›› 2018, Vol. 39 ›› Issue (3): 815-822.doi: 10.16285/j.rsm.2016.0921

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Dynamic pore-water pressure evolution of tailings under different consolidation conditions

ZHANG Xiu-zhao1, 2, 3, WU Shang-wei4, ZHANG Chao1, YANG Chun-he1   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3. Zhongye Changtian International Engineering Co., Ltd., Changsha, Hunan 410205, China; 4. Safety Engineering College, Chongqing University of Science and Technology, Chongqing 401331, China
  • Received:2016-04-25 Online:2018-03-12 Published:2018-06-06
  • Supported by:

    This work was supported by the National Key R. & D. Program of China (2017YFC0804600), the National Natural Science Foundation of China (51741410) and the State Key Program of National Natural Science of China (51234004).

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Abstract: Tailings dam is in danger of liquefied instability under earthquake. The liquefaction process can be indirectly reflected by the evolution rule of the dynamic pore-water pressure. To study the dynamic pore-water evolution, a series of dynamic triaxial tests is conducted. The results show that: the development of dynamic pore-water pressure of the tailings is characterized with different stages, including an S-shaped curve under isotropic consolidation and a J-shaped curve under anisotropic consolidation. The critical pore-water pressure of tailings is close to confining pressure under isotropic consolidation. The critical pressure, less than confining pressure under anisotropic consolidation, decreases with the increase of confining pressure and consolidation stress ratio, and increases as the average particle size of tailings increases. The critical pore-water pressure equations under the condition of isotropic consolidation and anisotropic consolidation are derived based on the theory of limit equilibrium, which explain the dynamic evolution of pore-water pressure observed in dynamic triaxial tests. The results provide reference for seismic design of upstream tailings dam in earthquake area.

Key words: tailings, dynamic triaxial tests, pore-water pressure evolution rule, pore-water pressure model, critical pore-water pressure

CLC Number: 

  • TU 411

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