三峡库区白家包滑坡变形机理及稳定性分析预测
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摘要
滑坡是三峡库区危害性最大的地质灾害,而水库型滑坡在三峡库区占极大比重,约60%的水库型滑坡发生在库水骤降期,40%发生在水位上升期。以三峡库区白家包滑坡为例,结合多年的专业监测数据,对阶跃型变形退水滞后型滑坡诱发机制进行分析,运用Geo—Studio进行稳定性模拟分析预测。结果表明,退水滞后型滑坡因其坡体渗透性差,库水快速消落时,由于正落差的存在形成了指向坡体外侧的渗透力,不利于坡体稳定,易诱使滑坡失稳;库水消落速率越大,则滑坡的稳定性越差,当以较大消落速率工况2、3、4运行时,白家包滑坡处于欠稳定-不稳定状态。
Landslide is one of the most harmful geological hazards in Three Gorges Reservoir area,and the wading type reservoir bank landslides occupy a great proportion in the three gorges reservoir area.About 60% of the wading type reservoir bank landslides occur in water dropping period and 40% occur in water level rise duration. This paper takes Baijiabao landslide in Three Gorges Reservoir area as an example,combined with years of professional monitoring data,to analyze the induced mechanism of stepwise deformation and lag behind drawdown landslide. Using Geo-Studio simulates and analyses the stability prediction. The results showed that the lag behind drawdown landslide with poor permeability destabilized more easily when reservoir water regressed rapidly that accompanies with Seepage Force that is contrast to the slope direction that is not conducive to the landslide stability; Increasing dailydecreasing range,the stability of lag behind drawdown landslide decrease,the Baijiabao landslide will be in unstable state when it is in working condition 2,3,and 4.
Landslide is one of the most harmful geological hazards in Three Gorges Reservoir area,and the wading type reservoir bank landslides occupy a great proportion in the three gorges reservoir area.About 60% of the wading type reservoir bank landslides occur in water dropping period and 40% occur in water level rise duration. This paper takes Baijiabao landslide in Three Gorges Reservoir area as an example,combined with years of professional monitoring data,to analyze the induced mechanism of stepwise deformation and lag behind drawdown landslide. Using Geo-Studio simulates and analyses the stability prediction. The results showed that the lag behind drawdown landslide with poor permeability destabilized more easily when reservoir water regressed rapidly that accompanies with Seepage Force that is contrast to the slope direction that is not conducive to the landslide stability; Increasing dailydecreasing range,the stability of lag behind drawdown landslide decrease,the Baijiabao landslide will be in unstable state when it is in working condition 2,3,and 4.
引文
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[11]卢书强,张国栋,易庆林,等.三峡库区白家包阶跃型滑坡动态变形特征与机理[J].南水北调与水利科技,2016,14(3):147-152.
[12]殷坤龙,汪洋.三峡水库水水位日降幅对库区地质灾害防治工程影响的调查评价研究工作技术要求[R].宜昌:三峡库区地质灾害防治工作指挥部,2014.
[2]闫国强,易武,邓永煌.三峡库区某退水型滑坡饱和~非饱和渗流机理分析[J].水力发电,2016,42(7):31-35.
[3]邓建辉,马水山,张保军,等.清江隔河岩水库茅坪滑坡复活机理初探[J].岩石力学与工程学报,2003,22(10):1730-1737.
[4]李晓,张年学,廖秋林,等.库水水位涨落与降雨联合作用下滑坡地下水动力场分析[J].岩石力学与工程学报,2004,24(2):3714-3720.
[5]范庆来,刘远财.库水位涨落与降雨联合作用下绿草码头滑坡渗流场分布规律及稳定性分析[J].水电能源科学,2015,33(1):102,115-118.
[6]殷跃平.三峡库区地下水渗透压力对滑坡稳定性影响研究[J].中国地质灾害与防治学报,2003,14(3):1-8.
[7]廖红建,盛谦,高石夯,等.库水水位下降对滑坡体稳定性的影响[J].岩石力学与工程学报,2005,24(19):3454-3458.
[8]杨金,简文星,杨虎锋,等.三峡库区黄土坡滑坡浸润线动态变化规律研究[J].岩土力学,2012,33(3):853-858.
[9]易武,孟召平,易庆林.三峡库区滑坡预测预报理论与方法[M].北京:科学出版社,2011.
[10]谢守益,徐卫亚.降雨诱发滑坡机制研究[J].武汉水利水电大学学报,2000,32(1):56-60.
[11]卢书强,张国栋,易庆林,等.三峡库区白家包阶跃型滑坡动态变形特征与机理[J].南水北调与水利科技,2016,14(3):147-152.
[12]殷坤龙,汪洋.三峡水库水水位日降幅对库区地质灾害防治工程影响的调查评价研究工作技术要求[R].宜昌:三峡库区地质灾害防治工作指挥部,2014.