用GPS监测杭州湾跨海大桥沉降的可行性分析

Feasibility analysis of monitoring Hangzhou bay bridge subsidence by GPS surveying

杭州湾跨海大桥建成通车后,原有的利用水准测量进行沉降监测的方式遇到了很大困难。针对这种情况,本文从理论上推导了使用GPS静态测量代替水准测量进行沉降监测带来的差别,并通过数值分析证明了对于杭州湾跨海大桥这种差别在1mm以内。最后对两者的实际测量精度情况进行了分析,得出两者在杭州湾跨海大桥沉降监测中测量精度相当。

When Hangzhou Bay Bridge opened to the public, the primary subsidence monitoring of the use of Leveling encoun- tered great difficulties. In view of this situation, this paper analyzed the difference between GPS static measurement and leveling in subsidence monitoring in theory, and demonstrated that the difference would be less than 1 mm by numerical analysis. Finally it ana- lyzed the real precisions of the two ways, and obtained that GPS static measurements is equivalent to the Leveling.