Statistical Damage Model of Rock Based on Compaction Stage and Post-Peak Shape under Chemical-Freezing-Thawing-Loading

The deterioration of rock mechanical properties under chemical-freezing-thawing-loading will seriously threaten the stability and safety engineering mass, so study its constitutive model has very important theoretical application significance. In view deficiency that existing statistical damage cannot describe nonlinear characteristics compaction stage post-peak shape, index is introduced to measure stress-strain caused by iso-compression pores in rock, correction coefficient optimize shape loading. Assuming strength failure microunits obey Weibull distribution, on basis using Drucker-Prager criterion microunits, a for considering established. Finally, it compared with test curve. results show calculation curve established same trend as uniaxial compression Furthermore, can better law different chemical solutions freeze-thaw cycles, which fully reflects rationality accuracy constructed model. research provide deformation rocks chemical-freezing-thawing-loading.