Abstract：Based on the theory of similar simulation and uniaxial compression strength on different specimens,six large-scale specimens of 150 mm × 150 mm × 150 mm were divided into three groups,which were made from different ratios of sand-gypsum-whitepowder or sand-paraffin,and uniaxial compression experiment was operated on RMT-150 B test system of rock mechanics. The results showed that: the axial strain was small for a lower strength sand-gypsum-whitepowder specimen in compression phase,elastic phase,yield phase; the scope for top strength change was larger; residual strength decreased slowly,and axial strain was large with rock body being failure; and a reserve arch or a platy fracture appeared along the specimen axis. The compression phase,elastic phase,yield phase,and failure phase were obvious in sand-paraffin specimens,and top and residual strength were stable. With the increase of cementation degree in the sand-paraffin specimen,the top and residual strength increased as well,but the weak degree decreased,diagonal shear failure appeared along the specimen axis,and the residual strength reduced quickly following rock-body failure,and the strength parameters tend to being stable,and the homogeneity was well.

Keyword：similar material;uniaxial compression;strength characteristics;failure morphology;homogeneity;