Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (4): 1153-1167.doi: 10.13278/j.cnki.jjuese.201604202

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Genetic Mechanism and Disasters Features of Complicated Structural Rock Mass Along the Rapidly Uplift Section at the Upstream of Jinsha River

Chen Jianping1, Li Huizhong2   

  1. 1. College of Construction Engineering, Jilin University, Changchun 130026, China;
    2. Survey Planning and Design of the Yangtze River Co., Ltd., Wuhan 430010, China
  • Received:2016-02-02 Online:2016-07-26 Published:2016-07-26
  • Supported by:

    Supported by Major Project of National Natural Science Foundation of China(41330636)

Abstract:

Ravines & gullies crisscrossed that makes hydropower resources abundant at the up reaches of Jinsha River, north slope of Hengduan Mountain. Since the Middle and the Late Pleistocene, rapidly uplift neotectonic activity gives rise to gravitational deformation and disasters occurrence due to the complexed structural rock mass in this river section. Basic geological background due to high geostress and the basic features of the complicated structural rock mass for ophiolite suite developed in Jinsha River plate tectonics joint belt of this river section were stated. A new concept of rapid uplift river section is put forwarded, annul uplift value up to ≥5 mm/a is recommended to be the threshold of rapid uplift river section. Evidences and basic features related to four events of huge landslide dams originated from defferent time and different scale were enumerated, the relationship between the rapid uplift river section and four landslide dams was expressed. Genetic mechanism of four huge landslide dams developed in the reach of 21.4 km river section was disccussed and analyzed based on geological process mechanism method, and earlier landslide dam residual might be a potential harzadous for the future human activities is pointed out.

Key words: rapidly uplift river section, complicated structural rock mass, landslide dam residual, potential harzadous, upstream Jinsha River

CLC Number: 

  • P642.22

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