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针对深基坑应急监测的需求,本文提出采用非接触式GB-In SAR技术,对已经发生较大位移的深基坑进行应急监测。介绍了GBIn SAR技术的工作原理,提出了一套较为系统的监测方法,定量评价监测获取成像结果和干涉质量,采用设置角反射器为固定GCPs点的方法获取环境因素校正参数,消除湿度、温度、气压等环境因素造成大气折射的影响,提高监测的准确性。将基于GB-In SAR技术与全站仪监测的结果,进行对比分析验证其精度的可靠性,并进行深基坑稳定性分析,结果表明非接触式GB-In SAR技术,为深基坑快速、准确应急监测提供了一种新技术和新方法。
In response to the need of emergency monitoring of deep foundation pit, this paper proposes to use non-contact GB-In SAR technology to conduct emergency monitoring of deep foundation pit which has been subjected to large displacement. The working principle of GBIn SAR technology is introduced. A set of more systematic monitoring methods are proposed. Quantitative evaluation and monitoring are used to obtain the imaging results and the interference quality. The method of setting corner reflectors to fix GCPs points is used to obtain the correction parameters of environmental factors, and the humidity, temperature , Atmospheric pressure and other environmental factors caused by atmospheric refraction, improve the accuracy of monitoring. Based on the results of GB-In SAR and total station monitoring, the reliability of the proposed method is verified by comparison and the stability of deep foundation pit is analyzed. The results show that the non-contact GB-In SAR technology is suitable for deep excavation fast , Accurate emergency monitoring provides a new technology and new methods.