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PREDICTION OF TUNNEL CASING DRIVING FORCE IN MICROTUNNELING TECHNOLOGY: ASSESSMENT OF ROCK/CASING CONTACT AREA UNDER CONDITION OF UPLIFT



In tunnel construction with microtunneling technology and driving of casing, the estimated and actual data on friction under condition of uplift differ considerably. The length of the rock/casing contact area under uplift in stable rock mass during straight-line driving with pressurized lubricant is estimated from the solution of a contact problem using the methods of material resistance. The curves of bend of the driven casing, its length and the rock/casing contact length in case of the casing uplift in the center are presented. The curve parameters are the construction clearance, rise, pressing force and Euler’s force of stability loss. The behavior of the curves points at the considerable increase in the size of the contact area when the rise of casing approaches the value of construction clearance. The obtained results allow a more accurate analysis of the friction component of driving forces and their sensitivity to variation in the driving mode parameters.

: 1
2019
ISBN: 0236-1493
УДК: 622.331:622.271
DOI: 10.25018/0236-1493-2019-01-0-63-68
Authors: Shornikov I. I.

Authors' Information:
Shornikov I. I., Candidate of Technical Sciences, Assistant Professor,
Mining Institute, National University of Science and Technology «MISiS»,
119049, Moscow, Russia, e-mail: shornicovivan@gmail.com.

Key words:
Tunnel casing, driving forces, friction component, lubricant fluid, construction clearance, longitudinal dimension of contact area, buoyant properties of casing, bend at uplift.

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