Research on frozen geotechnical material is focused on guaranteeing the security of civil engineering and preventing of geological hazards in cold regions.The acoustic emission(AE)tests of the ice,ice-rock mixture,frozen soil,and frozen soil-rock mixture samples were carried out under Brazilian splitting conditions.The characteristics of crack evolution,acoustic emission energy and,b-value were discussed.The results show that:(1)The cracks in the ice-rock mixture and frozen soil-rock mixture are more tortuous than those in ice and frozen soil.(2)The crack in the ice-rock mixture is mainly distributed inside the ice near the ice-rock interface.Moreover,the tensile strength and acoustic emission energy of the ice-rock mixture are larger than that of ice.(3)The crack of frozen soil-rock mixture is composed of frozen soil crack and soil-rock interface crack.The frozen soil-rock interface is the weakest part inside the frozen soil-rock mixture,which leads to the acoustic emission energy of the frozen soil-rock mixture is smaller than that of frozen soil.(4)The acoustic emission energy peak of ice and ice-rock mixture being consistent with the leading peak and shows an obvious single peak pattern.Nevertheless,in the case of frozen soil and frozen soil-rock mixture,the acoustic emission energy peak lags behind the loading peak and display a multi-peak feature.(5)The b-values of all the samples decrease with the increasing loading in the pre-peak region,and then show an increasing trend with the decreasing loading in the post-peak region.Furthermore,the amplitude of the b-value of frozen soil-rock mixture is larger than that of others.It can be postulated that the alternating crack growth of soil and interface cracks triggers the different acoustic emission energy.
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