Formation mechanism analysis of Wulipo landslide-debris flow in Dujiangyan city

DU Guo-liang; ZHANG Yong-shuang; YAO Xin; GUO Chang-bao; YANG Zhi-hua

doi:10.16285/j.rsm.2016.S2.064

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Formation mechanism analysis of Wulipo landslide-debris flow in Dujiangyan city

更新时间：2026-06-25

- Formation mechanism analysis of Wulipo landslide-debris flow in Dujiangyan city
- Vol. 37, Issue S2, Pages: 493-501(2016)
- 作者机构：
  
  1. 中国地质科学院地质力学研究所国土资源部新构造运动与地质灾害重点实验室,北京,100081
  2. 中国地质科学院地质力学研究所,北京,100081
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2016.S2.064
  CLC： P644.22
- Online First：09 June 2018，
  
  Published：2016
- 稿件说明：
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DU Guo-liang, ZHANG Yong-shuang, YAO Xin, et al. Formation mechanism analysis of Wulipo landslide-debris flow in Dujiangyan city[J]. 2016, 37(S2): 493-501.
DOI：

DU Guo-liang, ZHANG Yong-shuang, YAO Xin, et al. Formation mechanism analysis of Wulipo landslide-debris flow in Dujiangyan city[J]. 2016, 37(S2): 493-501. DOI： 10.16285/j.rsm.2016.S2.064.

摘要

2013年7月10日发生的四川省都江堰市中兴镇三溪村五里坡滑坡-碎屑流，属于典型的降雨型高位斜向层状岩质滑坡-碎屑流灾害。在前人研究成果梳理和进一步野外调查的基础上，分析总结了五里坡滑坡-碎屑流的成因及演化模式，并对五里坡高位滑坡在降雨作用下的后缘裂隙扩展判据和滑坡启动判据进行了定量计算。研究表明，五里坡滑坡的演化模式为后缘拉张裂隙形成→降雨作用下裂缝开始扩展→动、静水压力联合作用下斜坡沿泥质软弱层滑动→后缘拉裂槽形成→“7?10”强降雨诱发滑坡复活→滑体前缘临空崩落、加速→崩滑体沿沟谷铲刮、运移→堆积停止。从力学角度推导了前期降雨作用下滑体后缘裂缝自动扩展的最小深度、滑坡失稳的临界水头高度和临界降雨强度的计算公式，得出充满水的后缘裂缝在静水压力作用下开始自行扩展的临界深度为11.3 m；后缘裂隙贯通至滑带后，当五里坡斜坡体在后缘裂缝水头高度达到9.8 m时滑坡处于启动的临界状态。

Abstract

On July 10

2013

a high-position landslide-debris flow was triggered by the heavy rainfall at Wulipo Sanxi village

Dujiangyan city

Sichuan province. The landslide-debris flow caused serious damages to Sanxi village. On the basis of further field investigation and previous research results

the formation mechanism and evolution process of the Wulipo landslide-debris flow are analyzed. Considering the actual mechanical behavior of the Wulipo landslide

the crack extending criterion under hydrostatic pressure and landslide start-up criterion under rainfall are calculated. The results show that the evolution process of the Wulipo landslide-debris flow includes following steps: formation of unloading crack

crack extending under hydrostatic pressure

slope sliding along the potential sliding surface under the effects of both hydrostatic and hydrodynamic pressures

rift trough forming

landslide reactivation due to heavy rain

rock blocks falling and accelerating

shoveling and moving along the valley

stacking and stop moving. By deducing minimum depth of water in the crack leading to crack automatically developing

critical water height in back crack and critical rainfall intensity causing slope instability

it is concluded that the crack could automatically develop when the depth of water in the crack reached 11.3 m; and the slope would lose its stability once the height of the water level in back crack reached 9.8 m.

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