通过运用FLAC^3D作为基本的数值模拟分析工具，选取对九寨黄龙机场影响最大的元山子沟高填方工程作为主要研究对象，模拟实际施工过程，对高填方地基的沉降进行了定量分析和评价。分析结果表明，数值模拟结果与监测结果吻合很好。高填方地基沉降大，压缩快，差异沉降明显，沉降中心出现在坡肩部位(跑道西侧)，最大沉降值为2．8m，道槽区和坡脚部位沉降逐渐减小。高填方地基的沉降与填筑体的厚度和原地基中软弱土层的厚度有着密切的关系，即最大沉降量往往出现在填体厚度较大或填体厚度和原地基软弱土层厚度均较大的部位。

Jiuzai-Huanglong airport is located on the eastward slope of Zhangla basin in Songpan County in the northwest of Sichuan. By using FLAC3D program to simulate real construction process. the settlement of the high fill foundation especially differential settlement, which has the most powerful influence on Jiuzai-Huanglong airport is quantitatively analyzed and evaluated. The results indicate: (1) The calculation results coincide with the monitoring results. (2) The settlement center lies in the place of slope shoulder with the maximum settlement amounting to 2.8 m; and the settlement gradually decreases on the runway and the base of slope. (3) The total after-construction settlements have close relations with thickness of the fill and soft layer, i.e. the bigger settlement often presents at the places with thicker fill or thicker fill and soft layer.