Experimental Study On Creep Characteristics Of Anchorage System And Numerical Simulation

Geo-technical anchorage has become an important branch of geotechnical engineering field, and the vitality of geotechnical anchorage is that it can give full play to the inherent power of the geotechnical materials. Understanding the creep characteristic of anchorage system is one of the keys of the geotechnical anchoring technique, because the system rheology largely determine the long-term stability and security of the engineering.In this paper, the creep characteristic of anchorage system are studied through the method of the indoor experiment study and the numerical simulation. And the main content of the research are as follows:(1) Indoor test of anchorage system was independent designed, and the design, production and maintenance of the samples were designed independently too.(2) Based on the improved RYL- 600 rock triaxial creep testing machine, the indoor test of the creep characteristic of anchorage system was carried out, and the law that the displacement of anchored body and the strain on the anchorage interface change with time under rating load was obtained. By analyzing test data, the viscoelastic and plastic characteristics of the creep of the anchor solid and anchorage interface are further discussed.(3) Based on the test results of creep property of anchorage system, using the creep model Cvisc in FLAC3 D which can reflect the characteristics of the viscoelastic and plastic of the anchoring system in an all-round way to carry out the numerical test which is under the same condition with the indoor test. By comparing the numerical results and laboratory test results, the similarities and differences of the creep on the anchorage body and on all the monitors of anchorage interface between the numerical simulation and indoor test were further illustrated.(4) The numerical simulation research are carried out with the same conditions of indoor creep tests for the different anchor solid length, diameter,strength and different load levels of numerical mode respectively. Discussing the sensitivity of the listed influencing factors on the creep characteristics, the paper provides the reasonable comments and suggestions on the influence of the parameter change for the creep property in such indoor creep test and numerical test.