三峡库区万州金金子滑坡动态变形规律分析
|
摘要
万州区金金子滑坡是三峡水库右岸涉水覆盖层滑坡,在降雨、人工活动等诱发因素影响下,局部发生了较大的变形破坏。该滑坡于1996年发现变形迹象,2003年库区大坝蓄水后仍存在变形,滑坡近20 a来变形持续,2016年滑坡体局部发生了变形破坏。在深入分析滑坡变形特征基础之上,充分利用现场监测数据,从地质因素和环境因素两方面对滑坡成因及变形破坏规律展开研究。通过地质调查发现,斜坡区大量松散崩坡积物堆积于下伏近水平粉砂泥岩上,斜坡形态呈阶梯状,其上冲沟发育,大片覆盖人工种植苗木。滑坡监测数据显示,位移变形曲线存在突变,突变后趋于平缓,在突变前期研究区内有明显的降雨过程。分析认为:滑坡整体仍存在持续变形,局部区域变形失稳后趋于平缓;阶梯状斜坡上覆的松散堆积体和下伏的软弱地层为滑坡变形的地质基础;降雨以及人类工程活动则为该滑坡的主要诱发因素。
The Jinjinzi landslide in Wanzhou district,Chongqing City, is a water-related landslide of loose cover layer on the right bank of the Three Gorges Reservoir. Under the influence of inducing factors such as rainfall and artificial activities, relatively large landslide deformation and failure occurred locally. The sliding evidence appeared in 1996 and the deformation is still developing after impoundment of Three Gorges Reservoir in 2003 and lasts for nearly two decades, and local failure of the landslide occurred in 2016. Based on the in-depth analysis of landslide deformation characteristics, this paper makes full use of field monitoring data to study landslide genesis and deformation failure law from the aspects of geological factors and environmental factors. Geological investigation discovered that a large amount of loose landslide material deposited on the underlying near-horizontal silty mudstone in the slope area, and the landslide slope was in a step-shape, and scouring gully developed fully on the slope face that was covered by artificial plants. The landslide monitoring data showed that the deformation curve of displacement had a mutation after a significant rainfall process in the study area and then tended to be flat. According to the analysis, in general, the landslide is still in continuous deformation, and the local area deformation tends to be gentle after and stability loosing. Loose accumulation bodies and underlying soft strata on the slope are the geological foundation of landslide deformation and rainfall and human engineering activities are the main causes of landslide.
The Jinjinzi landslide in Wanzhou district,Chongqing City, is a water-related landslide of loose cover layer on the right bank of the Three Gorges Reservoir. Under the influence of inducing factors such as rainfall and artificial activities, relatively large landslide deformation and failure occurred locally. The sliding evidence appeared in 1996 and the deformation is still developing after impoundment of Three Gorges Reservoir in 2003 and lasts for nearly two decades, and local failure of the landslide occurred in 2016. Based on the in-depth analysis of landslide deformation characteristics, this paper makes full use of field monitoring data to study landslide genesis and deformation failure law from the aspects of geological factors and environmental factors. Geological investigation discovered that a large amount of loose landslide material deposited on the underlying near-horizontal silty mudstone in the slope area, and the landslide slope was in a step-shape, and scouring gully developed fully on the slope face that was covered by artificial plants. The landslide monitoring data showed that the deformation curve of displacement had a mutation after a significant rainfall process in the study area and then tended to be flat. According to the analysis, in general, the landslide is still in continuous deformation, and the local area deformation tends to be gentle after and stability loosing. Loose accumulation bodies and underlying soft strata on the slope are the geological foundation of landslide deformation and rainfall and human engineering activities are the main causes of landslide.
引文
[1] 成国文,李善涛,李晓,等.万州近水平地层区堆积层滑坡成因与变形破坏特征[J].工程地质学报,2008(3):17-23.
[2] 简文星,殷坤龙,郑磊,等.万州安乐寺滑坡前缘松散堆积体成因与防治对策[J].地球科学,2005(4):487-492,502.
[3] 简文星,殷坤龙,汪洋,等.万州西溪铺松散堆积体成因分析及稳定性评价[J].地质科技情报,2005(S1):165-169.
[4] 唐志政,汪洋,吴晔.库水位波动条件下万州瓦窑坪滑坡稳定性分析[J].水文地质工程地质,2015,42(1):129-133.
[5] 廖秋林,李晓.三峡库区千将坪滑坡的发生、地质地貌特征、成因及滑坡判据研究[J].岩石力学与工程学报,2005,24(17):3146-3153.
[6] 王志俭,殷坤龙,简文星,等.三峡库区万州红层砂岩流变特性试验研究[J].岩石力学与工程学报,2008(4):840-847.
[7] 杨宗佶,乔建平,陈晓林,等.三峡库区万州侏罗系红层滑坡成因机制研究[J].世界科技研究与发展,2008(2):174-176.
[8] 简文星,殷坤龙,马昌前,等.万州侏罗纪红层软弱夹层特征[J].岩土力学,2005(6):901-905,914.
[9] 简文星,殷坤龙,罗冲,等.三峡库区万州安乐寺滑坡滑带特征[J].地球科学,2008(5):672-678.
[10] 简文星,殷坤龙,闫天俊,等.重庆万州区民国场滑坡基本特征及形成机制[J].中国地质灾害与防治学报,2005(4):24-27.
[11] 田正国,卢书强.三峡库区泥儿湾滑坡成因机制分析及稳定性评价[J].资源环境与工程,2012,26(3):236-239.
[12] 卢书强,易庆林,易武,等.三峡库区卧沙溪滑坡变形失稳机制分析[J].中国地质灾害与防治学报,2013,24(2):21-25.
[13] 卢书强,易庆林.三峡库区树坪滑坡变形失稳机制分析[J].岩土力学,2014(4):1123-1130.
[14] 郑志勇.顺层边坡的稳定性影响因素及失稳判据分析[J].人民长江,2016,47(21):57-61.
[15] 许强.滑坡的变形破行为与内在机理[J].工程地质学报,2012(2):145-151.
[16] 丁秀丽,付敬,张奇华.三峡水库涨落条件下奉节南桥头滑坡稳定性分析[J].岩石力学与工程学报,2004,23(17):2913-2919.
[17] 鲁芃,王世梅,郭振,等.库水位日降幅对白家包滑坡稳定性影响分析[J].人民长江,2017,48(9):50-53.
[18] 陈亮青,邹宗兴,范谊,等.考虑诱发因素影响滞后性的库岸滑坡位移预测[J].人民长江,2018,49(10):60-64.
[2] 简文星,殷坤龙,郑磊,等.万州安乐寺滑坡前缘松散堆积体成因与防治对策[J].地球科学,2005(4):487-492,502.
[3] 简文星,殷坤龙,汪洋,等.万州西溪铺松散堆积体成因分析及稳定性评价[J].地质科技情报,2005(S1):165-169.
[4] 唐志政,汪洋,吴晔.库水位波动条件下万州瓦窑坪滑坡稳定性分析[J].水文地质工程地质,2015,42(1):129-133.
[5] 廖秋林,李晓.三峡库区千将坪滑坡的发生、地质地貌特征、成因及滑坡判据研究[J].岩石力学与工程学报,2005,24(17):3146-3153.
[6] 王志俭,殷坤龙,简文星,等.三峡库区万州红层砂岩流变特性试验研究[J].岩石力学与工程学报,2008(4):840-847.
[7] 杨宗佶,乔建平,陈晓林,等.三峡库区万州侏罗系红层滑坡成因机制研究[J].世界科技研究与发展,2008(2):174-176.
[8] 简文星,殷坤龙,马昌前,等.万州侏罗纪红层软弱夹层特征[J].岩土力学,2005(6):901-905,914.
[9] 简文星,殷坤龙,罗冲,等.三峡库区万州安乐寺滑坡滑带特征[J].地球科学,2008(5):672-678.
[10] 简文星,殷坤龙,闫天俊,等.重庆万州区民国场滑坡基本特征及形成机制[J].中国地质灾害与防治学报,2005(4):24-27.
[11] 田正国,卢书强.三峡库区泥儿湾滑坡成因机制分析及稳定性评价[J].资源环境与工程,2012,26(3):236-239.
[12] 卢书强,易庆林,易武,等.三峡库区卧沙溪滑坡变形失稳机制分析[J].中国地质灾害与防治学报,2013,24(2):21-25.
[13] 卢书强,易庆林.三峡库区树坪滑坡变形失稳机制分析[J].岩土力学,2014(4):1123-1130.
[14] 郑志勇.顺层边坡的稳定性影响因素及失稳判据分析[J].人民长江,2016,47(21):57-61.
[15] 许强.滑坡的变形破行为与内在机理[J].工程地质学报,2012(2):145-151.
[16] 丁秀丽,付敬,张奇华.三峡水库涨落条件下奉节南桥头滑坡稳定性分析[J].岩石力学与工程学报,2004,23(17):2913-2919.
[17] 鲁芃,王世梅,郭振,等.库水位日降幅对白家包滑坡稳定性影响分析[J].人民长江,2017,48(9):50-53.
[18] 陈亮青,邹宗兴,范谊,等.考虑诱发因素影响滞后性的库岸滑坡位移预测[J].人民长江,2018,49(10):60-64.