Experimental Study On Creep Characteristics Of Xigeda’clay Rock And Its Slope Creep Analysis

This paper, taking a slope in industrial park of Sichuan Jiang Tong as the research object,based on the wild field geology survey,using the direct shear creep apparatus improved by ourself in the laboratory, in the load is 150 kpa, 250 kpa 350 kpa and 450 kpa,using the method of hierarchical load on the slope of creep characteristics to study.Using the Boltzmann linear superposition principle to transformed the test curve to the form of load respectively,then the isochronous curve of Xigeda clay rock can get.Using Burgers model fitting experimental data,then received Xigeda clay rock creep test parameters.At the same time,combined with Xigeda’s long-term failure criteria of clay rock,received the exponential relationship between the long-term strength of the equation of the slope.Based on the clay rock long-term strength parameters in different time,under the condition of comprehensive analysis of the stress and strain and stability of the slope.In this paper, the main achievements are as follows:(1) Using the method of hierarchical load on the slope of creep characteristics to study.Then using the Boltzmann linear superposition principle to transformed the test curve to the form of load respectively,obtained shear strain time curve of the various vertical stress.(2)On the basis of the creep curve,obtained the shear stress and shear strain Isochronous curve of Sichuan Jiangtong industrial park Xigeda of clay rock slope.The shear stress and shear strain Isochronous curve of the clay rock creep is nonlinear,is usually a set of curves, rather than a straight line. When such as graph can be seen on the obvious turning point, the isochronous curve slope have obvious changes,and after that point is the turning point of curve of the yield stress points.(3)Burgers model is adopted,and through the test of creep curve and the isochronous curve analysis,got the clay rock creep test parameters of Xigeda,and analyzed the the clay rock creep test parameters of Xigeda.(4)Based on the creep model,and combined the long time soil failure criteria, established the long-term strength of the equation in this paper can better describe clay rock creep characteristics.And using the long-term strength equation, analysed the rule of shearing strength reduced, at the same time confirmed clay rock ultimate strength for the long term.(5) Through to processing the test data, got the clay rock strength equation for a long time in different time of the long-term strength parameters, using FLAC to anslysis stress strain and displacement of the slope.