库水位变动下庄屋滑坡变形与稳定性分析
|
摘要
库水位变动是三峡库区滑坡等地质灾害频发的重要原因之一。为研究库水位变动对库岸涉水滑坡变形和稳定性的影响,以庄屋滑坡为例,结合GPS位移监测数据和数值模拟分析,探讨了该滑坡在库水升降过程中变形和稳定性的响应规律。结果表明,庄屋滑坡受库水影响滑坡后缘变形大于前缘,为推移式滑坡。水位变动过程中,滑坡渗流和稳定性变化具有动水压力型滑坡特点,即在水位上升时滑体内地下水浸润线呈内凹趋势,水位下降时滑体内地下水浸润线呈外凸趋势,且具有一定的滞后性;库水位上升时滑坡稳定性系数增大,水位下降时减小;当库水位保持在恒定水位时,稳定性系数也逐渐趋于稳定。
One of the important factors that lead to frequent landslides in the Three Gorges Reservoir area is the change of reservoir water level.In order to study the influence of reservoir water level variation on wading landslide stability,Zhuangwu landslide was taken as an example.Combined with the GPS displacement monitoring data and numerical simulation analysis,the response law of the deformation and stability of the landslide in the process of reservoir water lifting was studied.The results show that the Zhuangwu landslide is a lapse type landslide,and the deformation of the back edge of the landslide was greater than the front edge affected by the reservoir water.Under the condition of water level variation,the landslide has the characteristics of dynamic water pressure type.As water level risen,the groundwater saturation line of Zhuangwu landslide showed concave trend.When the water level dropped,groundwater saturation line showed convex trend,and the trend has a certain lag.The stability coefficient of landslide increased with the increase of water level,and decreased with the drawdown of reservoir water,and water level was keeping constant,the stability coefficient was gradually stable.
One of the important factors that lead to frequent landslides in the Three Gorges Reservoir area is the change of reservoir water level.In order to study the influence of reservoir water level variation on wading landslide stability,Zhuangwu landslide was taken as an example.Combined with the GPS displacement monitoring data and numerical simulation analysis,the response law of the deformation and stability of the landslide in the process of reservoir water lifting was studied.The results show that the Zhuangwu landslide is a lapse type landslide,and the deformation of the back edge of the landslide was greater than the front edge affected by the reservoir water.Under the condition of water level variation,the landslide has the characteristics of dynamic water pressure type.As water level risen,the groundwater saturation line of Zhuangwu landslide showed concave trend.When the water level dropped,groundwater saturation line showed convex trend,and the trend has a certain lag.The stability coefficient of landslide increased with the increase of water level,and decreased with the drawdown of reservoir water,and water level was keeping constant,the stability coefficient was gradually stable.
引文
[1]刘传正.长江三峡库区地质灾害成因与评价研究[M].北京:地质出版社,2007.
[2]庞茂康,任光明,李冬芹,等.某滑坡滑带土强度参数的敏感性分析[J].水电能源科学,2010,28(10):47-50.
[3]缪海波.三峡库区侏罗系红层滑坡变形破坏机理与预测预报研究[D].武汉:中国地质大学,2012.
[4]杨何,汤明高,蔡国军,等.三峡库区二道河滑坡变形机制研究[J].科学技术与工程,2016,16(8):66-71.
[5]汤罗圣.三峡库区堆积层滑坡稳定性与预测预报研究[D].武汉:中国地质大学,2013.
[2]庞茂康,任光明,李冬芹,等.某滑坡滑带土强度参数的敏感性分析[J].水电能源科学,2010,28(10):47-50.
[3]缪海波.三峡库区侏罗系红层滑坡变形破坏机理与预测预报研究[D].武汉:中国地质大学,2012.
[4]杨何,汤明高,蔡国军,等.三峡库区二道河滑坡变形机制研究[J].科学技术与工程,2016,16(8):66-71.
[5]汤罗圣.三峡库区堆积层滑坡稳定性与预测预报研究[D].武汉:中国地质大学,2013.