Damage Failure Energy Evolution Mechanism of Jointed Sandstone Treaded with Dry-Wet Cycling Action under Triaxial Compression
Zhang Liang
Wang Guilin
Ren Jianxi
Sun Fan
Wang Runqiu
Liu Bolong
Abstract：In order to explore the energy dissipation mechanism of damage and failure of jointed sandstone under dry-wet cycling conditions,the triaxial compression test and rock energy dissipation theory were adopted to study the energy conversion law and the energy-driven mechanism during the deformation and failure process.The results show that the input energy U1 from the axial pressure and the elastic strain energy Ue decrease gradually with the increase of cycles of dry-wet cycling.Specifically,the logarithmic and the linear trends were observed for the intact rock sample and the jointed rock sample,respectively.According to the evolution law of dissipated energy,the energy damage process of jointed sandstone under the loading is divided into five stages:initial damage,stable damage,stationary damage,accelerated damage and damage failure according to evolution law of dissipated energy during the process of deformation.In addition,with the increase of confining pressure,U1 and Ue at the peak point increase linearly,the strain energy U3 done by confining pressure and the energy U0 absorbed by hydrostatic pressure decrease and increase linearly,respectively.The dry-wet cycling will reduce the minimum activation energy of microcrack propagation,weakening the elastic strain energy stored in the rock.This is the essential reason for the strength weakening of jointed sandstone under dry-wet cycling.
Keywords：dry-wet cyclingjointed sandstoneenergy evolutiontriaxial compressionelastic strain energyengineering geology
Publication Date：2025-01-14
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：17( 269-285 )