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| 1 | Effects of Material Composition and Water Content on the Mechanical Properties of Landslide Deposits Triggered by the Wenchuan Earthquake显示文摘Abundant landslide deposits were triggered by the Wenchuan earthquake,providing a rich source of material for subsequent debris flows or slope failures under rainfall conditions.A good understanding of the physical and mechanical properties of the landslide deposits is very important to the research on slope failure mechanisms and the initiation of debris flow.Laboratory biaxial compression tests are used to study the material compositions and water content impacts on the mechanical properties of landslide deposits,and a discrete element method(a bond-contact model)is used to study the particle stiffness,bond force,friction coefficient and confining stress impact on the mechanical behaviors and the relationships between the numerical and experimental parameters.The experimental results show that the failure stress of landslide deposits is decreased with increasing content of fine particles and also with increased water content,especially at the initial increasing stage.Cohesion of the saturated landslide deposits is increased,but the friction angle is decreased with the increase in the fine particle content.Shear strength parameters(the cohesion and friction angle)are decreased with the increasing water content at the initial increasing stage,and then,they slowly decrease.There is a critical value of the water content at 5%-7%(in weight)for the failure stress and shear strength parameters of the landslide deposits.Quadratic equations are presented to describe the relation between the bond force and cohesion,and the numerical friction coefficient and the experimental friction angle. | ZHOU Jiawen CUI Peng YANG Xingguo | 2016 | Acta Geologica Sinica(English Edition)2016，90，1： | 9 |
| 2 | A Hazard Assessment Method for Potential Earthquake-Induced Landslides – A Case Study in Huaxian County, Shaanxi Province显示文摘The hazard assessment of potential earthquake-induced landslides is an important aspect of the study of earthquake-induced landslides. In this study, we assessed the hazard of potential earthquake-induced landslides in Huaxian County with a new hazard assessment method. This method is based on probabilistic seismic hazard analysis and the Newmark cumulative displacement assessment model. The model considers a comprehensive suite of information, including the seismic activities and engineering geological conditions in the study area, and simulates the uncertainty of the intensity parameters of the engineering geological rock groups using the Monte Carlo method. Unlike previous assessment studies on ground motions with a given exceedance probability level, the hazard of earthquake-induced landslides obtained by the method presented in this study allows for the possibility of earthquake-induced landslides in different parts of the study area in the future. The assessment of the hazard of earthquake-induced landslides in this study showed good agreement with the historical distribution of earthquake-induced landslides. This indicates that the assessment properly reflects the macroscopic rules for the development of earthquake-induced landslides in the study area, and can provide a reference framework for the management of the risk of earthquakeinduced landslides and land planning. | LIU Jiamei GAO Mengtan WU Shuren WANG Tao WU Jian | 2016 | Acta Geologica Sinica(English Edition)2016，90，2： | 8 |
| 3 | 青藏高原东北缘黄河上游滑坡与堰塞湖研究进展显示文摘随着黄河流域生态保护与高质量发展上升为国家战略,滑坡灾害防治成为迫切需要攻克的基础性问题。另外,黄河上游地区因地形高差大、古地震及强降雨事件频繁,诱发的滑坡及滑坡堰塞湖数量多、分布广、危害重,是近年来滑坡发育和演化机制以及滑坡堰塞湖溃决效应研究的热点。本文在综合整理该地区已有研究工作的基础上,结合笔者研究团队近20年来所获得的滑坡调查评价、测试分析和防灾减灾研究成果,系统归纳了黄河上游地区滑坡调查与风险评价、滑坡时空展布规律及主控因素研究、典型滑坡堰塞湖的续存时长及溃决危害、古滑坡堆积体开发利用及防灾减灾等方面的研究进展和成果,提出了未来在该地区研究古滑坡、堰塞湖沉积与河流阶地以及堰塞湖溃决效应等应关注的4个科学问题。研究结果对于揭示黄河上游地质历史时期滑坡发育和堰塞湖形成的主控因素,探讨滑坡发育的动力机制对地震和降雨的响应过程,拓展第四纪地质学在古滑坡形成演变方面的应用研究等具有重要参考价值。 | 殷志强 魏刚 秦小光 李文娟 赵无忌 | 2021 | 地学前缘2021，28，2： | 6 |
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