飞机荷载作用下温州机场超固结软粘土地基变形研究

根据温州机场扩建工程中堆载预压地基处理道面标高的控制数据，计算分析得出温州机场新跑道投入使用后软粘土地基的超固结比；基于飞机荷载的动力特性，计算得到温州机场新跑道软粘土地基在A380机型作用下附加应力的分布情况；选取1／4余弦波模拟飞机循环降落荷载，通过循环三轴试验对温州机场新跑道软粘土的变形特性进行了研究．结果表明：在新跑道投入使用后，运营初期飞机降落造成的地基工后沉降非常显著，应予以重点监测；此外，扩建工程中堆载预压地基处理能够显著减少飞机降落荷载所引起的工后沉降．同时，应用指数模型对试验得到的应变数据进行拟合分析，得到与OCR和循环次数相关的应变预测模型．经推演检验，此模型对温州机场新跑道土基沉降的长期预测有一定的指导作用．

Study of Deformations of Wenzhou Airport Over-consolidated Soft Clay Foundation under Cyclic Aircraft Loading

Based on pavement level control of Wenzhou airport extension project, the over-consolidation ratio （OCR） of the soft clay foundation has been concluded by calculation and analysis. The distribution of soft clay foundation additional stress under the effect of aircraft loads was calculated based on the dynamic characteris- tics of aircraft loading. A quarter cosine wave was selected to simulate cycle effect of aircraft loads. The de- formation behavior of the soft clay under aircraft loads was studied by cyclic triaxial tests. The results of the study show that. The significant foundation settlement caused by initial operation landing of plane should be key monitored, when the new runway was put into use; besides, surcharge preloading ground treatment of the extension project can significantly reduce foundation settlement caused by aircraft loads. Meanwhile, strain prediction model related to OCR and cycle times has been achieved, by using the index model to carry on fitting analysis for the test strain data. By deduction algorithm, it is proved that the model can play a cer- tain role in guiding prediction of long-term foundation settlement of Wenzhou airport new runway.