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2017 Vol. 23, No. 5
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XIN Peng, WU Shuren, ZHANG Zelin, LIU Jiamei, WANG Tao, SHI Jusong. DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE[J]. Journal of Geomechanics, 2017, 23(5): 723-733.
Citation: XIN Peng, WU Shuren, ZHANG Zelin, LIU Jiamei, WANG Tao, SHI Jusong. DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE[J]. Journal of Geomechanics, 2017, 23(5): 723-733.
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DISTRIBUTION CHARACTERISTICS AND FORMATION MECHANISM OF LANDSLIDES TRIGGERED BY ACTIVITIES OF BAOJI-WUSHAN SEGMENT AT THE NORTHERN MARGIN OF WESTERN QINLING FAULT ZONE

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Key Laboratory of Neotectonic Movement and Geohazard, Ministry of Land and Resourses, Beijing 100081, China

  • 3.

    China geological survery, Beijing 100080, China

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Received Date:  30 May 2017
Publish Date:  25 October 2017
    Abstract

  • The fault at the northern margin of western Qinling distributes along the transportation corridor of "the Belt and Road", which is one of the focuses with crowded development of strong earthquakes along the south-north active fault zone, having extremely high seismic risk of geological disasters. Based on geological survey, mapping and value analysis, the distribution characteristics of landslide disasters triggered in Tianshui area are summarized, and the mechanism for fault to trigger disasters is investigated. The study yields the following understanding:(1) As a part of geomorphic process of fault, the giant and large-scale landslides triggered by activities along the step of western Qinling fault zone easily developed in the fault zone with a scattered distribution in the hub positions of faults. (2) The giant and large-scale landslides concentrate on the meizoseismal area. When the faults start to fracture, the inertia fracture plane activities cause landslides along the fault zone and trigger seismic oscillation symmetrically distributed by the two sides of the fault zone, with the activity intensity of landslides gradually weakening from the near to the distant. (3) The slope sliding and deformation caused by horizontally fracture activities are mainly reflected by the appearance of structural plane, which features strong fracture direction effect, regional seismic oscillation effect of nearly vertical fault and mountain terrain amplification effect of seismic wave. Such mechanical effects cause fracture structure plane, secondary structure plane and sliding plane during the destruction process of landslides, and they coordinate with each other to control the slippage destruction of landslides.(4)The mud flow triggered by extreme rainfall is the main movement form of giant landslide reactivation. Now more attention of disaster prevention and mitigation should be paid on large mud flows.

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