Study on Rheological Test of Jinping Greenschist Under Step Load

Abstract:

Rock rheology tests were carried out on greenschist specimens from auxiliary tunnel of Jinping II Hydropower Station by step loading method. Phenomenon of the tests and the specimen axial and lateral stress-strain relationship as well as the flow obtained using the Burgers model varying parameters were analyzed. The results show that all samples’ strain on axial is greater than the lateral, while the rheology on lateral is larger than the axial,then the rheology and strain show an inconsistency. The rheological behaviours of all levels increase with the increasing of every stress levels. The axial rheology and lateral rheology of each level take the similar percentage of the total strain value on axial and lateral. Instantaneous deformation elastic model at all levels of each specimen is increasing,which complies with the general laws of rock rheology tests.Obvious anisotropy exists both in axial and lateral direction, and the phenomenon on the lateral can be more rapid and sensitive to reflect the rheological properties caused by the stress changes. The rheological parameter can reflect the greenschist rheological law, and the Burges Model can be a better simulation of the uniaxially rheological properties of Jinping greenschist.