新疆则克台堰塞湖稳定性分析
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摘要
则克台堰塞湖是加郎普特滑坡地质灾害发生后形成的,严重威胁着下游则克台镇人民的生命财产安全。在分析堰塞湖的地质环境条件和成因机制的基础上,从渗透稳定性、抗冲刷稳定性和抗滑稳定性三个方面对其进行稳定性分析。结果表明:堰塞体目前处于相对稳定状态,发生整体失稳和管涌潜蚀失稳的可能性很小。在地震工况时,下游坝坡发生局部塌滑的可能性较大,但不影响坝体整体稳定,坝体可能的失稳方式为漫顶冲刷破坏。
Zeketai Landslide Dam is formed by the geological disaster caused by Jialangpute Landslide,which threatens the safety of the people's lives and property of the downstream town——Zeketai. Based on the analysis of the geo-environment condition and the genetic mechanism of the landslide dam,its stability is analyzed from three aspects such as seepage stability,anti-scour stability and anti-slide stability. The result shows that the body of the landslide dam is relatively stable with less possibility of overall unstability and subsurface erosion from piping. However,the possibility that the local collapse occurs at the downstream slope is larger,which can,nevertheless,not impact the overall stability of the dam. Therefore,the unstable mode to possibly occur is the damage from overtopping erosion.
Zeketai Landslide Dam is formed by the geological disaster caused by Jialangpute Landslide,which threatens the safety of the people's lives and property of the downstream town——Zeketai. Based on the analysis of the geo-environment condition and the genetic mechanism of the landslide dam,its stability is analyzed from three aspects such as seepage stability,anti-scour stability and anti-slide stability. The result shows that the body of the landslide dam is relatively stable with less possibility of overall unstability and subsurface erosion from piping. However,the possibility that the local collapse occurs at the downstream slope is larger,which can,nevertheless,not impact the overall stability of the dam. Therefore,the unstable mode to possibly occur is the damage from overtopping erosion.
引文
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[2]Costa J E,Schuster R L.The formation and failure of natural dams[J].Geological Society of America Bulletin,1988(100):1054-1068.
[3]柴贺军,刘汉超,张倬元.中国滑坡堵江事件目录[J].地质灾害与环境保护,1995,6(4):1-9.
[4]柴贺军,刘汉超,张倬元,等.天然土石坝稳定性初步研究[J].地质科技情报,2001,20(1):77-81.
[5]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.
[6]殷跃平.汶川八级地震地质灾害研究[J].工程地质学报,2008,16(4):433-444.
[7]严祖文,魏迎奇,蔡红.堰塞坝形成机理及稳定性分析[J].中国地质灾害与防治学报,2009,20(4):55-59.
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