基于颗粒离散元的香坪山滑坡演化特征研究

    STUDY ON EVOLUTION CHARACTERISTICS OF XIANGPINGSHAN LANDSLIDE BASED ON PARTICLE DISCRETE ELEMENT METHOD

    • 摘要: 云南文麻高速的安全运营遭受了香坪山滑坡的严重制约。为发挥文麻高速的战略意义,需查清香坪山滑坡的变形破坏特征,揭示滑坡形成演化机理。本文结合地质调查、数值模拟和现场监测,研究了香坪山滑坡的成因机制、变形演化特征、潜在稳定性、治理方案等。变形破坏迹象和数值模拟结果得到了相互验证,结果表明:(1)香坪山滑坡为中型岩土混合牵引式滑坡,岩体先期反倾破坏部位长期遭受地下水作用在坡内产生泥化软弱带,形成潜在滑带,最终因坡脚开挖而引起坡体变形破坏;(2)沿斜坡纵剖面方向,滑体中、后部变形速率相差较小,前缘因临空条件不同而变形速率有所差异,在横向上则因地形变化而变形差异较大;(3)滑坡长期演化后可能产生新滑面,并从抗滑桩顶部越顶剪出,对高速公路的安全运营具有潜在威胁;(4)两排抗滑桩和坡体截排水对香坪山滑坡治理是有效可靠的。

       

      Abstract: The safe operation of Wenshan-Malipo Expressway is seriously affected by the Xiangpingshan landslide. In this paper,the genetic mechanism,evolution characteristics,potential stability and treatment measures of Xiangpingshan landslide are studied by conducting geological survey,numerical simulation and field monitoring. The numerical simulation results are consistent with the deformation and failure features in the field. The research results show that: (1)Xiangpingshan landslide is a medium-scale traction landslide composed of rock-soil mixtures,the muddy weak layer is formed in the slope as a potential slip zone due to the long-term action of groundwater at pre-topping failure part of rock mass,and slope deformation and failure are finally caused by the excavation at the slope toe; (2)In the longitudinal direction,the deformation rates of the middle and rear parts of the sliding body show slight variation since the muddy weak zone becomes a unified sliding zone,but the deformation rates at the leading edge vary with different free conditions,and the deformation features vary greatly in the transverse direction with topographic changes; (3)A new sliding surface is gradually forming after long-term evolution of the sliding body and causes the failure from the top of the anti-slide pile,threating the safe of the expressway; (4)Two rows of anti-slide piles and water interception-drainage measures are effective and reliable in the treatment of Xiangpingshan landslide.

       

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