大渡河章古滑坡演化机制分析及稳定性评价
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摘要
章古滑坡位于大渡河右岸,姑咱镇下游2.5km,体积约19 000×104 m3,属特大型滑坡,且该区属高烈度区,滑体一旦失稳,可能造成堵河和堰塞溃坝。为了分析滑坡的演化过程及发展趋势,通过野外调研、测绘、物探及室内测年等研究方法,并利用三维有限元软件(FLAC-3D)进行数值模拟分析,对滑坡的演化机制和滑坡体的稳定性进行了研究。结果表明:章古滑坡为古地震滑坡,滑坡体的形成经历了河谷卸荷松弛、大渡河侧蚀、强震滑坡和翻坝侵蚀四个阶段;目前,滑坡体整体处于稳定状态,但局部范围可能发生次级滑坡。
The Zhanggu Landslide lies at the right bank of the Daduhe River and 2.5 km downstream of Guza Town,which is a super large-scale landslide with a volume of 19 000×104 m3.This area belongs to the highly seismic region.Once the landslide is damaged,it can result in river blocking and dam break.In order to analyze the evolution process and develop trend of the landslide,the field investigation,geological mapping,geophysical prospecting,and laboratory dating methods were used to investigate the formation-evolution mechanism and stability of the Zhanggu Landslide based on the numerical simulation using the three-dimensional finite element software(FLAC-3D).The results showed that the Zhanggu Landslide is a palaeo-earthquakr landslide and its formation includes four stages:unloading and relaxation of the Daduhe River,lateral erosion of the Daduhe River,slope failure triggered by a strong earthquake,and river dam erosion.At present,the landslide is in stable condition but a secondary landslide may occur on the local scale.
The Zhanggu Landslide lies at the right bank of the Daduhe River and 2.5 km downstream of Guza Town,which is a super large-scale landslide with a volume of 19 000×104 m3.This area belongs to the highly seismic region.Once the landslide is damaged,it can result in river blocking and dam break.In order to analyze the evolution process and develop trend of the landslide,the field investigation,geological mapping,geophysical prospecting,and laboratory dating methods were used to investigate the formation-evolution mechanism and stability of the Zhanggu Landslide based on the numerical simulation using the three-dimensional finite element software(FLAC-3D).The results showed that the Zhanggu Landslide is a palaeo-earthquakr landslide and its formation includes four stages:unloading and relaxation of the Daduhe River,lateral erosion of the Daduhe River,slope failure triggered by a strong earthquake,and river dam erosion.At present,the landslide is in stable condition but a secondary landslide may occur on the local scale.
引文
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[3]徐飞飞.大渡河黄金坪水电站后山高陡岩质边坡稳定性分析[J].路基工程,2011(4):182-184.(XU Fei-fei.Stability Analy-sis of High Steep Rock Slope in Rear Mountain of HuangjinpingHydropower Station in Dadu River[J].Subgrade Engineering,2011(4):182-184.(in Chinese))
[4]熊发挥,肖渊甫,张林.大渡河中游泸定-石棉段阶地特征及河谷发育史探讨[J].四川地质学报,2009(4):379-383.(XIONGFa-hui,XIAO Yuan-fu,ZHANG Lin.An Approach to Develop-mental History of the Luding-Shimian Sector of the Dadu RiverValley[J].Acta Geologica Sichuan,2009(4):379-383.(in Chi-nese))
[5]王运生,李文纲,黄润太,等.大渡河谷底卸荷松弛现象及其形成机制[J].成都理工大学学报(自然科学版),2007(4):379-383.(WANG Yun-sheng,LI Wen-gang,HUANG Run-tai,etal.The Unloaded and Relaxed Phenomena in the Valley Bottomof the Daduhe River and Its Genetic Mechanism[J].Journal ofChengdu University of Science and Technology(Natural ScienceEdition),2007(4):379-383.(in Chinese))
[6]Sarma S K.Stability Analysis of Embankment Sand Slopes[J].Geotechnique,1979,105(12):1511-1524.
[7]王瑞江,吴树仁,胡道功,等.滑坡稳定性三维数值模拟分析[J].长春科技大学学报,1999(3):267-271,27.(WANG Rui-jiang,WU Shu-ren,HU Dao-gong,et al.Analysis on LandslideStability by Using Three Dimensional Numerical Simulation[J].Journal of Changchun University of Science and Technolo-gy,1999(3):267-271,27.(in Chinese))
[8]Jaehong K,Sangseom J,Seongwan P,et al.Influence of Rain-fall-induced Wetting on the Stability of Slopes in WeatheredSoils[J].Engineering Geology,2004,75:251-262.
[9]张利洁,黄正加,雷菁.FLAC-3D在边坡岩体稳定性分析中的应用[J].岩土力学,2005(S2):61-64.(ZHANG Li-jie,HUANG Zheng-jia,LEI Jing.Application of FLAC-3Dto Sta-bility Analysis of Slope Rock Mass[J].Rock and Soil Mechan-ics,2005(S2):61-64.(in Chinese))
[10]孙书勤,黄润秋,丁秀美.天台乡滑坡特征及稳定性的FLAC-(3D)分析[J].水土保持研究,2006(5):30-32.(SUN Shu-qin,HUANG Run-qiu,DING Xiu-mei.Tiantai Landslide and ItsStability Analysis with FlAC-3D[J].Research of Soil and Wa-ter Conservation,2006(5):30-32.(in Chinese))
[11]张雪东,陈剑平,黄润秋,等.呷爬滑坡稳定性的FLAC-3D数值模拟分析[J].岩土力学,2003(S1):113-116.(ZHANGXue-dong,CHEN Jian-ping,HUANG Run-qiu,et al.FLAC-3DNumerical Simulation Analysis of Stability of Gapa Land-slide[J].Rock and Soil Mechanics,2003(S1):113-116.(inChinese))
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