Study on creep constitutive model of Badong formation mudstone under triaxial creep test
WANG Yanchao1，2，YAN Echuan1，CONG Lu3，ZHANG Jun2，QIU Min4，SUN Zhijie2，
ZHANG Chuanchuan2，ZHANG Lei2
(1. Faculty of Engineering，China University of Geosciences(Wuhan)，Wuhan，Hubei 430074，China；2. Transportation Industry Key Laboratory of Highway Construction and Maintenance Technology in Loess Area，Shanxi Transportation Research Institute，
Taiyuan，Shanxi 030006，China；3. Department of Civil Engineering，Shanxi University，Taiyuan，Shanxi 030006，China；
4. National Enterprise Technology Center，CCC Second Harbour Engineering Co.，Ltd.，Wuhan，Hubei 430040，China)
Abstract：Many dipping translational rock slides occurred in purple mudstone of Badong formation of Triassic strata(T2b4) in western Hubei Province and eastern Chongqing City. In order to research the mechanism of these rock slides，a series of conventional triaxial tests and triaxial creep tests for mudstone from the strata were performed，and rock creep mechanical properties were obtained. By comparing the yield stresses from the conventional triaxial test and the long-term strength from triaxial creep test，an element with yield stress threshold switch and an element with long-term strength switch were proposed. The pattern of viscous coefficient could be fitted by the power function satisfactorily and a nonlinear Newtonian element was proposed. Finally，a new nonlinear constitutive creep model with eight elements was established. The experimental data at all stages of creep could be fitted by the new model very well and the model parameters were obtained successfully. At last，parameters sensitivity studies for the analytical solution of the proposed model was carried out and the results indicated that the parameters of nonlinear Newtonian element and creep threshold value could affect the creep time significantly.
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2019, Vol. 38 
