Title :
Theoretical and experimental study on equivalent nonlinear Burgers model for soften rockmass
Author :
Zhu, Jianghong ; Ji, Hongguang
Author_Institution :
Civil & Environ. Eng. Sch., Univ. of Sci. & Technol. Beijing, Beijing, China
Abstract :
The classic Burgers creep model only combined with several liner basic cells can hardly describe the accelerating creep stage of rock material, while the creep attribute of the weak rock is very remarkable. Based on creep damage and hardening mechanisms, the cell of Maxwell was replaced with a nonlinear softening spring, while the Kelvin was replaced with a nonlinear hardening damper, and the two cells were acted in series. An equivalent nonlinear Burgers creep model was built and the corresponding creep equations were deduced. In addition, an experimental study was conducted by collecting rock samples from practical engineering. According to the results, some programs were developed to deal with the test data and the model corresponding parameters were also fitted. Hereby, a theoretical creep curve was achieved and then compared with the creep testing curves. It was shown that the equivalent nonlinear Burgers creep model was felicitous to characterize the creep behavior law of the weak rock.
Keywords :
creep; damping; geotechnical engineering; rocks; softening; Burgers creep model; accelerating creep stage; equivalent nonlinear Burgers model; nonlinear hardening damper; nonlinear softening spring; rock material; soften rockmass; Creep; Educational institutions; Helium; Mathematical model; Rocks; Softening; Stability analysis; Burgers model; creep; damage mechanism; hardening mechanism; nonlinearity;
Conference_Titel :
Electric Technology and Civil Engineering (ICETCE), 2011 International Conference on
Conference_Location :
Lushan
Print_ISBN :
978-1-4577-0289-1
DOI :
10.1109/ICETCE.2011.5775267