深中通道碎石基础整平多波束测量技术

Multibeam measurement technology for gravel foundation leveling in Shenzhen-Zhongshan Link

为解决沉管隧道及相关水下大型结构物施工对测深精度远高于传统水深测量规范的相关要求问题,以深中通道碎石基础整平限差要求±40mm为例,分析了多波束测深系统的误差来源及理论测深精度,提出了削弱各误差项的方法,并结合实际工程进行了验证。通过对多次管节碎石基础的扫测结果表明,采用该套经优化处理的多波束测深系统能够满足该项目的高精度要求,提出的若干方法可为后续相关对测深精度要求较高的水下工程项目提供参考。

As a response to the high accuracy requirements for depth measurement in construction of immersed tube tunnel and related underwater large-scale structures,which far exceed the standards of traditional hydrographic surveys,this paper analyzes the sources of error and theoretical accuracy of multibeam depth measurement system taking the example of the±40mm leveling limit requirement for the gravel foundation of the Shenzhen-Zhongshan Link immersed tube tunnel.Furthermore,proposes numerous methods to reduce the various sources of error and validates it via engineering practices.The results of multiple surveys of gravel foundations show that the optimized multibeam depth measurement system can meet the high accuracy requirements of this project.The proposed methods can provide reference for subsequent underwater engineering projects with high accuracy requirements for depth measurement.