摘要
降雨是诱发离子型稀土矿边坡失稳的关键因素之一,尤其是离子型稀土矿原地浸矿后修缮的边坡更易受降雨入渗影响。以华南地区某离子型稀土矿边坡为研究背景,基于土壤湿度监测数据与有限元模拟,系统分析了降雨量、持续时间和降雨类型对边坡稳定性的影响。研究表明,单峰型与多峰型降雨的深层入渗(>60 cm)事件占比(19.79%),显著高于集中型(1.04%)和均匀型(5.21%)。数值模拟显示,低雨量(10~20 mm/d)条件下边坡稳定性排序为集中型>均匀型>单峰型>多峰型;高雨量(50 mm/d)时单峰型稳定性最差。随着降雨持续时间的增加,集中型和均匀型降雨条件下边坡稳定性系数呈先缓慢下降后快速下降的趋势,单峰型和多峰型降雨条件下边坡稳定性系数呈先快速下降后缓慢下降的趋势,这与峰值降雨强度导致的基质吸力突变密切相关。研究结果可为离子型稀土矿降雨型滑坡防控提供理论依据。
Rainfall is a primary factor inducing landslides on slopes,especially the slope repaired after in-situ leaching of ionic rare earth mine is more susceptible to rainfall infiltration.Taking the slope of an ionic rare earth mine in South China as the research background,the influences of rainfall,duration and rainfall type on slope stability was systematically analyzed based on the monitoring data of soil moisture and finite element simulation.The results show that the proportion of deep infiltration(deeper than 60 cm)events(accounting for 19.79%)of single-peak and multi-peak rainfall is significantly higher than that of concentrated(accounting for 1.04%)and uniform(accounting for 5.21%).The numerical simulation shows that the slope stability under the condition of low rainfall(10-20 mm/d)is concentrated>uniform>single peak>multi peak.The stability of single peak type is the worst when the rainfall is high(50 mm/d).With the increase of rainfall duration,the slope stability coefficient under concentrated and uniform rainfall conditions shows a trend of slow decline and then rapid decline,and the slope stability coefficient under single-peak and multi-peak rainfall conditions shows a trend of rapid decline and then slow decline,which is closely related to the sudden change of matrix suction caused by peak rainfall intensity.The research can provide a theoretical basis for the prevention and control of rainfall-induced landslides in ionic rare earth mines.
作者
方棱
薛少琪
李俊杰
FANG Leng;XUE Shaoqi;LI Junjie(Zhejiang Urban Construction Survey and Research Institute Co.,Ltd.,Hangzhou,Zhejiang 310002,China;Shandong Survey and Design Institute of Water Conservancy Co.,Ltd.,Jinan,Shandong 250014,China;Zhejiang Design Institute of Water Conservancy and Hydroelectric Power Co.,Ltd.,Hangzhou,Zhejiang 310002,China)
出处
《矿业研究与开发》
北大核心
2025年第6期146-153,共8页
Mining Research and Development
基金
浙江省自然科学基金项目(LGF18E090004)。
关键词
离子型稀土矿
降雨入渗
降雨类型
边坡稳定性
有限元模拟
lonic rare earth mine
Rainfall infiltration
Rainfall type
Slope stability
Finite-element modeling
作者简介
方棱(1971-),男,浙江浦江人,高级工程师,主要从事岩土工程技术研究。E-mail:1047975381@qq.com;通信作者:李俊杰(1989-),男,江西上饶人,硕士,高级工程师,主要从事水文工程地质及工程监测研究。E-mail:lijunjiecsu@163.com。
