Seepage-creep constitutive model and experimental verification of grouted rock mass considering macro-meso coupling damage effect
The existence of creep effects in hydraulic engineering has led to frequent occurrences of disasters during the operation of projects,resulting in serious losses,thus becoming one of the main factors affecting the long-term stability of hydraulic engineering.In order to effectively deal with potential engineering disasters,grouting technology is widely applied to extend the service life of hydraulic engineering.In this research,based on the concept of macro-micro defect coupling,a seepage-creep constitutive model of the rock mass reinforced by grouting was established.Subsequently,seepage-creep tests were conducted using the ROCK multi-field coupling test system,revealing the influence of different grouting materials on the reinforcement characteristics of fractured rock masses,and validating the established seepage-creep constitutive model.The research results indicate that the established macro-micro cou-pling damage creep model can comprehensively consider the influence of factors such as fracture geometric parameters,mechanical parameters,and grouting reinforcement effects on creep.Meanwhile,the new constitutive model dynamically considers the changes in mechanical parameters and the influence of permeating water pressure during the seepage-creep process,exhibiting significant advantages over the traditional Xiyuan model.The experiments obtained the change laws of creep characteristics and permeability performance of rock masses reinforced with PO42.5 concrete containing polypropylene fibers and silica sol,simultaneously proving the accuracy and effectiveness of the seepage-creep constitutive model.These research findings provide a theoretical basis for the design of grouting reinforcement in hydraulic engineering.
creep modelseepage-stress couplinggrouting rock massdamage constitutive model
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