唐古栋滑坡变形破坏机制及岸坡稳定性研究
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摘要
结合坡体结构分析及有限差分计算,研究了唐古栋滑坡在历史上河谷下切过程中边坡应力、应变发展规律,得出了前缘缓倾坡外结构面发育类高边坡变形破坏机制可归纳为"卸荷拉裂—滑移(压致)拉裂—剪断"3段式机制的结论。基于变形破坏机制研究及数值模拟计算,分析出唐古栋滑坡上游侧变形体在楞古水电站下坝段蓄水、地震工况共同作用下,锁固段岩体内应力集中明显、塑性破坏严重,可能导致边坡整体高速失稳。
According to slope structure analysis and simulation using finite difference method,changes of stress and strain in the Tanggudong slope during the down-cutting of Yalong River valley in the history were studied.The deformation mechanism of slope with structural planes dipping outside in the slope foreside can be summarized into three stages(unloading tension crack,sliding tension pressed crack,and tension pressed-shearing).According to the mechanism analysis and simulation,the locked section of rock mass in the upstream residual deformation slope will show strong stress concentration and severe plastic failure under the impounding of downstream dam site of Lenggu hydropower project and earthquake condition.That can lead to high-speed landslide of the whole slope.
According to slope structure analysis and simulation using finite difference method,changes of stress and strain in the Tanggudong slope during the down-cutting of Yalong River valley in the history were studied.The deformation mechanism of slope with structural planes dipping outside in the slope foreside can be summarized into three stages(unloading tension crack,sliding tension pressed crack,and tension pressed-shearing).According to the mechanism analysis and simulation,the locked section of rock mass in the upstream residual deformation slope will show strong stress concentration and severe plastic failure under the impounding of downstream dam site of Lenggu hydropower project and earthquake condition.That can lead to high-speed landslide of the whole slope.
引文
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[5]沈军辉,王兰生,王青海,等.卸荷岩体的变形破裂特征[J].岩石力学与工程学报,2003,22(12):2028-2031.(SHEN Jun-hui,WANG Lang-sheng,WANG Qing-hai,et al.Deformation and Fracture Features of Unloaded Rock Mass[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(12):2028-2031.(in Chinese))
[2]冷伦,冷荣梅.雅砻江垮山洪水和历史的教训[J].四川水利,2002,(2):42!44.(LENG Lun,LENG Rong-mei.Kuashan Stride Flood and Its Historical Lesson in Yalongjiang River[J].Sichuan Water Conservancy,2002,(2):42!44.(in Chinese))
[3]徐佩华,陈剑平,黄润秋,等.雅砻江河谷下切三维数值模拟分析——解放沟模型应力场分析[J].吉林大学学报(地球科学版),2003,33(2):208-212.(XU Pei-hua,CHEN Jian-ping,HUANG Run-qiu,et al.3-D Numerical Simulation Analysis of Yalongjiang Valley Stress Field Analysis of Jiefanggou Model[J].Journal of Jilin University(Earth Science Edition),2003,33(2):208-212.(in Chinese))
[4]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):433-454.(HUANG Run-qiu.Large-scale Landslides and Their Sliding Mechanisms in China Since the 20th Century[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(3):433-454.(in Chinese))
[5]沈军辉,王兰生,王青海,等.卸荷岩体的变形破裂特征[J].岩石力学与工程学报,2003,22(12):2028-2031.(SHEN Jun-hui,WANG Lang-sheng,WANG Qing-hai,et al.Deformation and Fracture Features of Unloaded Rock Mass[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(12):2028-2031.(in Chinese))
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