Abstract:

Shear creep characteristics is one of the important factors of deformation and longterm stability of slope rock mass. By regression fitting insitu shear creep test data, a shear creep empirical equation of “hard brittle tatter” diabase dikes was obtained. Using the least square method, the fitting parameters of empirical equation was gained. A creep parameter numerical inversion method was presented, which could simulate in-situ shear creep test process and the distribution of rock stratum. Comparative analysis indicated that the fitting curve and numerical curve could both reflect the test curve well and the maximum error was only 8％. So, the shear creep empirical equations could effectively reveal the shear creep characteristics of dam zone rock mass, and the shear creep numerical model was also reasonable and reliable. The inversion analysis method could help to understand shear creep characteristics under different stress levels of diabasic dike at dam site of Dagangshan Hydropower Station. This method could also provide important technical parameters guarantee for stability analysis and design of slope in dam zone.

Key words: in-situ shear creep test, creep empirical equations, creep parameter numerical inversion, hard, brittle and tatter diabase dikes, regression fit