Experimental study on physical mechanics of freezing sandstone of Cretaceous Strata

In order to further understand the physical mechanics features of the freezing sandstone in Cretaceous Strata,the uniaxial compression tests of the saturate d medium sandstone and coarse sandstone under the different temperature status were conducted. With the analysis on the rock stress and strain status and the failure m ode,the experiment study was conducted on the uniaxial compressive strength and elastic modulus. The results showed that with the temperature dropped,the uniaxial com pressive strength and elastic modulus of the freezing Cretaceous rock would be increased obviously. The compaction section and plastic deformation section of the stress- strain curve would be more and more not obvious and the more clear elastic and fragility features would be appeared. The major failure mode of the rock samples was a sp lit failure and monoclinic shearing failure and the failure strength was relatively low. The uniaxial compressive strength values of the samples would continuously increased with the temperature reduced. Under the same temperature status,the uniaxial compressive strength of the medium sandstone would be obviously lower than the coarse sa ndstone. The Poisson Ratio would be reduced with the temperature reduced. Under the same temperature,the coarse sandstone would be lower than medium sandstone. T he rest results could provide the references to the design parameters of the freezing wall and mine shaft liner for the mine freezing shaft sinking.