In order to investigate the rheological properties of hornblende plagioclase gneiss in Xiaowan Hydropower Project

triaxial compression rheological experiments for hornblende plagioclase gneiss spceimens are carried out on the rock servo-controlling rheology testing machine. The rheology testing results show that rheological properties of hornblende plagioclase gneiss is very obvious. Based on the triaxial rheological experimental results

the variance law of axial strains of hornblende plagioclase gneiss specimens with the time under different pressures is investigated; and the development trends and characteristics of rock deformation in stage of accelerated rheology are discussed. At the same time

the scanning electron microscopy experiments of rheological rupture fracture are carried out; the rupture forms and mechanisms are analyzed. Based on the relation between creep rate and stress level in the stage of steady-state creep

a new method is put forward to determine long-term strength. Combining statistical damage model and Burgers rheological model

the corresponding damage rheological model is proposed; and then rock statistical damage rheological model is verified by accelerated rheological test curves of rock spceimen. The results show that the rock statistical damage nonlinear rheological model agrees well with the rheology test results

and can exactly describe the rheological properties of hornblende plagioclase gneiss in Xiaowan Hydropower Project.