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Dynamic response characteristics of dry and watersaturated schist under impact loading

Journal of Mountain Science 2020年第12期17卷 3123-3136页

作者： ZHOU Yang SU Sheng-rui CHEN Jian-xun School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710064China School of Highway Chang’an UniversityXi’an 710064China

Many geological engineering hazards are closely related to the dynamic mechanical properties of rock ***,most existing studies on the dynamic mechanical properties of rock materials were conducted on the hard rocks such as sandstone,granite,limestone,and marble,whereas soft rocks,such as schist,are less ***,in this study,a series of triaxial impact tests were conducted on dry and saturated schist by employing a modified triaxial split hopkinson pressure bar system to reveal the coupling effects of water,strain rate,and triaxial confining pressure on the mechanical properties of *** results show that schist is a type of watersensitive rock and the stress-strain curve of saturated schist has apparent *** effects of strain rate on dynamic strain,deformation modulus and peak stress were *** results also show that the dynamic peak stress is affected by the combined softening effect and viscous effect of water under impact ***,it was found that the failure mode of schist belongs to typical axial tensile failure under uniaxial impact tests,and shear failure is the main failure mode under triaxial impact *** the increase in confining pressure,the failure modes of schist change from tensile failure to shear *** research can provide useful parameters for geological engineering hazard prevention in mountain areas.

关键词： Dry and water-saturated schist triaxial stress constraint modified triaxial split hopkinson pressure bar Dynamic mechanical behavior Impact loading

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