Study on Accelerated Creep Properties and Creep Damage Constitutive Relation for Volcanic Breccias

摘要

In order to know about the accelerated creep properties of volcanic breccias,triaxial compression rheological experiments are carried out on rock servocontrolled triaxial rheology equipment.Based on the experimental results,theaccelerated creep phase of creep curve of volcanic breccias is analyzed.It is shown that the strain rate increases sharply,the rock damage rapidly increases; the acoustic emission dramatic increases with the increase of time during the stage of accelerated creep,and the accelerated growth of rock damage leads to the sharp increase of creep rate.Then based on the accelerated creep deformation,the relation of damage variable versus time is obtained,and and the creep damage constitutive equation of volcanic breccias is established.It is shown that the established nonlinear creep damage models based on time function is correct and reasonable.