Variation of granite fracture aperture under thermal-hydro-mechanical coupling condition
Geological site selection and foundation analysis are crucial for the construction of underground space engineering.Taking granite from the Zhoushan area of Zhejiang Province as a sample,the numerical simulation analysis was conducted based on geological survey.The fracture aperture distribution problem was calculated by using a granite sample under the complex environmental conditions.The results indicate that the granite fracture aperture shows a rapid increase with time under the coupled thermal-hydro condi-tion and then tends to stabilize;the thermal strain increases significantly at a distance of 20 mm from the fracture entrance and the range of the thermal strain is in the order of 10-5;under the thermal-hydro-me-chanical coupling condition,the deformation degree of the granite fracture at 5 MPa is higher than that at 3 MPa,and the fracture aperture is significantly affected by this coupling condition.The fracture aperture is continuously decreasing when the confining pressure is increased.Moreover,the decrease of the fracture ap-erture results in the decrease of the permeability in the internal rock fracture.The results provide a scientif-ic basic for the stability study of the fractured rock masses.
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