... ABSTRACT: To assess whether reinforcement is required for aged tunnel, it is necessary to clarify the rigidity of the concrete lining as well as the distribution of cracks occurred in the lining concrete. Therefore, a “tunnel lining inspection system” was adopted to photograph, extract, draw...

... correlation operation enhanced recovery leakage water leakage shotcrete contractor Fluid Dynamics specific leakage concrete lining excavation Reservoir Characterization grout take tunnel excavation consumption injection hydropower project Himalaya grout consumption rock mass tunnel...

... ABSTRACT We carried out a numerical modeling study of coupled thermodynamic, multiphase fluid flow and geomechanical processes associated with underground compressed air energy storage (CAES) in lined rock caverns. The simulation results showed that a concrete lining with a permeability...

... of decreasing construction period and cost by continuous concreting using a pre-cast form and jacks. A rising height of the slip-form was 2.5m for one time with an average height of 3.5m/day. 4.3.3 Concrete Lining The concrete lining is essential for the road tunnel in Korea, however, the concrete lining...

... ABSTRACT: Based on the response of the surrounding rock (including the relaxed grouted zone and the fault) and the reinforced concrete lining of the pressure tunnel in the full strength model test, this article discusses the stress-changing and cracking characters of the lining and the rock...

...) diameter concrete tunnel lining. A plane strain, finite element analysis was performed on the concrete/rock system. The finite element model consisted of a concrete lining zone and three (3) rock zones; a highly destressed rock zone, a transitional rock zone and an intact rock zone. Zones were...

... ft, 4063 ft, and 5191 ft during sinking of the Silver Shaft at Hecla Mining Company's Lucky Friday Mine in Wallace, Idaho. Rock displacements were monitored with three 50 ft long multiple position borehole extensometers at each level. Stress build-up in the concrete lining was monitored with four...

...DEFORMATION AND CRACKING OF A CONCRETE-LINED TUNNEL IN A ROCK MASS SUBJECTED TO A CHANGING STATE OF STRAIN Louis A. Panek Mining Engineer Bureau of Mines U.S. Department of the Interior Denver, Colorado INTRODUCTION AND SUMMARY The support of access openings near to the produc- tion zone...

... ABSTRACT INTRODUCTION A 9 m thick XIV seam is being worked on by three ascending slices with hydraulic sand stowing at Noonodih-Jitpur colliery in Jharia coalfield in India. The seam is accessed by two fully concrete lined shafts 4.88 m in diameter and 450 m deep. In early 1976 signs...

... ABSTRACT: Instrumentation placed at three - levels in the concrete lining of the 14-ft I.D. shaft at the Mt. Taylor Mine permitted checking which lining pressure equation best fit the particular geologic conditions. Talobre''s (1957) lining pressure prediction equation for clastic rock most...

... of concrete lining for an underground opening of any desired shape in rock. It was expected that by taking into account the procedure of construction and the integral action of rock with concrete lining, a mathematical model will be developed to represent the real problem. It was thus felt...

... extensometer tunnel support strain gage metals & mining load cell lining gage Upstream Oil & Gas rock bolt Anchor rock movement pressure cell installation tunnel diameter gage tunnel Reservoir Characterization Slope Indicator concrete lining single-position extensometer...

... government Thickness computer estimate Reservoir Characterization Upstream Oil & Gas criteria tunnel-shaft system reservoir geomechanics strength Rock mechanics dimension rock bolt lining thickness concrete lining circular tunnel lining RQD designation contractor shaft tunnel...