award major inventions or research results produced by CAS scientists that have contributed greatly to the promotion of S&T progress, and social and economic development. In 1997, 68 research projects won the CAS Awards for Natural Sciences, and 106 research works won CAS Awards for S&T Progress. The following are profiles of some of the prize-wining projects.
文摘GENERALProgress in Natural Science, a comprehensive academic journal sponsored by the National Natural Science Foundation of China, is published monthly by Science in China Press and Taylor & Francis Ltd. This journal aims at presenting the up-to-date scientific achievements with high creativity and great significance in every field of natural science. Contributions from authors of other nationalities are also welcome.
