›› 2010, Vol. 31 ›› Issue (11): 3464-3468.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of development of strain and pore water pressure during liquefaction of saturated Lanzhou loess

SUN Hai-me i 1, 2,WANG Lan-ming 1, 2,WANG Ping 1, 2,LIU Hong-mei 1, 2   

  1. 1. Lanzhou Research Base of Earthquake Sciences, China Earthquake Administration, Lanzhou 730000, China; 2. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
  • Received:2009-08-12 Online:2010-11-10 Published:2010-11-24

Abstract:

Using a dynamic hollow cylinder apparatus WF12440 as the test platform, this paper firstly studied the loess saturation by the back pressure method. The developments of pore water pressure, axial strain, deviatoric stress-axial strain curve during liquefaction are then investigated. Testing results indicate that the back pressure method can be successfully used for loess saturation; and the pore water pressure coefficient could achieve 0.95 and more. Under the condition of isotropic consolidation, pore water pressure increased slowly at the beginning; after several cycles the pore water pressure increased rapidly until it reached the effective consolidation pressure. The deviatoric stress-axial strain curve developed with the increase of cycles; and plastic strain increased step by step. When the axial strain was less than 2%, the pore water pressure increased slowly; afterwards, its increase ratio was much larger, and a strain of 3% could appear at the initial liquefaction process. Before liquefaction of the loess, the mean effective stress under negative deviatoric stress is larger than that under the positive deviatoric stress.

Key words: loess, liquefaction, pore water pressure, strain, experimental study

CLC Number: 

  • TU 435
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