EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE MECHANISM OF FILL EMBANKMENT SLOPE DUE TO ENGINEERING LOAD

The fill embankment has good stability under natural conditions after compaction. However, during the early construction and later road operation, a large number of deformation and damage phenomena could occur due to multiple factors such as engineering load and dynamic load. Aiming at this problem, this paper takes a fill embankment slope as an example, and uses indoor physical simulation technology to study the deformation and failure mechanism of the slope induced by the engineering load. The results show that after the pile is continuously applied in the upper part, the internal stress conditions of the slope change, resulting in uneven settlement. The deformation and failure of the fill slope is mainly controlled by the concentration of the tensile stress at the top of the slope during the loading process and the concentration of the shear stress in the slope. The direction of the crack extends and gradually changes to the pressure in the lower part of the pile carrier. The shear-shaped belt is gradually penetrated and extended to the lower portion to cause overall deformation and destruction of the slope. The deformation mechanism has the following process:from internal stress redistribution to tension crack formation and expansion then to tensile cracks to form a sliding surface, finally overall sliding. The deformation is a typical creep-pull cracked landslide. This study can provide reference for similar projects.