怒江机场高填方挡墙边坡稳定性分析

Stability Analysis of High Fill Retaining Wall Slope in Nujiang Airport

怒江机场地处西南高烈度地震山区,该机场建设采用高填方边坡形式,边坡在高填方荷载及地震荷载作用下的稳定性是制约机场建设的关键因素。采用理论分析及数值模拟方法对挡墙高填方边坡的稳定性进行分析,结果表明,高填方荷载下,挡墙基底大部分区域地基承载力不满足要求,挡墙差异沉降大;填土界面综合抗剪强度参数需满足c≥50kPa,φ≥25°时才能确保回填土体稳定;地震作用对回填土应力和变形影响较大,挡墙变形增加0.6~1.1mm,可能引起挡墙开裂。建议对基底岩体进行加固,并对挡墙进行抗震设计。

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.