随机地震荷载作用下黄土的液化特性

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Abstract Certain earthquake waves with 10% exceeding probability in the following 50 years of the field are input as vibration wave to carry out the dynamic triaxial test to research the increasing characteristic，model and effect of pore water pressure of loess samples，which are adopted from the back of a loess landslide in village of Xiajiadalu Xijiawan，Xiji County of Ningxia Province. The results show that the response of pore water pressure in loess delays the vibration wave obviously，and increase in the range of effective time of vibration wave mainly. In addition，the amplitude，effective time of the seismic load and consolidation pressure influence the liquefaction character of loess significantly. The loess samples which suffer a seismic dynamic load with larger amplitude，longer effective time and lower consolidation pressure would induce increase of pore water pressure easily. In addition，for the increase of pore water pressure is induced by the reduction of pore，so the pore water pressure ratio could be expressed by a function of residual strain；and the level of pore water pressure and liquefaction degree of loess under different deformations could be gained under earthquake load.

Key words： soil mechanics stochastic seismic load liquefaction of loess pore water pressure ratio increase rule of pore water pressure

Received: 13 December 2011

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http://www.rockmech.org/EN/Y2012/V31/I6/1274

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