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| LIQUEFACTION PROPERTY OF LOESS UNDER STOCHASTIC SEISMIC LOAD |
| DENG Longsheng1，FAN Wen1，2，3，HE Longpeng1 |
(1. College of Geological Engineering and Geomatic，Chang?an University，Xi?an，Shaanxi 710054，China；
2. Key Laboratory of Western Mineral Resources and Geological Engineering，Ministry of Education，Chang?an University，Xi?an，Shaanxi 710054，China；3. Open Research Laboratory of Geotechnical Engineering，Ministry of Land Resources，Chang?an University，Xi?an，Shaanxi 710054，China) |
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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.
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Received: 13 December 2011
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2012, Vol. 31 
