Application of a Total Station with RDM to Monitor Tunnel Displacement

Formulas for tunnel crown settlement and horizontal displacement measurement are presented in this paper according to the theory of tunnel displacement as measured by a total station with three-dimensional (3D) coordinate measurement and with remote distance measurement (RDM). Comparison tests using 3D coordinate measurement, RDM, and traditional measurement (i.e., precision levels and tape extensometers) were conducted at a tunnel construction site. Tests showed that measurement of displacement by a total station is more convenient than that by traditional methods. Measurement of crown settlement by a total station with 3D coordinate measurement produces an error, which accounts for a 13% difference in total crown settlement. The accuracy of horizontal displacement measurement by a total station with 3D coordinate measurement is weak compared with RDM and traditional methods. Three-dimensional coordinate measurement is therefore not suitable for tunnel horizontal displacement. Tunnel displacement measurement by a total station with RDM obeys the law of curve and so meets the demand of construction monitoring attained by traditional methods. Use of a total station with RDM is the best method for measuring tunnel displacement, especially in tunnels with weak surrounding rock.

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  • English

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  • Accession Number: 01641625
  • Record Type: Publication
  • Files: TRIS, ASCE
  • Created Date: Feb 28 2017 3:05PM