Abstract：The compressive modulus，which characterizes the deformation behaviors of loose rock blocks under confining constraint，is related with many factors，such as the pore ratio，rock strength and so on. Among them，the pore ratio is one of the most important factors. Through testing，the relationship between compressive modulus and pore ratio is revealed. The testing results show that the compressive modulus increases fast with the decrement of pore ratio. By regression analysis，the relationship between them can be described by either exponent or power function，both with very high correlation coefficient more than 0.9. The testing results indicate that the compressive modulus is approximately linearly related with rock strength within a certain rang of rock strength of 15～45 MPa and increases with rock strength. The further regression analysis suggests that both the slopes and the intercept of the regressive linear function are closely related to pore ratio. The regressive slope increment increases with the decrement of pore ratio and their relationship can be described by either the exponent function or the power function，both with very high correlation coefficient more than 0.9. The relationship between intercept and pore ratio can be described by the polynomial function with a correlation coefficient more than 0.9. At last，the relationship among compressive modulus，rock strength and pore ratio can be written as a uniform function. By comparing the two functions containing the parameter of pore ratio，obtained by two different ways with and without considering rock strength，a certain unification is found between the two functions.
