上海浦东机场一跑道地基沉降规律

目前,软土地基沉降计算理论尚不完善,计算精度还较低。上海浦东机场一跑道地基为典型的软土地基,从道面竣工开始就进行了道面沉降观测,已积累了11a的沉降观测资料。这些资料对于认识软土地基沉降变形规律具有重要意义。本文通过对上海浦东机场一跑道道面沉降观测资料的分析,论证了一跑道地基沉降变形规律、建立了地基沉降模型。一跑道地基沉降以静载沉降为主,同时,飞机动载沉降、水位变动沉降也不可忽视。飞机动载沉降可以从跑道横断面实测沉降资料中分离出来,动载沉降多发生在通航2～3a内,之后,动载沉降增加缓慢。与飞机动载沉降相比,地下水位下降引起的地基沉降更大。不同时间,地基沉降组成不同,截止2009年4月,一跑道中心线附近地基平均沉降约为54cm,其中,静载沉降约为33cm、动载沉降约为5cm、地下水位下降引起的地基沉降约为16cm。

SUBGRADE SETTLEMENT RULES OF FIRST RUNWAY OF PUDONG AIRPORT IN SHANGHAI

At present,the calculation theories for soft soil subgrade are not still perfect.The subgrade of the first runway in PUDONG AIRPORT is built on a typical soft soil area in Shanghai.Its pavement settlement has been measured for 11 years.This paper analyzes the measured pavement settlement data and finds the rules of runway subgrade settlement.The foundation settlement model is also put up.The subgrade settlement of the first runway is mainly induced by static loading.Meanwhile,the moving aircraft loading and groundwater withdraw cannot be ignored also.The calculation method and the rules of settlement induced by moving aircraft loading are put forward.The most of the subgrade settlement induced by moving aircraft loading is produced in the two or three years after the runway was commissioned.Compared with the moving aircraft loading,the groundwater withdraw can produce more subgrade settlement.In different time,the subgrade settlement constitutes differently.By the April of 2009,the subgrade settlement of the first runway was about 54cm.About 33cm of the settlementwas induced by static loading, 5cm was induced by the moving aircraft loading,and 16cm was induced by groundwater withdraw.