Acoustic experimental study of two types of rock from the Tibetan Plateau under the condition of freeze-thaw cycles

查看全文 作　　者：Hua Liu FuJun Niu ZhiYing Xu ZhanJu Lin Jian [1]Xu

机构地区：[1]State Key Laboratory of Frozen Soil Engineering, CoM and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China

出　　处：《Research in Cold and Arid Regions》索引2012年第4卷第1期,共7页

基　　金：supported in part by the Important Orientation Projects of the CAS (KZCX2-YW-Q03-04);the Grant of the Western Project Program of the Chinese Academy of Sciences (KZCX2-XB2-10);Natural Science Foundation of China (Grant No. 40625004,40821001) 摘　　要：Under the condition of freeze-thaw cycles,two types of rocks(granite and andesite),used as slope protection for the Qinghai-Tibet Railway,were tested according to the special climatic conditions in the Tibetan Plateau,and their various damage processes in appearance were carefully observed.Observation results show that damage of andesite was more serious than that of granite.Using an acoustic instrument,ultrasonic velocity was tested.The changing trends of velocity with the number of freeze-thaw cycles were analyzed,and the freeze-thaw cycle damaging the physical and mechanical properties of rocks can be seen.According to the changing trends of ultrasonic velocity with the number of freeze-thaw cycles,mechanical parameters of rocks,such as dynamic elasticity modulus,Poisson's ratio,and dynamic bulk modulus were analyzed.It is found that they all have declining trends as the number of freeze-thaw cycles increases,and in particular,when the cycle number reaches a certain extent,the Poisson's ratio of rocks begins to become negative. 关键词：冻融循环青藏高原岩石声学实验类型超声波速度动态弹性模量体积弹性模量

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Acoustic experimental study of two types of rock from the Tibetan Plateau under the condition of freeze-thaw cycles

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