紫鹊界梯田失稳机制  

Destabilization Mechanism of Ziquejie Terrace

作　　者：欧阳琦 陈欣 危润初[1,2,3] 伍诗梦 朱志远 Ouyang Qi;Chen Xin;Wei Runchu;Wu Shimeng;Zhu Zhiyuan(School of Hydraulic and Environmental Engineering,Changsha University of Science&Technology,Changsha 410004,China;Hunan Provincial Key Laboratory of Water and Sediment Science and Water Disaster Prevention and Control,Changsha University of Science&Technology,Changsha 410004,China;Hunan Provincial Key Laboratory of Water Environment Treatment and Ecological Restoration of Dongting Lake,Changsha University of Science&Technology,Changsha 410004,China;Hunan Hengyang Hydrology and Water Resources Survey Center,Hengyang 421001,Hunan,China;Hunan Loudi Hydrology and Water Resources Survey Center,Loudi 417000,Hunan,China)

机构地区：[1]长沙理工大学水利与环境工程学院,长沙410004 [2]长沙理工大学水沙科学与水灾害防治湖南省重点实验室,长沙410004 [3]长沙理工大学洞庭湖水环境治理与生态修复湖南省重点实验室,长沙410004 [4]湖南衡阳水文水资源勘测中心,湖南衡阳421001 [5]湖南娄底水文水资源勘测中心,湖南娄底417000

出　　处：《吉林大学学报（地球科学版）》2024年第2期581-591,共11页Journal of Jilin University：Earth Science Edition

基　　金：湖南省教育厅优秀青年项目(21 B0314);国家自然科学基金项目(41602264);湖南省自然科学基金项目(2020JJ5572,2023JJ400021);长沙理工大学“双一流”科学研究国际合作拓展项目(2019IC08)。

摘　　要：为厘清降雨入渗作用对花岗岩区梯田边坡稳定性的影响,本文以湖南省紫鹊界梯田为例,在分析紫鹊界梯田地质条件的基础上,基于有限元数值模拟软件Geostudio多模块的耦合,分析了不同边坡坡度和不同土层厚度在暴雨条件下的渗流场和稳定性。研究结果表明:在降雨强度为90 mm/d、降雨历时为5 d的工况下,坡度为35°和40°的边坡处于失稳状态,稳定性系数与边坡坡度负相关;全风化土层越厚的边坡稳定性系数越低;在降雨历时5 d后,不同土层工况下的稳定性系数相差不大,但无降雨时,全风化土层越薄的边坡明显更加稳定。In order to discuss the influence of rainfall infiltration on the stability of granite terrace slope,this paper takes the Ziquejie terrace in Hunan Province as an example.Based on the analysis of the geological conditions of Ziquejie terrace,the seepage field and stability of different slope gradients and different soil layer thicknesses under rainstorm conditions were analyzed based on the coupling of multiple modules of the finite element numerical simulation software Geostudio.The results show that under the working condition of 90 mm/d rainfall intensity and 5 days rainfall duration,the slopes with 35°and 40°gradients are in a state of destabilization,and the stability coefficient is negatively correlated with the increase of slope gradient;The thicker the fully weathered soil layer is,the lower the safety factor of the slope is.After 5 days of rainfall,the stability coefficients of different soil layers under different working conditions are similar.However,when there is no rainfall,the thinner the fully weathered soil layer is,the more stable the slope is.

关 键 词：紫鹊界梯田 花岗岩 降雨入渗 边坡稳定性 坡度 土层厚度 

分 类 号：P642.2[天文地球—工程地质学]