Analysis of Rock Creep Patterns Based on Octahedral Strength Theory

Abstract Creep effects in rock engineering have long been the focus of attention and key research contents for civil engineers at home and abroad. In this manuscript, the Dadu River Crossing Bridge Chengdu bank engineering slope in southwest China was taken to be the research object. In this slope, the high geostress and tectonic stresses caused the rock layers to crush each other, thus forming crushed rock. Which may undergo creeping deformation under long-term loads. Firstly, in this manuscript, the creep patterns of rock mass under different stress states (Ratio of rock stress to rock strength) was summarized based on the octahedral strength theory. Secondly, an accurate calculation of the rock mass strength parameters (uniaxial compressive strength) was realised based on the Hoek-Brown strength criterion. Thirdly, synthesized the theoretical study of the rock mass creep patterns and the calculation method of rock mass strength parameters, and then combined it with numerical analysis, an analytical model for rock mass creep patterns at different burial depths was established. Finally, the model was used to evaluate the rock mass creep behaviour of the research object at different depths of burial. The research results can provide a reference for the creep analysis of crushed rock and provide a basis for the safe construction of engineering slopes.