摘要
2022年3月17日,山西省交口县某铝矿尾矿库发生溃坝事故,造成较大经济损失。为了探究尾矿库溃坝的原因,基于多时相光学卫星立体像对数据和SBAS-InSAR等遥感技术,回溯分析该尾矿库的堆载过程、库容变化和坝体形变,并采用GeoStudio软件Slope/W模块评价溃坝前边坡的稳定性。结果表明:(1)该尾矿库于2019年9月前已堆积至最大库容,2021年12月前在2^(#)坝后方子库堆载至96万m^(3),超出设计库容4.8万m^(3),从而降低了坝体的稳定性;(2)溃坝物源主要来自2^(#)坝以上库区,在2^(#)坝与1^(#)坝之间以及1^(#)坝到沟口区域均主要以堆积为主;(3)该尾矿库溃坝属于典型的渗流场诱发尾矿坝失稳,尾矿加载导致其坝体边坡稳定性安全系数由1.125降至0.991,是该尾矿库溃坝的直接诱发因素。
A dam breach accident occurred in a tailings pond in Jiaokou County,Shanxi Province,on March 17,2022,which led to great economic losses.To investigate the reasons behind the dam breach,surcharge,dam deformation,and capacity change analyses were conducted retrospectively based on the stereo image pair data from multitemporal optical satellites and remote sensing techniques such as SBAS-InSAR.Additionally,the Slope/W module of GeoStudio software was employed to analyze the stability of the slope before the dam breach.It was revealed that(1)the capacity of the tailings pond reached its maximum value before September 2019,and it was surcharged to 960000 m^(3) before December 2021 in the subpond behind dam 2^(#),which exceeded the design capacity by 48000 m^(3),thus reducing the stability of the dam.(2)The source of material of the dam breach mainly derives from the area above dam 2^(#).The areas between dams 2^(#)and 1^(#),as well as from dam 1^(#)to the gully,mainly contain accumulated material.(3)Furthermore,the dam breach is a typical seepage field-induced instability of the tailings dam,and the safety factor of the slope stability is reduced from 1.125 to 0.991 due to tailings loading,which is the direct inducing factor of the dam breach of the tailings pond.
作者
周胜森
李为乐
陆会燕
单云锋
郁文龙
许善淼
张攀
李维敏
ZHOU Shengsen;LI Weile;LU Huiyan;SHAN Yunfeng;YU Wenlong;XU Shanmiao;ZHANG Pan;LI Weimin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,Sichuan,China)
出处
《地震工程学报》
CSCD
北大核心
2023年第5期1085-1095,共11页
China Earthquake Engineering Journal
基金
长江生态环境保护修复联合研究二期项目(2022-LHYJ-02-0201)
四川省科技计划项目(2023YFS0435)。
关键词
尾矿库
溃坝
多源遥感
堆载过程
失稳模式
tailings pond
dam breach
multisource remote sensing
surcharge process
failure mode
