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强震作用下斜坡表面放大效应的三维离散元模拟

蔡国军 陈锡锐 孙文鹏 贾俊

蔡国军, 陈锡锐, 孙文鹏, 贾俊. 强震作用下斜坡表面放大效应的三维离散元模拟[J]. 地质科技通报, 2022, 41(2): 104-112. doi: 10.19509/j.cnki.dzkq.2022.0058
引用本文: 蔡国军, 陈锡锐, 孙文鹏, 贾俊. 强震作用下斜坡表面放大效应的三维离散元模拟[J]. 地质科技通报, 2022, 41(2): 104-112. doi: 10.19509/j.cnki.dzkq.2022.0058
Cai Guojun, Chen Xirui, Sun Wenpeng, Jia Jun. Three-dimensional discrete element simulation of the amplification effect of the slope surface under the action of strong earthquakes[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 104-112. doi: 10.19509/j.cnki.dzkq.2022.0058
Citation: Cai Guojun, Chen Xirui, Sun Wenpeng, Jia Jun. Three-dimensional discrete element simulation of the amplification effect of the slope surface under the action of strong earthquakes[J]. Bulletin of Geological Science and Technology, 2022, 41(2): 104-112. doi: 10.19509/j.cnki.dzkq.2022.0058

强震作用下斜坡表面放大效应的三维离散元模拟

doi: 10.19509/j.cnki.dzkq.2022.0058
基金项目: 

地质灾害防治与地质环境保护国家重点实验室自主研究课题 SKLGP2019Z017

自然资源部中国地质调查局地质调查项目 DD20190714

国家自然科学基金青年基金项目 41202209

国家自然科学基金项目 41977255

四川省科技计划 2019YJ0403

详细信息
    作者简介:

    蔡国军(1982—),男,高级实验师,主要从事地质工程与岩土工程方面的研究工作。E-mail:caiguojun@cdut.cn

    通讯作者:

    陈锡锐(1997—),男,现正攻读地质工程专业硕士学位,主要从事地质工程与岩土工程方面的研究工作。E-mail:719039252@qq.com

  • 中图分类号: P642.22

Three-dimensional discrete element simulation of the amplification effect of the slope surface under the action of strong earthquakes

  • 摘要: 为研究强震作用下斜坡表面的动力放大效应, 以陕西勉县某岩质斜坡为例, 建立了三维模型。运用离散元软件3DEC, 模拟了动力条件下斜坡的变形失稳过程, 分析了斜坡表面的动力响应特征, 研究了不同地震波输入工况条件下坡体表面动力响应差异。研究结果表明: 考虑地震纵波的影响时, 竖向加速度得到显著增强, 坡面的PGA放大系数增强了约1.62倍; 坡面形态强烈影响着斜坡表面的动力响应特征, 强震作用下, 斜坡坡肩及坡形转折处的放大效应均十分强烈, 凸出部位次之, 坡表两侧的放大效应最弱; 不同输入工况下, 斜坡坡形转折处的水平向PGA放大系数均维持较高值, 特别是在仅输入水平向加速度的条件下, 该部位在地震滑坡灾害预防中应特别注意; 强震作用下滑坡的运动过程可概括为滑坡孕育启动阶段—挤压碰撞高速运动阶段—堆积阶段。研究成果可为该地区防灾减灾工作提供一定理论支持。

     

  • 图 1  斜坡全貌图

    a.斜坡平面图; b.无人机航拍影像图

    Figure 1.  Overall view of the slope

    图 2  斜坡A-A′剖面图

    Figure 2.  Section view of slope A-A′

    图 3  模型建立过程

    Figure 3.  Process of model building

    图 4  坡表监测点布置

    Figure 4.  Layout of monitoring point of the slope surface

    图 5  卧龙波加速度记录数据(Acc(max)为峰值加速度)

    Figure 5.  Record data of Wolong wave acceleration

    图 6  两向加速度同时输入工况下坡面动力响应云图

    Figure 6.  Cloud map of the dynamic response of the two-way acceleration input into the slope simultaneously

    图 7  仅水平向加速度输入工况下坡面动力响应云图

    Figure 7.  Cloud map of the dynamic response of the horizontal acceleration input into slope

    图 8  近场工况下坡表放大效应(图中数字对应图 4中的监测点号)

    Figure 8.  Acceleration coefficient curve of the slope surface

    图 9  滑坡运动过程模拟

    Figure 9.  Simulation of the landslide movement process

    图 10  A-A′剖面滑坡运动位移云图

    Figure 10.  A-A′s section landslide movement displacement cloud map

    图 11  坡面放大系数分布直方图

    Figure 11.  Histogram of the distribution of the slope magnification effect

    表  1  岩体材料参数

    Table  1.   Material parameters of rock mass

    岩体及结构面 抗拉强度/MPa 弹性模量/MPa 泊松比 黏聚力/MPa 内摩擦角/(°) 法向刚度/GPa 切向刚度/GPa
    基岩 0.7 2 685 0.26 1.65 30
    滑体 0.2 2 570 0.24 0.85 15
    J1、J2 0.65 15 1.8 1.3
    J3、J4 0.88 16 2.0 1.6
    下载: 导出CSV
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