Model Test on Deformation and Failure of Landslide in Water-level-fluctuating Zone of Three Gorges Reservoir Region

ZHOU Chang 1 HU Xin-li 1 XU Chu 1 TAN Fu-lin 1 WANG Qiang 1 XU Ying 1

(1.Faculty of Engineering, China University of Geosciences , Wuhan, Hubei, China 430074)

【Abstract】In order to clarify the mechanism of deformation and failure in the landslide fluctuation zone, by dint of the physical model test, test models of landslide fluctuation zone based on the geological characteristics of the landslide in the Three Gorges reservoir region were established. The model test material development and the scientific control of the reservoir water level fluctuation made it possible to simulate the whole process of the instability of the reservoir landslide fluctuation zone, and the deformation characteristics and mechanical mechanism of the reservoir landslide were discussed from the perspective of the experimentation. The results showed that during the first impounding, the intersecting-angle of cracks is negatively correlated with the dip angle of the bedrock. The intersecting-angle determines the direction of crack propagation and affects deformation development. The smaller the intersecting-angle is, the longer the crack will be, and the greater the deformation will be. Besides, the hysteretic nature of the water pressure is obvious, and gradually decreases with the increase in the period. The fluctuation rate of the water level will shorten the groundwater response time. Furthermore, the greater fluctuation rate of water level indicates a greater change rate of water pressure in the slope. The water level rate has the greatest influence on the underwater slope, which affects the stability of the landslide. Meanwhile, the soil structure deterioration and water floatability is the key factor of the decline of the leading edge of the landslide model. The small landslide is destroyed from the local to the whole under the action of the hydrodynamic pressure and reduced effective stress, showing a typical multi-slip progressive retrogressive mode. The results are helpful in clarifying the mechanism of landslides in the water-level-fluctuating zone and provide the reference for the evolution model and mechanical mechanism of a retrogressive landslide triggered by water level fluctuation.

【Keywords】 road engineering ; retrogressive mode ; physical model test ; water-level-fluctuating zone ; intersecting angle ; bank caving;

【DOI】

【Funds】 National Natural Science Foundation of China (41630643, 41272305) National Basic Research Program of China, 973 Program (2011CB710604)

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This Article

ISSN:1001-7372

CN: 61-1313/U

Vol 31, No. 02, Pages 252-260

February 2018

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Article Outline

Abstract

  • 0 Introduction
  • 1 Design of landslide physical model test
  • 2 Results and analysis
  • 3 Conclusions
  • References