Stability Analysis of High Fill Retaining Wall Slope in Nujiang Airport

Nujiang airport is located in the high intensity seismic mountainous area in the southwest of China.The stability of the slope under the high fill load and seismic load is the key factor restricting the airport construction. The methods of theoretical analysis and numerical simulation were used to analyze the stability of the high filling slope. The results show that under the high filling load of the retaining wall, most of the base of the retaining wall does not meet the bearing capacity requirements, and the differential settlement of the retaining wall is large. The comprehensive shear strength parameters of the filling interface should meet c≥50 kPa and φ≥25° to ensure the stability of the backfill soil. The seismic action has a great impact on the stress and deformation of backfill soil, and the deformation of retaining wall increases by 0.6～1.1 mm, which may cause the cracking of retaining wall. It is suggested to strengthen the basement rock mass and carry out seismic design for the retaining wall.