非接触式GB-InSAR技术用于深基坑应急监测的可行性探讨

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。

Discussion on Emergency Monitoring of Deep Foundation Pit based on Non-Contact GB-InSAR Technique

This paper presents to make emergency monitoring of deep foundation pit using the GB-InSAR technique. First, imaging and interferogram are evaluated for the acquired data by GB-InSAR technique to validate the effects of erected steel constructions. Second, the atmospheric effects are eliminated by two triangular re ectors to improve the measuring accuracy by GB-InSAR technique. At last, accuracy comparison is made for the six check points between the GB-InSAR technique and electric total station with a prism. The results show that GB-InSAR technique is more accurate and convenient to make emergency monitoring of deep foundation pit. Displacement maps of the whole monitoring area can also be obtained for each observation sampling interval. Conclusions drawn from the experiment can be helpful in emergency monitoring for deep foundation pit using GB-InSAR technique.