防灾与环境

复杂运动路径下滑坡转向变形机理研究

  • 谢强 ,
  • 陈昱成 ,
  • 田仁珺 ,
  • 傅翔 ,
  • 班宇鑫
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  • 1.重庆大学 土木工程学院,重庆 400045;
    2.库区环境地质灾害防治国家地方联合工程研究中心(重庆),重庆 400045;
    3.重庆交通大学 河海学院,重庆 400074;
    4.重庆科技学院 建筑工程学院,重庆 401331
谢强(1975—),男,重庆人,博士,教授,主要从事岩土工程、地质灾害防治等领域的教学与科研工作。E-mail:xieqiang2000@163.com
班宇鑫(1989—),女,黑龙江大庆人,博士,副教授、硕士生导师,主要从事岩石力学、地质灾害防治等领域的教学与科研工作。E-mail:banyuxin@163.com

收稿日期: 2023-11-17

  网络出版日期: 2024-05-09

基金资助

重庆市规划与自然资源局科技项目(DK2021Z05null01C);重庆市地质灾害防治中心科技项目(KJ2021050)

Study on the Mechanism of Landslide Steering Deformation under Complex Moving Path

  • Xie Qiang ,
  • Chen Yucheng ,
  • Tian Renjun ,
  • Fu Xiang ,
  • Ban Yuxin
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  • 1. School of Civil Engineering, Chongqing University, Chongqing 400045, P.R. China;
    2. National Joint Engineering Research Center of Geohazards Prevention in the Reservioir Areas (Chongqing), Chongqing 400045, P.R. China;
    3. College of River and Ocean Engineering, Chongqing Jiaotong University, Chongqing 400074, P.R. China;
    4. School of Civil Engineering and Arichitecture,Chongqing University of Science & Technology, Chongqing 401331, P.R. China

Received date: 2023-11-17

  Online published: 2024-05-09

摘要

滑坡受地表地形地貌和滑面形态的影响,在运动过程中常表现出转向、分叉、聚合等复杂行为,研究复杂运动路径下滑坡转向变形机理对滑坡的防灾减灾工作有重要意义。以三维地质建模技术为基础,构建庞家湾滑坡的三维颗粒流模型。通过PFC模拟滑坡的运动过程,得到如下结论:庞家湾滑坡发生了转向和聚合行为,滑坡中后部土体的滑动方向发生偏转并在坡脚与东北区域滑体聚合;滑坡中部发生转向运动的颗粒以较快的速度首先开始滑动,且速度由滑坡中部向周围呈辐射状减小;滑坡前缘在整个运动过程中,始终保持较快的运动速度,而后缘运动速度较慢,此外滑体表面速度大于滑体内部和底面速度,而滑坡各部分运动速度不同则是造成滑坡转向变形的重要原因。揭示了复杂路径滑坡的运动规律和转向变形机理,为评估滑坡风险,采取更为合理的防治方案提供理论依据。

本文引用格式

谢强 , 陈昱成 , 田仁珺 , 傅翔 , 班宇鑫 . 复杂运动路径下滑坡转向变形机理研究[J]. 地下空间与工程学报, 2024 , 20(2) : 615 -624 . DOI: 10.20174/j.JUSE.2024.02.28

Abstract

The landslide is affected by the topography and sliding surface morphology. In the process of movement, it often shows complex behaviors such as steering, bifurcation and aggregation. It is of great significance to study the mechanism of landslide steering deformation under complex moving paths for prevention and mitigation of landslide disaster. Based on the three-dimensional geological modeling technology, the three-dimensional particle flow model of Pangjiawan landslide is constructed. Through PFC simulation of landslide movement process, following conclusions are conducted: Steering and aggregation occurred in the Pangjiawan landslide, and the sliding direction of the soil in the middle and back of the landslide deflected and the soil aggregates with that from the northeast region at slope toe; The particles with turning movement in the middle of the landslide begin to slide first with fast speed, and the speed decreases radially from the middle of the landslide to the surrounding area. The leading edge of the landslide keeps a high speed during the whole movement, while the trailing edge of the landslide moves slowly. In addition, the surface velocity of the landslide is larger than that of the interior and bottom of the landslide, and the different velocity of each part of the landslide is an important reason for the steering deformation of the landslide. It reveals the movement law and steering deformation mechanism of complex moving landslides, and provides a theoretical basis for evaluating landslide risks and adopting more reasonable prevention schemes.

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