|
Abstract The creeping problems of argillaceous slate in the construction period of Yaojia Tunnel at Changsha—Kunming(Hunan) Section of Shanghai—Kunming Passenger Railway Line were investigated. The influence of stress state and rate of water absorption on the creeping properties of argillaceous slate were analyzed with the creeping tests under triaxial compression. A water degradation factor was introduced based on the Burgers constitutive model of creeping and a visco-elasto-plastic constitutive equation for creeping considering the rate of water absorption of argillaceous slate was established. The rationality of constitutive equation for creeping was verified with the software ANSYS using prony series transformation. With the increase of the rate of water absorption，the creeping deformation and creeping rate of argillaceous slate were increased and the process of entering the constant rate and accelerated creeping stages were speeded up. The increasing of stress difference meant that the process of entering the constant rate and accelerated creeping stages were speeded up and the time length was shortened. With the increase of water absorption rate，the creeping parameters(deformation modulus，viscosity coefficient，bulk modulus) decreased exponentially. The constitutive model for creeping considering the water degradation factor was planted into ANSYS. The numerical calculated results fit the experimental results of creeping test.
|
|
|
|
|
|
2015, Vol. 34 
