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Research on the creep energy evolution law and damage model of deep sandstone with microporous defects
Engineering Geology ( IF 6.9 ) Pub Date : 2024-06-15 , DOI: 10.1016/j.enggeo.2024.107601 Dongxu Chen , Laigui Wang , Shanyong Wang , Chuang Sun , Yunhe Ao , Jiamin Wang
Engineering Geology ( IF 6.9 ) Pub Date : 2024-06-15 , DOI: 10.1016/j.enggeo.2024.107601 Dongxu Chen , Laigui Wang , Shanyong Wang , Chuang Sun , Yunhe Ao , Jiamin Wang
Pore defects in rocks represent a significant factor contributing to creep hazards in rock engineering. To investigate the sensitivity of rock creep characteristics to porosity, prefabricated pore tests and creep tests were conducted on red sandstone obtained from the Yuezhi Mountain Tunnel in Sichuan Province, China. The energy theory and the developed Clumps with random geometry (CRG) model were used to characterize the rock damage during creep loading. The results show that the percolation erosion test effectively alters the porosity of the rock and make the pores uniformly distributed in the rock. There is a significant disparity in the creep characteristics of sandstones with varying porosities, particularly noticeable in the stable creep rate and accelerated creep initiation time. Moreover, the increase in porosity leads to a higher proportion of shear cracks and an accelerated energy dissipation rate during the rock creep process. Drawing upon the findings from the tests and simulations, a porosified Nishihara creep damage constitutive model is put forward. Analysis reveals that the deformation parameters of the creep constitutive model decrease progressively with rising porosity, whereas the damage parameters exhibit a contrasting trend.
更新日期：2024-06-15
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