{"title":"考虑率相关摩擦规律的粒间摩擦减弱对滑坡动力学的影响","authors":"Yafeng Chen, Guoqing Chen, Qiang Xu, Hao Wen","doi":"10.1007/s10064-025-04486-7","DOIUrl":null,"url":null,"abstract":"<div><p>Laboratory experiments have revealed that the friction coefficient within landslide shear bands exhibits rate dependence, which is the key factor in explaining the mechanism of high-speed and long-runout movement. However, the rate-dependent effect is overlooked due to the constant frictional value in the conventional Coulomb Friction (CF) law. To address this limitation, we propose using the relative shear rate between particles as an indicator, and integrating the Rate-dependent Friction (RF) law with the discrete element method to investigate the effects of interparticle friction coefficient (<i>µ</i><sub>micro</sub>) weakening on the dynamics of the “10.10” Baige landslide. We compared the impact of the CF law, one-state RF law, and two-state RF law on landslide dynamics under the same friction parameters. The results suggest that the weakening of <i>µ</i><sub>micro</sub> leads to a maximum increase of the sliding rate and displacement by 37.0% and 19.7%. Surprisingly, the two-state RF law exhibits the most robust coupling with the evolution stages of the landslide, which can be divided into initial creep, particle flow, and accumulation phases. Furthermore, the relationship between the apparent friction coefficient (<i>µ</i><sub>macro</sub>) and <i>µ</i><sub>micro</sub> was revealed as positively logarithmic, indicating that the weakening of <i>µ</i><sub>micro</sub> enhances the fluidity of the landslide. These findings are expected to improve the accuracy of landslide dynamic simulations further.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 10","pages":""},"PeriodicalIF":4.2000,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"The effect of interparticle friction weakening on landslide dynamics considering rate-dependent friction laws\",\"authors\":\"Yafeng Chen, Guoqing Chen, Qiang Xu, Hao Wen\",\"doi\":\"10.1007/s10064-025-04486-7\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Laboratory experiments have revealed that the friction coefficient within landslide shear bands exhibits rate dependence, which is the key factor in explaining the mechanism of high-speed and long-runout movement. However, the rate-dependent effect is overlooked due to the constant frictional value in the conventional Coulomb Friction (CF) law. To address this limitation, we propose using the relative shear rate between particles as an indicator, and integrating the Rate-dependent Friction (RF) law with the discrete element method to investigate the effects of interparticle friction coefficient (<i>µ</i><sub>micro</sub>) weakening on the dynamics of the “10.10” Baige landslide. We compared the impact of the CF law, one-state RF law, and two-state RF law on landslide dynamics under the same friction parameters. The results suggest that the weakening of <i>µ</i><sub>micro</sub> leads to a maximum increase of the sliding rate and displacement by 37.0% and 19.7%. Surprisingly, the two-state RF law exhibits the most robust coupling with the evolution stages of the landslide, which can be divided into initial creep, particle flow, and accumulation phases. Furthermore, the relationship between the apparent friction coefficient (<i>µ</i><sub>macro</sub>) and <i>µ</i><sub>micro</sub> was revealed as positively logarithmic, indicating that the weakening of <i>µ</i><sub>micro</sub> enhances the fluidity of the landslide. These findings are expected to improve the accuracy of landslide dynamic simulations further.</p></div>\",\"PeriodicalId\":500,\"journal\":{\"name\":\"Bulletin of Engineering Geology and the Environment\",\"volume\":\"84 10\",\"pages\":\"\"},\"PeriodicalIF\":4.2000,\"publicationDate\":\"2025-09-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Bulletin of Engineering Geology and the Environment\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://link.springer.com/article/10.1007/s10064-025-04486-7\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"ENGINEERING, ENVIRONMENTAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of Engineering Geology and the Environment","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10064-025-04486-7","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
The effect of interparticle friction weakening on landslide dynamics considering rate-dependent friction laws
Laboratory experiments have revealed that the friction coefficient within landslide shear bands exhibits rate dependence, which is the key factor in explaining the mechanism of high-speed and long-runout movement. However, the rate-dependent effect is overlooked due to the constant frictional value in the conventional Coulomb Friction (CF) law. To address this limitation, we propose using the relative shear rate between particles as an indicator, and integrating the Rate-dependent Friction (RF) law with the discrete element method to investigate the effects of interparticle friction coefficient (µmicro) weakening on the dynamics of the “10.10” Baige landslide. We compared the impact of the CF law, one-state RF law, and two-state RF law on landslide dynamics under the same friction parameters. The results suggest that the weakening of µmicro leads to a maximum increase of the sliding rate and displacement by 37.0% and 19.7%. Surprisingly, the two-state RF law exhibits the most robust coupling with the evolution stages of the landslide, which can be divided into initial creep, particle flow, and accumulation phases. Furthermore, the relationship between the apparent friction coefficient (µmacro) and µmicro was revealed as positively logarithmic, indicating that the weakening of µmicro enhances the fluidity of the landslide. These findings are expected to improve the accuracy of landslide dynamic simulations further.
期刊介绍：
Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces:
• the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations;
• the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change;
• the assessment of the mechanical and hydrological behaviour of soil and rock masses;
• the prediction of changes to the above properties with time;
• the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.
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