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

doi:10.3973/j.issn.1672-741X.2013.01.006

Tunnel Construction ›› 2013, Vol. 33 ›› Issue (1): 33-37.DOI: 10.3973/j.issn.1672-741X.2013.01.006

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

CHEN Xifeng, HUANG Teng, LIU Ling, HAN Yi

(School of Earth Sciences and Engineering, HoHai University, Nanjing 210098, Jiangsu, China)

Received:2012-09-25 Revised:2012-10-31 Online:2013-01-20 Published:2013-02-06

Abstract

Abstract:

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.

Key words: Metro tunnel, deformation monitoring, reference point, free station, combination variance of unit weight test, stability

CHEN Xifeng, HUANG Teng, LIU Ling, HAN Yi. Application of Combination Variance of Unit Weight Test in Deformation Monitoring of Metro Tunnel[J]. Tunnel Construction, 2013, 33(1): 33-37.

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

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