测斜管偏转对监测成果的影响规律与修正方法

Influence law and correction method of inclinometer deflection on monitoring results

基坑工程监测中,深层水平位移作为最重要的项目,监测实施有明确的方向要求。测斜管的导槽方向与所需测量方向存在夹角时,会使监测成果数据偏小,不能及时发布预警信息,影响基坑的安全性判断。目前测斜管存在夹角的现象普遍存在却未能得到有效重视。通过理论结合试验的方法,提出了预防措施和夹角修正公式,并对六种角度试验数据进行分析,验证了修正公式的可靠性,得出了强代表性、弱代表性和无代表性三类夹角的处理方法,总结了深层水平位移项目的实施经验。

In the monitoring of foundation pit engineering,the deep horizontal displacement is the most important index,and the monitoring implementation has clear requirements.There is an angle between the direction of the guide groove of the inclined tube and the required measurement direction,which will make the monitoring result data smaller.It could not timely release the warning information,which will affect the safety judgment of the foundation pit.The phenomenon of inclinometer tube installation containing angle is widespread but has not been paid attention to effectively.Through the method of combining theory with experiment,the preventive measures and the angle correction formula were put forward.The reliability of the modified formula was verified by analyzing the test data of six angles.The processing methods of strong representation,weak representation and unrepresentative angle were obtained and summarized for the implementation experience of deep horizontal displacement project.