This paper is presented to discuss emphatically the characteristics of compressive deformation of marble under the three-dimentional stress states and the researches of the influences on stress-strain relationship

strength

and failure mechanism by different loading paths. The tests that have been conducted included the constant confining pressure repeated loading

constant stresses

equal proportional loading or ynloading

the hydrostatic and uniaxial tests. The Model CBS-2 digital displacement apparatus manufacfured by our institute was used for measurement in these tests. The probes were directly fixed between the top and bottom fillers of specimen in a high pressure cylinder . It could be used to measure the deformation of specimen after failure

consequently there has a sufficient range for measuring deformation than that of electric strain gauge. The stress-strain relationships for different loading paths are given

and the author proposed some opinions to these problems.