金沙江乌东德库区必油照滑坡稳定性分析
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摘要
在详细分析金沙江水电站库岸滑坡地质结构和区域地质环境的基础上,结合地层产状、水文气象等因素,利用Ansys和Flac~(3D)建立必油照滑坡地质模型,利用强度折减法与有限差分程序进行多工况下的全过程动态数值模拟。计算坡体由初始化自重平衡作用到临界滑移失稳状态全过程的位移、速率变化趋势,分析滑坡破坏模式与滑移特征,并由剪切应变增量云图确定滑移面。通过数值模拟,阐释了滑坡破坏演化特征和失稳机理。坡体塑性变形与位移分析结果表明:滑坡在天然状态下基本稳定;在连续高强度降雨状态下欠稳定,局部失稳滑塌的可能性很大,这与现场调查分析的结果一致。利用Flac~(3D)进行滑坡稳定性分析和评价简单、可行,且更加直观、方便,具有传统极限平衡法所无法比拟的优势。
Based on the detailed analysis on geological structure and regional geological environment of landslide on the bank of reservoir on the Jinsha River,stratum occurrence,hydrometeorology and other factors,a geological model for Biyouzhao landslide was established by using ANSYS and Flac3 D. Then combined with strength reduction method and finite difference program,the displacement and displacement rate of the landslide in the full process from the initial deadweight balance to critical slipping instability under multiple working conditions were calculated and the failure mode and slipping characteristics of the landslide were analyzed,and the slipping plane was determined by the shear strain incremental cloud map. Through numerical simulation,the evolution characteristics and instability mechanism of landslide failure were explained. The results of plastic deformation and displacement analysis showed that the landslide was basically stable in natural state and unstable under the condition of continuous intensive rainfall,which was consistent with the results of field investigation and analysis. Using Flac3 D to analyze and evaluate the landslide stability is simple,feasible,and more intuitive and convenient than the conventional method.
Based on the detailed analysis on geological structure and regional geological environment of landslide on the bank of reservoir on the Jinsha River,stratum occurrence,hydrometeorology and other factors,a geological model for Biyouzhao landslide was established by using ANSYS and Flac3 D. Then combined with strength reduction method and finite difference program,the displacement and displacement rate of the landslide in the full process from the initial deadweight balance to critical slipping instability under multiple working conditions were calculated and the failure mode and slipping characteristics of the landslide were analyzed,and the slipping plane was determined by the shear strain incremental cloud map. Through numerical simulation,the evolution characteristics and instability mechanism of landslide failure were explained. The results of plastic deformation and displacement analysis showed that the landslide was basically stable in natural state and unstable under the condition of continuous intensive rainfall,which was consistent with the results of field investigation and analysis. Using Flac3 D to analyze and evaluate the landslide stability is simple,feasible,and more intuitive and convenient than the conventional method.
引文
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[19]王双,裴向军,张晓超,等.黄土滑坡地震液化数值模拟分析—以宁夏石碑塬滑坡为例[J].人民长江,2015,46(11):25-29.
[20]王忠福,刘汉东,何思明.阿海水电站进场公路K62滑坡动态变形监测及三维数值分析[J].岩土工程学报,2013,35(S2):94-100.
[21]杨金旺,陈媛,张林,等.基于地质力学模型试验综合法的顺层岩质高边坡稳定性研究[J].岩石力学与工程学报,2018,37(1):131-140.
[2]郑颖人,赵尚毅.边(滑)坡工程设计中安全系数的讨论[J].岩石力学与工程学报,2006,25(9):1937-1940.
[3]赵尚毅,郑颖人,时卫民,等.用有限元强度折减法求边坡稳定安全系数[J].岩土工程学报,2002,24(3):343-346.
[4]卢书强,易庆林,易武,等.三峡库区树坪滑坡变形失稳机制分析[J].岩土力学,2014,35(4):1123-1130.
[5]赵代鹏,王世梅,谈云志,等.库水升降作用下浮托减重型滑坡稳定性研究[J].岩土力学,2013,34(4):1017-1024.
[6]唐晓松,郑颖人,唐辉明.边坡变形破坏演化特征的数值分析[J].重庆大学学报,2013,36(10):101-113.
[7]陆治斌,蔡俊超,郑达.基于离散元的小坝滑坡演化机理研究[J].人民长江,2017,48(S2):116-119.
[8]周新,巨能攀,张潇敏.水平岩层软弱基座危岩体演化过程研究[J].人民长江,2015,46(22):40-44.
[9]苗朝,石胜伟,谢忠胜,等.红层缓倾岩质斜坡地下水作用机制及稳定性分析[J].人民长江,2016,47(18):50-55.
[10]张旭,谭卓英,周春梅.库水位变化下滑坡渗流机制与稳定性分析[J].岩石力学与工程学报,2016,35(4):713-723.
[11]李新卫,晏鄂川,李辉.暴雨作用下铜仁地区典型滑坡变形机理研究[J].人民长江,2016,47(7):44-49.
[12]王世梅,刘佳龙,王力,等.三峡水库库水位升降对谭家河滑坡影响分析[J].人民长江,2015,46(8):83-86.
[13]张永昌,钱辈贝,郭飞.三峡水库水位升降作用下树坪滑坡复活机理研究[J].人民长江,2015,46(17):57-62.
[14]闫云明,崔树军,刘见宝.强度折减法改进及在边坡稳定性评价中的应用[J].人民长江,2017,48(7):79-82.
[15]安海堂,余会明,张卫强.土质边坡开挖试验及其数值模拟研究[J].人民长江,2016,47(19):48-52.
[16]陈胜伟,刘先林,陈宇.岑水高速六活口滑坡稳定性分析与治理研究[J].人民长江,2016,47(2):27-31.
[17]张旭.基于能量的露天矿边坡灾变时空演化与多模型综合评价[D].北京:北京科技大学,2017.
[18]刘晓,唐辉明,胡新丽,等.金鼓高速远程滑坡形成机制及动力稳定性[J].岩石力学与工程学报,2012,31(12):2527-2537.
[19]王双,裴向军,张晓超,等.黄土滑坡地震液化数值模拟分析—以宁夏石碑塬滑坡为例[J].人民长江,2015,46(11):25-29.
[20]王忠福,刘汉东,何思明.阿海水电站进场公路K62滑坡动态变形监测及三维数值分析[J].岩土工程学报,2013,35(S2):94-100.
[21]杨金旺,陈媛,张林,等.基于地质力学模型试验综合法的顺层岩质高边坡稳定性研究[J].岩石力学与工程学报,2018,37(1):131-140.