湖南大学学报（自然科学版）2024，Vol.51Issue(3)：81-91,11.DOI:10.16339/j.cnki.hdxbzkb.2024030
基于失稳模量理论的降雨条件下非饱和边坡流滑与滑移失稳机理研究
Study on Mechanism of Flowslides and Slip Instability of Unsaturated Slopes under Rainfall Conditions Based on Instability Modulus Theory
摘要
Abstract
Based on the classic plasticity theory,the criterion of seepage stability of unsaturated soil is established by the concept of instability modulus(HIN).Aiming at the post-failure mode of unsaturated soil slopes(i.e.limited frictional slips and rapid flow slides),by introducing the elastoplastic suction-dependent constitutive model,the expression of HIN identifying different failure modes of the slope is given.Taking the loose volcanic ash soil with potential liquefaction ability for example,the calibration procedure of theoretical model parameters is introduced.On this basis,the failure mode and its corresponding instability water content of volcanic ash slopes were predicted,thus validating the correctness and rationality of the theoretical model from flume tests.It is worth mentioning that based on the infinite slope model and the theory of instability modulus,the expression of the safety factor of the slope under different instability modes could be derived.Lastly,through parameter analysis,the influence of model parameters on the failure mode of the slope under different boundary conditions is investigated.This study can further clarify the inherent mechanism of different failure modes of unsaturated soil slopes under rainfall conditions,as well as provide theoretical guidance for the evaluation and design of seepage slope stability.关键词
非饱和土边坡/失稳模式/弹塑性本构模型/失稳模量/水槽试验/安全系数Key words
unsaturated soil slope/failure pattern/elastoplastic constitutive model/instability modulus/flume test/safety factor分类
建筑与水利引用本文复制引用
冯学茂,刘敏,宋祉辰,赵炼恒,林宇亮..基于失稳模量理论的降雨条件下非饱和边坡流滑与滑移失稳机理研究[J].湖南大学学报（自然科学版）,2024,51(3):81-91,11.基金项目
国家自然科学基金资助项目(51978666),National Natural Science Foundation of China(51978666) （51978666）
湖南省杰出青年科学基金资助项目(2021JJ10063),The Hunan Province Science Fund for Distinguished Young Scholars(2021JJ10063) （2021JJ10063）
贵州省科学技术厅科技支撑计划重点项目([2018]2815),Guizhou Provincial Science and Technology Department Foundation([2018]2815) （[2018]2815）
贵州省交通运输厅科技项目(2018-123-040),Guizhou Provincial Department of Transportation Foundation(2018-123-040) （2018-123-040）
