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Study on Application of Total Station in Highway Tunnel Deformation Measurement

Author: ZuoWeiZheng
Tutor: ChenJianXun
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Tunnel project Total Station Non-contact measurement MLM On-site monitoring Accuracy analysis
CLC: U456.3
Type: Master's thesis
Year: 2011
Downloads: 125
Quote: 1
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Abstract


Deformation monitoring is an important means to monitor the stability of the surrounding rock and supporting structure, to ensure construction safety, reasonable assurance as an important and indispensable support parameters, is the connection point and a necessary part of the design and construction. Traditional contact measurement surrounding rock deformation has been unable to meet the requirements of tunnel construction. Total station measurements tunnel surrounding rock deformation has been applied, the total station measurements and compared to traditional measurement methods, accuracy has not been a very good answer, affected the promotion of of total station non-contact measurement. To evaluate the accuracy of the total station non-contact measurement method and measurement accuracy, the to the pier beam tunnel and Yuanjiazao acupuncture tunnel as engineering relying on computational analysis by field comparison test and accuracy are two methods, the measurement of total station conducted a comprehensive analysis accuracy. The main contents and results are as follows: (1) the pier beam Tunnel relying Vault Sink contrast measurement field test, measurement methods, including the Level-contact measurement, the total station on the edge measurement and three-dimensional coordinates of the non-contact measurement; Yuans acupuncture tunnel relying convergence measurement of contrast-site test, measurement methods including Convergence meter-contact measurement, Total Station edge measurement and three-dimensional coordinates of non-contact measurement. (2) Monitoring results show that: the total station measurements tunnel surrounding rock deformation monitoring to the value of the core soil before excavation contact measurement monitoring less than the surrounding rock deformation. The core soil before excavation, vault sinking value of 19.7mm, accounting for 17.7% of the sinking value of the construction phase of value of clearance convergence is 11.1mm, accounting for 28.8% of the value of the construction phase of convergence; core soil excavation, on the edge measurement non-contact measurement and water level monitoring results, the average deviation is 1.9mm, accounting for 1.7% of the value of the sinking of the construction phase, the edge average deviation value measurement non-contact measurement and convergence gauge monitoring results 0.83mm, convergence value of the share of the construction phase. 2.3 percent;-to-edge measurement is higher than the three-dimensional coordinate measurement accuracy. (3) application of the law of error propagation calculation and analysis of Total Station-to-edge measurements in tunnel construction engineering precision applications. The analysis results show that: When the The Total Station accuracy of MS = 2ppm, ma = 1 \Shen value of monitoring accuracy can reach 0.43 0.68mm convergence value of monitoring accuracy can reach 0.47 ~ 0.69 mm (4) through different precision total station monitoring the tunnel surrounding rock deformation calculation shows that: When the total station accuracy or higher than ms = 2ppm, ma = 2 \Computational analysis, contrast and precision through the on-site monitoring data show that the total station the edge measurement monitoring accuracy within the allowable range, the location of the station is more flexible, improve work efficiency, and construction parallel job monitoring to good effect.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel observations and experimental > Tunnel construction and use of monitoring
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