›› 2015, Vol. 36 ›› Issue (7): 1847-1855.doi: 10.16285/j.rsm.2015.07.004

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental research on rheological properties of Q3 intact loess within ground fissures belt in Xi'an region

DENG Ya-hong1, 2, 3，LI Li1, 4，MU Huan-dong1, 2，WANG Peng5，LI Fei-xia1   

  1. 1. Department of Geology Engineering, Chang'an University, Xi'an, Shaanxi 710054, China; 2. Open Research Laboratory of Geotechnical Engineering of Ministry of Land and Resources, Chang'an University, Xi'an, Shaanxi 710054, China; 3. Key Laboratory of Western China Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an, Shaanxi 710054, China; 4. Gansu Transportation Research Institute Co., Ltd., Lanzhou, Gansu 730050, China; 5. Third Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou, Gansu 730050, China
  • Received:2014-04-01 Online:2015-07-11 Published:2018-06-13

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Abstract: The Fenhe River-Weihe River Basin is one of the areas with the most developed ground fissures and related geohazards in China and even in the world. The effect of the rheological properties of loess during the long geological history is considered as the fracture extension mode of ground fissures. Applying stepwise loading and cyclic unloading, a series of consolidated undrained triaxial tests is conducted on Q3 intact loess sampled from Chang'an ground fissures belt in Xi'an region, to examine the rheological properties of the loess with different confining pressures. The loading and unloading creep curves, strain rate vs. time curves of Q3 intact loess within ground fissures are obtained. The experimental results show that the Q3 intact loess is featured with slow creep under low stress and slow creep or constant creep under high stress. Based on the unified rheological theory, a three-dimensional creep constitutive model which is suitable for Q3 intact loess within ground fissures belt in Xi'an region is established; and parameters of the model are obtained. The results lay a foundation for studying the fracture extension model of concealed ground fissures and the mechanism behind.

Key words: ground fissures belt, Q3 intact loess, rheological test, creep constitutive, parameter identification

CLC Number: 

  • TU 444
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