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基于Newmark模型的天水市北山地震黄土滑坡危险性评价

程小杰 杨为民 向灵芝 张树轩 李焕彬

程小杰, 杨为民, 向灵芝, 等, 2017. 基于Newmark模型的天水市北山地震黄土滑坡危险性评价. 地质力学学报, 23 (2): 296-305.
引用本文: 程小杰, 杨为民, 向灵芝, 等, 2017. 基于Newmark模型的天水市北山地震黄土滑坡危险性评价. 地质力学学报, 23 (2): 296-305.
CHENG Xiao-jie, YANG Wei-min, XIANG Ling-zhi, et al., 2017. RISK ASSESSMENT OF SEISMIC LOESS LANDSLIDE BASED ON NEWMARK MODEL IN BEISHAN, TIANSHUI CITY. Journal of Geomechanics, 23 (2): 296-305.
Citation: CHENG Xiao-jie, YANG Wei-min, XIANG Ling-zhi, et al., 2017. RISK ASSESSMENT OF SEISMIC LOESS LANDSLIDE BASED ON NEWMARK MODEL IN BEISHAN, TIANSHUI CITY. Journal of Geomechanics, 23 (2): 296-305.

基于Newmark模型的天水市北山地震黄土滑坡危险性评价

基金项目: 

中国地质调查局地质调查项目"西秦岭北缘断裂带天水段地震地质灾害调查评价"项目 12120114035601

详细信息
    作者简介:

    程小杰(1990-), 男, 硕士研究生, 从事地质灾害、数值模拟等方面的研究。E-mail:845767883@qq.com

    通讯作者:

    杨为民(1965-), 男, 研究员, 博士, 从事地质灾害、工程地质及活动断裂研究工作。E-mail:snon_72@163.com

  • 中图分类号: P631.8

RISK ASSESSMENT OF SEISMIC LOESS LANDSLIDE BASED ON NEWMARK MODEL IN BEISHAN, TIANSHUI CITY

  • 摘要: 本文通过天水市北山野外调查和室内分析相结合的方法,开展基于Newmark累积位移法的地震黄土滑坡危险性分析。分析了研究区的孕灾背景,结合现有滑坡和不稳定斜坡的调查数据,在充分考虑了震源方位角和斜坡坡向角的角度关系基础上,对优势坡向角和劣势坡向角下的斜坡易发性进行分析计算,然后用回归方程求出PGA为0.3 g时斜坡的累积位移,最后计算出斜坡在地震荷载下的失稳概率。在此基础上,对北山进行地震黄土滑坡的危险性评价。分析结果表明:在Newmark模型的地震黄土滑坡危险性评估中引入斜坡坡向角和震源方位角关系,有利于提高小区域(大比例尺)风险评估的准确性。

     

  • 图  1  天水市北山位置和滑坡分布图

    Figure  1.  Location and landslide distribution of Beishan, Tianshui

    图  2  天水市及周边断裂和历史地震(Ms≥6.0级)分布图

    F1—西秦岭北缘断裂;F2—迭部—白龙江断裂;F3—礼县—罗家堡断裂;F4—六盘山断裂;F5—海原断裂

    Figure  2.  Distribution of faults and historical earthquake sites (Ms≥6.0) in Tianshui City and its vicinity

    图  3  Newmark模型滑体静力受力图和地震加速度水平分解图

    Figure  3.  Static force diagram of Newmark model and diagram of seismic acceleration horizontal decomposition

    图  4  考虑斜坡坡向角的Newmark累积位移求解原理图

    Figure  4.  Principle diagram of Newmark cumulative displacement model in consideration of the slope angle

    图  5  Fs求解参数因子栅格图

    Figure  5.  Grid diagramaboutparameters factor of Fs

    图  6  北山静态安全系数Fs栅格图

    Figure  6.  Grid diagram of static safety factor Fs in Beishan

    图  7  优势坡向角下的斜坡临界加速度a′c1

    Figure  7.  Critical acceleration a′c1 of slope under dominant slope angle

    图  8  劣势坡向角下的斜坡临界加速度a′c2

    Figure  8.  Critical acceleration a′c2 of slope under adverse slope angle

    图  9  优势坡向角和劣势坡向角的斜坡累积位移栅格图

    (a)优势坡向角(b)劣势坡向角

    Figure  9.  Grid diagram of accumulative displacement under dominant slope angle & adverse slope angle

    图  10  优势坡向角下斜坡失稳概率图

    Figure  10.  Diagram of instability probability of slope under dominant slope angle

    图  11  劣势坡向角下斜坡失稳概率图

    Figure  11.  Diagram of instability probability of slope under adverse slope angle

    表  1  北山岩土体物理力学参数取值表

    Table  1.   Physical and mechanical parameters of rock and soil in Beishan

    岩组 坚硬
    (变质岩)
    较坚硬
    (砂砾岩)
    较软(松散
    沉积物,
    藉河,
    红旗山)
    软弱(松散
    堆积物,距河
    流较近,
    锻压厂)
    φ′/° 40 35 24.5 22.2
    c′/Pa 220000 140000 90400 59500
    γ/(N·m -3) 24500 23000 17800 17500
    下载: 导出CSV

    表  2  累积位移Dn的Weibull函数拟合参数表

    Table  2.   The table of Weibull function fitting parameter of cumulative displacement

    Dn P(Dn)
    0.005 0.0891
    0.05 0.0936
    0.5 0.1566
    1.5 0.1720
    2.0 0.1921
    下载: 导出CSV
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  • 收稿日期:  2016-12-20
  • 刊出日期:  2017-04-28

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