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西秦岭北缘断裂宝鸡—武山段活动触发滑坡分布规律与成因机制

辛鹏 吴树仁 张泽林 刘甲美 王涛 石菊松

辛鹏, 吴树仁, 张泽林, 等, 2017. 西秦岭北缘断裂宝鸡—武山段活动触发滑坡分布规律与成因机制. 地质力学学报, 23 (5): 723-733.
引用本文: 辛鹏, 吴树仁, 张泽林, 等, 2017. 西秦岭北缘断裂宝鸡—武山段活动触发滑坡分布规律与成因机制. 地质力学学报, 23 (5): 723-733.
XIN Peng, WU Shuren, ZHANG Zelin, et al., 2017. DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE. Journal of Geomechanics, 23 (5): 723-733.
Citation: XIN Peng, WU Shuren, ZHANG Zelin, et al., 2017. DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE. Journal of Geomechanics, 23 (5): 723-733.

西秦岭北缘断裂宝鸡—武山段活动触发滑坡分布规律与成因机制

基金项目: 

国家自然基金项目 41402281

国家自然基金项目 41372374

中国地质调查局项目 1212011220088

中国地质调查局项目 DD20160271

详细信息
    作者简介:

    辛鹏(1984-), 男, 副研究员, 主要从事滑坡机理与风险评估研究。E-mail:xinpengcugs@126.com

    通讯作者:

    石菊松(1976-), 男, 副研究员, 主要从事滑坡风险评估研究。E-mail:shijusong@126.com

  • 中图分类号: P642.22

DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE

  • 摘要: 西秦岭北缘断裂沿"一带一路"交通廊道展布,是南北活动构造带强震丛集发育的节点之一,地震地质灾害风险极高。基于地质调查、测绘与数值分析,查明了断裂在天水地区触发的地震滑坡分布特征,探讨了断裂触发滑坡的形成机制。研究表明:(1)西秦岭北缘活动触发的巨、大型滑坡为断裂地貌过程的一部分,易在断裂的阶区聚集发育,其枢纽部位也有零星的分布;(2)巨大型滑坡集中于历史极震区内,断裂破裂过程中的近场惯性滑移、远场地震动是主要触发因素,二者耦合作用导致巨大型滑坡在断裂带两侧具有对称分布特征,活动强度由近及远而逐渐变弱;(3)断裂水平滑移、破裂引起的斜坡滑动变形以结构面贯通为主要表现形式,具有强烈的方向效应、近直立断层的区域地震动效应及地震波的山体地形放大效应,这些力学效应在滑坡破坏过程产生断裂结构面、次级羽裂结构面与滑动面,它们协同控制了滑坡的运动;(4)极端降雨触发的泥流是巨大型滑坡堆积体复活运动的主要形式,是现今防灾减灾重点。

     

  • 图  1  西秦岭北缘断裂宝鸡-武山段展布图

    Figure  1.  Layout of the Baoji-Wushan segment at the northern margin of western Qinling fault zone

    图  2  西秦岭北缘断裂宝鸡—武山段大型滑坡地貌分布

    Figure  2.  Geomorphic distribution of large-scale landslides along the Baoji-Wushan segment at the northern margin of western Qinling fault zone

    图  3  西秦岭北缘断裂凤凰山段滑坡分布统计

    Figure  3.  Distribution statistics of landslides in the Fenghuangshan segment of northern margin fault zone of western Qinling

    图  4  公元734年地震震中滑坡分布

    Figure  4.  Distribution characteristics of landslides in epicenter of the earthquake in 734 A.D

    图  5  西秦岭北缘断裂武山段断裂活动与滑坡的滑动方向

    Figure  5.  Sliding direction of the activities and landslides in the Wushan segment of the northern margin of western Qinling fault zone

    图  6  断裂带滑坡及其多期活动边界

    a-广武村滑坡;b-王家庄滑坡

    Figure  6.  Fault zone landslides and multi-stage activity boundaries

    图  7  西秦岭北缘典型断裂带滑坡

    a-侯家山断裂带滑坡;b-何沟村断裂带滑坡;c-李家那面断裂带滑坡

    Figure  7.  Typical landslides along the northern margin of western Qinling fault zone

    图  8  巨大型地震滑坡的近水平剪切面

    a-田家村斜坡内近水平剪切面;b-孙蔡村滑坡近水平剪出口;c-赵家窑滑坡近水平剪出口;d-李家庄滑坡近水平剪切面

    Figure  8.  Sub-horizontal shearing plane of giant and large-scale seismic landslides

    图  9  水平向地震动触发软弱夹层滑移破坏

    Figure  9.  Horizontal seismic oscillation triggering weak intercalated layer slippage destruction

    表  1  天水地区代表性的巨大型滑坡几何参数

    Table  1.   Geometrical parameters of typical giant and large-scale landslides in Tianshui Area

    序号 位置 物质组成 长度/m 重心高度/m 体积/万方 等效摩擦系数
    1 车川村滑坡 黄土与新近纪泥岩 1700 260 18500 0.15
    2 王家窑滑坡 黄土与新近纪泥岩 1900 250 17300 0.13
    3 红旗山滑坡 黄土与新近纪泥岩 1200 220 9400 0.18
    4 陈家窑滑坡 黄土与新近纪泥岩 1400 240 4100 0.17
    5 蔚家湾滑坡 黄土与新近纪泥岩 1600 250 7800 0.15
    6 侯家山滑坡 黄土与新近纪泥岩 1200 242 8900 0.20
    7 大石乡滑坡 黄土与新近纪泥岩 1900 340 6800 0.17
    8 马家山庄滑坡 黄土与新近纪泥岩 1200 240 7400 0.20
    9 菜子山滑坡 黄土 2800 420 31000 0.15
    下载: 导出CSV
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    XIN Peng, WU Shuren, SHI Jusong, et al. Slope structure on the north bank of Baoji-Fufeng section in the middle reaches of Weihe river and its indicative significance on the formation mechanism of large landslide[J]. Journal of Jilin University (Earth Science Edition), 2013, 43(2):506~514. (in Chinese with English abstract) http://xuebao.jlu.edu.cn/dxb/CN/abstract/abstract9891.shtml
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  • 收稿日期:  2017-05-30
  • 刊出日期:  2017-10-28

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