Influence of Porosity on Mechanical Properties and Energy Dissipation of Rocknumerical Simulation
Abaqus is used to simulate the triaxial compression test of rock,and python programming script is used to realize the random deletion of elements,so as to obtain the loading model with different porosity.Numerical simulation is carried out based on the rock mechanical parame-ters obtained from the actual triaxial compression test data,and the mechanical properties and energy dissipation evolution law of rock during the loading process are analyzed.The results show that:(1)with the increase of porosity,the elastic modulus,peak stress and their corresponding internal energy and elastic strain energy decrease linearly;(2)When the amount of pores in the rock is small,shear failure occurs,forming an obvious strain localization zone.After the peak stress,the stress of the rock decreases rapidly,showing brittle failure;For the rock with more pores,there are multiple strain localization zones during failure,and the rock becomes more broken.The stress after the peak strength decreases slowly,showing the characteristics of ductile failure.(3)With the increase of porosity,the internal energy and elastic strain energy gradually decrease.After reaching the peak stress,the internal energy and plastic dissipation energy increase steadily,the elastic strain energy is partially released,and the release amount and release rate decrease with the increase of rock porosity,and the severity of rock damage is weakened.(4)At the initial stage of loading,the rock produces elasticity.At this time,the plastic dissipation energy is close to zero.When the stress reaches a certain value,the plastic dissipation energy increases slowly,and increases rapidly near the peak stress until the rock is destroyed.
porosityriaxial compression of rockabaqusnumerical simulationstrain nephogram
国家科技期刊平台
NSTL
万方数据
维普
