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Ground Fissures Germination Mechanism of Deep Structure Activities in Weihe Basin

Deng Yahong1,2,3，Peng Jianbing1,2,3，Mu Huandong3，Li li3，Sun Zhenfeng3   

  1. 1.Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an710054, China;
    2.Open Research Laboratory of Geotechnical Engineering, Ministry of Land and Resources, Chang’an University, Xi’an710054, China;
    3.Department of Geological Engineering, Chang’an University, Xi’an 710054, China
  • Received:2012-06-17 Online:2013-03-26 Published:2013-03-26

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Abstract:

Weihe basin is the most developed area of ground fissures and its hazard is also the most serious in China, even in the world. Based on the deep structure mode of Weihe basin, a numerical analysis with finite element method is made to study the stress and strain response of superficial ground subjected to the deep tectonization of upper mantle uplifting, middle crust lateral stretching and upper crust tension. The germination relationship between deep structure activities and ground fissures development is revealed. Results show that the tensile tress environment is formed by upper mantle uplifting and middle crust lateral stretching, which combines with stretching stress fields induced by surrounding blocks activity and faults dipslip, constitute the main motive resource of ground fissures development.

Key words: ground fissures, germination mechanism, deep structure activities, Weihe basin, structure

CLC Number: 

  • P642
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