花岗岩残积土抗剪强度与微观结构特征OACSTPCD

The triaxial test and electron microscopy scanning test are conducted on the granite residual soil sample with different water mass fractions(water content)and different compaction degrees.The relationship between the shear strength characteristic and the microscopic pore structure of the soil samples are explored,and the shear strength attenuation mechanism of the granite residual soil is revealed from microscopic view.The experiment results show that the stress-strain curves of the granite residual soil sample have the strain hardening characteristic.The shear strength decreases with the increase of water content and increases with the increase of compaction degree.Under the low confining pressure stress,the granite residual soil samples are more sensitive to the water content and the compaction degree.From microscopic view,the proportion of mesopores and macropores in granite residual soil samples increases with increasing water content and decrea-ses with increasing compaction degree.