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《Arid Land Geography》 2009-06
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Physical index,dynamic property and landslide of Ili loess

YIN Guang-hua1,WANG Lan-min2,3,YUAN Zhong-xia2,3,LI Zhi-qiang4,LIU Hong-mei2,WANG Ping2,WU Guo-dong1(1 Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China;2 Earthquake Administration of Gansu Province,Lanzhou 730000,Gansu,China;3 Lanzhou Science and Technology Innovative Base of Institute of Earthquake Prediction,C.E.A,Lanzhou 730000,Gansu,China;4 The Geological Environmental Monitoring of Xinjiang,Urumqi 830068,Xinjiang,China)  
We analyzed the particle size,density,water content and void ratio of 28 loess samples in the Ili valley and tested the seismic subsidence,collapsibility,dynamic modulus and plasticity index.The physical property and dynamic characteristic of loess in the Ili Valley were discussed.The relationship between the loess characteristic and the landslide was talked over.The primary loess of Ili valley was formed in late Pleistocene and is mainly composed of silt particle,including 74 percent.The particle of 75-5 μm is 10 percent and that less than 5 μm is 15 percent;the natural water content of loess is 4-16.1 percent.The loess of the east valley is obviously finer than that of the west valley.It indicates that the loess was rooted in the west hungriness and related to the conveying function of the westerly wind.The void ratio of Ili loess is 0.832-0.907,going with considerable collapsibility.Although the water content is less than 20 percent,the collapse may happen.The plastic index of the loess is about 9,comparatively small.The clay content is low and the vulnerability is high.The seismic performance is bad and the seismic subsidence is comparatively strong.Under the same dynamic strain condition,the dynamic modulus of Ili loess is smaller.With the accretion of dynamic strain,the attenuation of dynamic modulus is quick.The landslide often happens in the spring melting season,caused by freezing-thawing function in winter.The geological disaster also happens in the distinctly active structure.It is great valuable for reference to recognize the characteristic of Ili loess and prevent the loess landslide.
【Fund】: 国家自然科学基金项目(40562001)和(40864003)
【CateGory Index】: P642.131
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