“6.1”芦山地震作用下宝兴新华村滑坡动力响应与失稳过程离散元模拟

周赞; 罗永红; 南凯; 李均益; 马潇

doi:10.19509/j.cnki.dzkq.tb20230157

“6.1”芦山地震作用下宝兴新华村滑坡动力响应与失稳过程离散元模拟

doi: 10.19509/j.cnki.dzkq.tb20230157

周赞^a,,
罗永红^{a, b, ,},
南凯^a,
李均益^a,
马潇^a

a.
成都理工大学环境与土木工程学院, 成都 610059
b.
成都理工大学地质灾害防治与地质环境保护国家重点实验室, 成都 610059

基金项目:

国家自然科学基金项目 42077257

地质灾害防治与地质环境保护国家重点实验室开放基金项目 SKLGP2019K024

详细信息

作者简介:
周赞, E-mail: 445103631@qq.com

通讯作者:
罗永红, E-mail: 445890689@qq.com

中图分类号: P642.22
计量
- 文章访问数: 253
- PDF下载量: 39
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-23
- 修回日期: 2023-05-09

Discrete element simulation of the dynamic response and instability process of the Xinhua Village landslide in Baoxing County under the "6.1" Lushan earthquake

ZHOU Zan^a
,,
LUO Yonghong^{a, b
, ,},
NAN Kai^a,
LI Junyi^a,
MA Xiao^a

a.
College of Environment & Civil Engineering, Chengdu University of Technology, Chengdu 610059, China
b.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

More Information

Author Bio:
ZHOU Zan, E-mail: 445103631@qq.com

Corresponding author: LUO Yonghong, E-mail: 445890689@qq.com

摘要

摘要:
斜坡浅表层是各类地震地质灾害发育的潜在破坏位置, 坡面形态和坡体结构往往造成斜坡动力响应及破坏的复杂化。为探究不稳定斜坡浅表潜在滑动层动力响应特征与失稳过程, 以芦山M_s6.1级地震触发的新华村滑坡为例, 基于现场调查采用离散元方法建立了二维计算模型, 分析了该斜坡潜在滑动层及坡面形态的动力响应特征并对其失稳过程进行了模拟。结果表明: ①斜坡浅表潜在滑动层具有强烈动力放大效应; ②微地貌对于潜在不稳定斜坡坡面的放大效应具有明显的影响, 浅表潜在滑动层水平向及竖直向加速度在凸出部位的放大效应显著, 凹陷部位相较于凸出部位放大效应较低; ③研究揭示新华村滑坡在微地貌的作用下凸起地形呈现先于凹陷地形遭受破坏, 其失稳过程分为震动放大局部震裂-凸出地形破坏-凹陷地形破坏-完全破坏整体下滑-重力堆积5个阶段。该研究结果有助于提升防灾人员对地震诱发潜在不稳定斜坡失稳的认识, 为防灾减灾提供理论和数据支撑。
- 芦山M_s6.1级地震 /
- 地震滑坡 /
- 动力响应 /
- 变形破坏模型 /
- 二维离散元模拟 /
- 新华村滑坡
Abstract: Objective
The shallow potential sliding layer of a slope is an important feature in seismic geological disasters. Its characteristics, such as slope shape and slope structure, tend to complicate the dynamic response and slope damage.
Methods
In this paper, the landslide in Xinhua Village, triggered by the Lushan M_s 6.1 earthquake, is taken as a case study, and two-dimensional discrete element computational models are developed based on a field investigation. The dynamic response and simulate instability are investigated by comparing numerical simulations of homogeneous and heterogeneous models, representing pure terrain and a shallow potential sliding layer, respectively.
Results
The findings are as follows: (1) The potential sliding layer at the shallow surface of the slope exhibits significant dynamic amplification, which typically increases nonlinearly with height; (2)The slope surface shape has an obvious influence on the slope amplification effect.In the convex part, the amplification effect of the horizontal and vertical acceleration of the slope surface is significant, while the amplification effect of the concave part is lower than that of the convex part; (3) In the Xinhua Village landslide, the convex terrain is destroyed before the concave terrain under the effect of micromorphology, and its instability process is divided into five stages, namely, local seismic cracking of vibration amplification, convex terrain destruction, concave terrain destruction, complete destruction of the overall slide and gravity accumulation.
Conclusion
The research results are helpful for deepening the understanding of potential unstable slopes induced by earthquakes and shedding light on disaster prevention and mitigation.
- Lushan M_s 6.1 earthquake /
- seismic landslide /
- dynamic response /
- deformation and failure model /
- two-dimensional discrete element simulation /
- Xinhua Village landslide
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 芦山M_s 6.1级地震影响区域平面图

a.新华村滑坡2013年影像; b.新华村滑坡2015年影像; c.现场无人机影像图; d.滑坡滑床基岩出露; e.坡脚块碎石堆积滑体

Figure 1. Plan map of the area affected by the Lushan M_s 6.1 earthquake

下载: 全尺寸图片幻灯片

图 2 新华村滑坡现场调查照片

Figure 2. Photographs of site investigation of the Xinhua Village landslide

下载: 全尺寸图片幻灯片

图 3 新华村滑坡地质剖面图(a)及滑前地形图(b)

Figure 3. Geological section of the Xinhua Village landslide (a) and topographic map before sliding (b)

下载: 全尺寸图片幻灯片

图 4 新华村滑坡数值模拟模型及监测点分布图

a.非均质体模型; b.均质体模型

Figure 4. Numerical simulation model of the Xinhua Village landslide and distribution of monitoring points

下载: 全尺寸图片幻灯片

图 5 新华村滑坡离散元计算模型

Figure 5. Discrete element model of the Xinhua Village landslide

下载: 全尺寸图片幻灯片

图 6 广元石井监测台站加速度时程(a)及加速度频谱图(b)

Figure 6. Ground acceleration records of Shijing station in Guangyuan (a) and the corresponding horizontal amplitude spectra (b)

下载: 全尺寸图片幻灯片

图 7 模型最大不平衡力及边界加速度时间变化曲线

Figure 7. Variation curve of the maximum unbalanced force and acceleration records of the model boundary

下载: 全尺寸图片幻灯片

图 8 坡体内部纵向监测点PGA放大系数图

Figure 8. PGA amplification factors of longitudinal monitoring points inside the slope

下载: 全尺寸图片幻灯片

图 9 均质及非均质模型加速度时程对比图

Figure 9. Comparison of acceleration time courses for homogeneous and heterogeneous models(Point C)

下载: 全尺寸图片幻灯片

图 10 均质(a)及非均质(b)模型坡面监测点PGA放大系数图

Figure 10. PGA amplification factors at monitoring points in the homogeneous (a) and heterogeneous (b) models

下载: 全尺寸图片幻灯片

图 11 非均质模型凸出(a)、凹陷(b)位置加速度时程对比图

Figure 11. Comparison of acceleration timescales at protruding (a) and recessed (b) locations for heterogeneous model

下载: 全尺寸图片幻灯片

图 12 坡面监测点A~G位移时程曲线

Figure 12. Displacement time history curves of the slope monitoring points A-G

下载: 全尺寸图片幻灯片

图 13 模型计算不同时间点位移矢量图

Figure 13. Displacement vector diagrams of landslide elements at different running times of the numerical model

下载: 全尺寸图片幻灯片

表 1 斜坡岩土体物理力学参数

Table 1. Physical-mechanical parameters of slope geotechnics

岩性	密度/(kg·m^-3)	体积模量/GPa	剪切模量/GPa	黏聚力/MPa	内摩擦角/(°)
微新砂岩	2 650	21.50	12.2	5.0	45
强风化砂岩	2 300	9.67	6.1	0.5	35

下载: 导出CSV

表 2 结构面力学参数

Table 2. Mechanical parameters of the structural planes

结构面	法向刚度/GPa	剪切刚度/GPa	黏聚力/MPa	摩擦角/(°)	抗拉强度/MPa
层面	2.1	1.40	2.0	35	0.60
潜在滑动面	1.2	0.65	0.2	21	0.01

下载: 导出CSV

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