Management Criterion for Large Deformation Tunnels

Su Min Zhang; Yong Quan Zhu

doi:10.4028/www.scientific.net/AMM.204-208.1468

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 204-208Management Criterion for Large Deformation Tunnels

Management Criterion for Large Deformation Tunnels

Abstract:

The limit displacement was calculated with regard to a large deflection tunnel. The continuum calculation model was established with actual parameters of the surrounding rock of the tunnel as input. In the simulation calculation, the action occasion of the support structure was determined based on the ratio of the measured rock pressure to the geo-stress, and the bearing capacity of the R.C. compressive bending component of the support was expressed with the axial force and bending moment on losing capacity of the support structure in loading; The limit displacement of the tunnel wais determined finally combined with the measured displacement of control points on collapsed or gauge-intrusive sections and cracked primary support or secondary lining sections. Since the deforming rate is more concerned than the displacement in drill and blast tunnel construction, three-level-management of deflection and deforming rate was proposed based on the statistical analysis of measured deforming rate, and the safety requirement for deflection control in construction. The management criterion has reference value to other similar tunnels where difficulty is encountered due to large deflection occurring in construction.

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Periodical:

Applied Mechanics and Materials (Volumes 204-208)

Pages:

1468-1471

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.204-208.1468

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Online since:

October 2012

Authors:

Su Min Zhang, Yong Quan Zhu

Keywords:

Deforming Rate, Large Deflection, Limit Displacement, Management Criterion, Tunnel

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