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《Geological Review》 1992-06
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A MECHANISM OF HIGH-SPEED LOESS LANDSLIDES——SATURATED LOESS CREEPING LIQUEFACTION

Wang Jiading Geological Hazards Institute, Gansu, Academy of Science, Lanzhou, Gansu  
In this paper, the author proposes a mechanism of highspeed loess landslides-saturated loesss creeping liquefaction. A number of examples of Gansu are given andits mechanism is analysed from changes of the inner intensity of loess structure andstress conditions before and after saturated loess is subject to the stress. It is provedby field and laboratory tests that the liquefaction degree of saturated loess is incre-ased with the growth of shearing stres, shearing velocity and degree of saturationand that the initial liquefaction critical value of saturated loess varies from 0.075to 0.13 kgf/cm~2. Because the properties of loess with a saturation degree of morethan 80% are in keeping with those of loess with 100% saturation, it is suggestedthat the soil with a saturation degree of more than 80% is saturated soil. Besides,the author proposes the following process of high--speed landslide trigged by satu-rated loess creeping and sliding liquefaction: irrigation or heavy raining→formationof saturated loess belt→decrease in c and φ values of and formation of slip surfacesin loess bed→creeping of slide body→slight liquefaction→sliding→high--degree lique-faction to complete liquefaction→high--speed sliding→production of mud flow. Final-ly, the velocity of high--speed landslides and mud flow is disscussed.
【Fund】: 甘肃省自然科学基金(编号:ZR—90—01)
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