Constitutive equations and mechanical features of volcanic rock formation in Xujiaweizi of Daqing were studied in this paper.Based on acoustic logging data and core data
a mathematic model for describing the relationship between them was established by regression analysis and experiments.Moreover
volcanic elastic and plastic constitutive equation were built up according to the theory of damage mechanics.The results show that volcanic rock in this area has obvious brittle and elastic feature with higher drillability grade
higher hardness
low plastic coefficient and Poisson’s ratio.In addition
this equation can successfully reflect the change of rock formation.