Dynamic Stability Analysis of Slope Under the Impact Load of Large Diameter Punched Cast-in-Place Pile

To analyze the dynamic stability of slope under the impact load of large-diameter punched cast-in-place piles, three slope stability safety factors defined from different angles are introduced. Based on the basic principle of the strength reduction method, the safety factor of slope under static load and impact load is solved by finite element software, and the safety factor of different criteria is compared. The following conclusion is drawn: the strength reserve safety factor on a sliding surface is in line with the actual situation of the project with wide application. The safety factor that takes the inflection point of displacement and the penetration of the plastic zone as the criterion is similar and less than that taking the non-convergence of calculation as the criterion, and the calculation may still converge. Based on the time history analysis method of strength reduction, the acceleration time history curve generated by the construction vibration of the punched pile on the measured point of the slope toe is selected as the dynamic load. The relationship between the reduction factor of the shear resistance parameters of the slope rock and the displacement of the two control points of the slope toe and top are established. The dynamic stability safety factor of the slope under impact load is calculated to be 1.81, which is 5.2% less than that of the static stability safety factor of 1.91.