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Evolution of macro-meso properties of intact loess under long-term seepage and its influence on irrigation-induced loess flowslides

引用

Journal of Mountain Science 2022年第10期19卷 2935-2951页

作者： JIAN Tao KONG Ling-wei BAI Wei LIU Bing-heng SUN Zhi-liang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China

The loess tableland provides an excellent site for people to live and ***,flowslides occur frequently on the slope of loess tablelands due to agriculture irrigation,resulting in serious economic losses and *** structure degradation effect of irrigation water seepage on intact loess leads to a weakening of its mechanical properties,which may be responsible for the recurrent occurrence of flowslides in irrigated loess *** this paper,seepage tests and triaxial tests were carried out to investigate the evolution of the microstructure and undrained shear properties of intact loess during *** results show that water seepage leads to a significant decrease in pore water ion concentration and migration of fine particles with water flow,but no noticeably change in mineral *** seepage,the metastable structure of intact loess collapses,the fine particles disperse around the skeleton particle to fill the pores,and the total porosity *** permeability coefficient gradually decreases with seepage time and then tends to a *** saturated intact loess shows strongly contractive behavior during undrained shear and has considerable liquefaction *** seepage,the intact loess is characterized by more rapid build-up of pore water pressure and more intense strain-softening during shearing and has lower shear strength(including peak strength and steady-state strength).In irrigated loess tablelands,long-term seepage could weaken the shear strength of intact loess and increases its liquefaction potential,which contributes to the initiation of loess flowslide failure and the movement with high-speeds and long run-outs.

关键词： Intact loess Long-term seepage Undrained shear behavior Static liquefaction flowslides

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