组合后验方差检验法在地铁隧道变形监测中的应用研究  

Application of Combination Variance of Unit Weight Test in Deformation Monitoring of Metro Tunnel

作　　者：陈喜凤[1] 黄腾[1] 刘岭[1] 韩易[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098

出　　处：《隧道建设》2013年第1期33-37,共5页Tunnel Construction

摘　　要：在狭长的地铁保护区隧道水平位移监测中,自由设站法表现出明显的优势,但前提是拥有稳定的已知基准点,否则将歪曲监测点坐标,无法得到隧道准确的变形信息。组合后验方差检验法是确定基准网中稳定基准点的一种简单有效的方法。以南京市某地铁保护区为例,验证该方法的可行性,分析若以网中发生变动的基准点为已知基准将会对监测点坐标及其点位精度产生的影响。结果表明,只有用稳定的基准点进行自由设站交会,才能准确反映隧道真实水平位移情况,并提高监测精度。The advantages of free station would not be obvious in horizontal displacement monitoring of narrow and long Metro tunnel unless there are known references, as a result, incorrect deformation data would be obtained. The combination variance of unit weight test is a simple and effective method for determination of stable reference points of reference network. The practicability of the mentioned method is verified, and the influence of known reference points on the monitoring coordinate and the point position precision are analyzed. The results show that the monitoring precision can be improved, and the horizontal displacement can be correctly reflected by using free station method based on stable reference points.

关 键 词：地铁隧道 变形监测 基准点 自由设站 组合后验方差检验法 稳定性 

分 类 号：U456.31[建筑科学—桥梁与隧道工程]