南京某机场软土地基沉降预测及应用

Settlement Prediction and Application of Soft Soil Foundation in a Nanjing Airport

规范法计算地基沉降变形通常是在分层总和法的基础上乘以沉降修正系数,其建议的修正系数为范围值,取值范围依据基底附加应力和变形计算深度范围内压缩模量当量值。然而,该方法不适用于机场大面积填土,目前机场软土地基沉降修正系数取值一般根据经验,具有较大的随意性。该文依托南京某机场扩建工程,根据沉降观测资料,利用双曲线法预测了地基最终总沉降量;对比分层总和法计算的地基沉降量,反演推算出了沉降修正系数,对类似工程具有参考价值。

To calculate the foundation settlement deformation, the specification-based approach usually multiples the settlement correction factor by the calculation result of the layer-wise summation method, the suggested correction factor is a range value, and the range is based on the quantity value of the compression modulus within the additional contact stress and the calculated deformation depth. However, this method is not applicable to the large filling of airport. At present, the settlement correction factor value of the soft soil foundation of the airport is generally based on experience, quite random. Based on the extension project of an airport in Nanjing, and combined with the monitoring data on settlement, this paper predicts the final total settlement amount of the foundation with the hyperbola method, and deduces the settlement correction factor by comparing the settlement amount calculated with the layer-wise summation method, providing some references for similar projects.