To investigate the porosity and seepage characteristics of cementitious materials under the coupled action of seepage-chemical dissolution,a mathematical model of seepage-dissolution was established.Then the process of chemical dissolution,calcium ion migration,and seepage interacting with each other was investigated by using the method of finite element simulation and experimental verification.The applicability of the seepage-solution model under acid erosion condi-tions was examined by numerical simulation of the changing rules of porosity and permeability rate under different pres-sure heads and different acid concentrations.The soil was eroded by chemical soaking method,and the permeability and porosity of the eroded soil were measured.The both of nonlinear curves were fitted to verify the rationality of numerical simulation.The results show that the change of water head does not affect the trend of porosity and permeability rate of cementitious materials;The relationship between permeability rate and porosity is an approximate cubic function;The e-rosion solution accelerates the dissolution of calcium ions in cementitious materials,which in turn accelerates the change of porosity and permeability rate.
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