Mechanical Properties and Failure Characteristics of Granite Intersected with Single Fractures Under Uniaxial Compression
To investigate the mechanical properties and failure characteristics of granite intersected with single fractures,uniaxial compression tests were carried out on intact granite and granite intersected with fractures at inclined angles of 30°,45°,and 60°,which were selected from the Beishan area for geological disposal of highly radioactive waste in Gansu Province of China.The results show that as the inclined angle of the fracture increases,the uniaxial compressive strength,damage stress,and elastic modulus of the specimens decrease.Compared with intact granite,the uniaxial compressive strength of fractured granite at inclined angles of 30°,45°,and 60° decrease by 7.97%,29.17%,and 71.68%,respectively,while the damage stress decreases by 9.35%,24.26%,and 69.79%,respectively.In addition,the elastic modulus of the specimens decreases by 5.89%,23.32%,and 60.49%,respectively.The stress-strain curves of the specimens show significant differences when the inclined angles of the fractures are different.The larger inclined angle of the fractures indicates a more obvious yield stage between the damage stress and the peak stress,representing more obvious slip failure characteristics along the fracture surface.The inclined angle of the fractures influences the failure mode of granite.The failure modes of the specimens can be divided into three types:failure with fractures intersecting the fracture surface(inclined angle of 30°),slip failure along the fracture surface(inclined angle of 60°),and the compound failure of the first two forms(inclined angle of 45°).Furthermore,the compressive strength of fractured granite at a inclined angle of 60°shows a power function growth relationship with the difference in fractal dimension of the fracture surface before and after the test.
rock mechanicsgranite intersected with single fracturesinclined angle of fracturesuniaxial compression testfailure characteristics
万方数据
维普
