Creep analysis of rocky slope

Abstract

Rock creep is one of the important causes of slope instability. For projects with a long service life, the long-term stability analysis is required in addition to the stability during construction. Based on the foundation pit of a Yangtze River Bridge in Chongqing, the numerical simulation of the foundation pit slope is carried out using the finite difference program FLAC with the Cvsic model to analyze the deformation creep characteristics. First, the stress and strain at the foot of the slope after slope excavation is calculated, the creep analysis of the horizontal and vertical displacements at different positions on the slope within 10 years is performed, and then the horizontal and vertical displacements of the slope after 10-year use of anchor supports are calculated, with the creep characteristics of the axial force of the anchor also considered. The results show that the horizontal stress at the foot of the slope tends to decrease after 10 years. The shear stress and vertical stress are gradually stabilized. The horizontal displacement near the foot of the slope increases slowly after 2 years. The horizontal displacement at other locations basically tends to be stable after 2 years, and the horizontal displacement mainly occurs in soft rocks. The vertical displacements of each point on the slope surface are small and tend to be stable in the second year. After the anchor support is added, the horizontal displacement of the slope is significantly reduced. The anchor rod plays a larger role near the slope foot.