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Mechanical and electrical properties of coarse-grained soilaffected by cyclic freeze-thaw in high cold regions

Journal of Central South University 2020年第3期27卷 853-866页

作者： QU Yong-long NI Wan-kui NIU Fu-jun MU Yan-hu CHEN Guo-liang LUO Jing College of Geological Engineering and Geomatics Chang’an UniversityXi’an 710064China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China School of Civil and Architecture Engineering Xi’an Technological UniversityXi’an 710021China China Gold Group Tibet Tyrone Mining Development Co. Ltd.Lhasa 850000China

To evaluate the geotechnical properties of coarse-grained soil affected by cyclic freeze-thaw,the electrical resistivity and mechanical tests are *** soil specimens are prepared under different water contents,dry densities and exposed to 0?20 freeze-thaw *** a result,the stress?strain behavior of the specimen(w=14.0%andρd=1.90 g/cm^3)changes from strain-hardening into strain-softening due to the freeze-thaw *** electrical resistivity of test specimen increases with the freeze-thaw cycles change,but the mechanical parameters(the unconfined compressive strength qu and the deformation modulus E)and brittleness index decrease considerably at the same *** of them tend to be stable after 7?9 ***,both the dry density and the water content have reciprocal effects on the freeze-thaw *** failure and pore characteristics of specimens affected by freeze-thaw cycles are discussed by using the image analysis ***,an exponential function equation is developed to assess the electrical resistivity of specimens affected by the cyclic *** relations between the mechanical parameters and the electrical resistivity of specimens are established to evaluate the geotechnical properties of the soil exposed to freeze-thaw actions through the corresponding electrical resistivity.

关键词： coarse-grained soil freeze-thaw cycle unconfined compressive strength electrical resistivity electrical resistivity model

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