Steel-fibre-reinforced shotcrete for tunnel linings

Steel-fibre-reinforced shotcrete for tunnel linings

240A Hardness, abrasion and wear Shotcrete 866202 Relation between abrasiveness and quartz content for some Coal Measures sediment. Short communica...

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240A

Hardness, abrasion and wear

Shotcrete

866202 Relation between abrasiveness and quartz content for some Coal Measures sediment. Short communication West. G Int J Min Geol Engng V4. NI. March 1986. P73-78

866205 Steel-fibre-reinforced shotcrete fl)r tunnel linings Rose. D Tunn Tunnlg VI8. ~ . May t986. P39-43

The TRRL undertook a programme of research in the Selby Tunnels with the aim of validating the relation between wear of tunelling machine cutters and the abrasiveness and strength of the rock. Work was terminated before sufficient cutter changes had taken place for a meaningful pattern to emerge. However. enough data was obtained to show that a relation exists between the abrasiveness of the rock and its quartz content for the Coal Measures sediments encountered on the tunnel drive.

The history of shotcrete and steel-fibre-reinforced-shotcrete (SFRS) is briefly reviewed. Tunnel design using SFRS. shotcrete -ground bonding, post crack deformation, shotcrete failure mechanisms and the use of microsilica addition to increase shotcrete density and flexural strength are discussed. It it considered that SFRS with microsilica produces a strong lining. placed with minimum rebound and having good adhesion in any ground, which is more economical than. and technically equal or superior to. conventional shotcrete usnng wire mesh.

Grouting

Rock and Soil Reinforcement and Support 866203 Geological problems overcome at Revelstoke Forstcr, J W lnt Water Power Dam Constr V38. N7. July 1986. P53-58 The Revclstoke hydroelectric project on the Columbia river. Canada. is at a site m essence a spectrum of strong quartzfeldspar intcrlavered with weak mica-rich layers. The rock has also bccn weakened by alteration at shears and discontinuities. Many problems were encountered with slope stability, foundation shear strength and [bundation shape. Extensive site invcsttgation was carried out before and during construction. Slope flattening, rock anchors, grouted rebar dowels and consolidation grouting were among improvement methods used.

866206 Enhancing the performance of large diameter piles by grouting Bruce. D A Ground Engng vIg. N4, May 1986. P9-15 A review of published data on pile grouting over the last decade. Case histories are presented in three basic categories: grouting from within the pile shaft before concreting; toe or ground grouting after pile installation: and ground consolidatzon, either before or after pile construction. 866207 Effect of dilatancy on permeability in sands stabilised by chemical grout. Technical note Mori, A; Tamura, M Soils Found V26. NI. March 1986. P96-104 Three sands, stabiliscd by silicate and acrylamide grouts, were subjected to triaxial compression tests to investigate the relationship between permeability and dilatancy. It was concluded that permeability could increase significantly because of flow channels caused by increasing shear stress, and the relation between permeability and shear stress increment depends on density and grain size of the sand and the type of grout.

Reinforced earth 866208 Geotextiles - application on site Civ Engng, London June 1986 P10-23

Bolts and anchors 866204 Interaction analysis of anchor-soil systems Desai. C S: Muqtadir, A: Scheele. F J Geotech Engng Div A S C E VII2. N5. May 1986, P537-553 Interaction analysis and understanding of the mechanism of stresses and deformations in anchor-soil systems can require consideration of three-dimensional geometry, nonlinear soil behaviour, and relative motions at the interface. A three dimensional finite element procedure that can allow for these factors is proposed, tt is applied for analysis of a field load test involving an anchor grouted in sand. A general yet simple elastic-plastic hardening model is used for the sand, The constants for this model are found from a series of laboratory tests on cubical spectmens of the sand. The interface is simulated by using thin-layer elements. The finite element predictions provide satisfactory correlation with the field observations, and are able to explain various aspects of the stress-deformation mechanism in and around the anchor. Auth

Four successful site applications of geotextilcs are described: (l) the construction of a temporary reinforced earth'rockfil[ subsurface retaining wall to enable construction o f a servnce reservoir close to an existing earthfill impoundment: (2) the use of biodegradable geotextites forerosion control and slope stabilisation; (3) polymer grid reinforced asphalt roadveays; and (4) the use of geotextiles as a filter/separator between filter sands and drainage gravels in a sludge drying bed. 866209 Soil reinforcing technique in mine backfilling Lun, P T W lnt J M i n G e o l Engng V4. NI. March 1986, P47-66 Current methods of stabilizing mine backfill involve the introduction of cementing agents, rock fragments or timber into the fill mass. The aim of this study is to examine the applicability of reinforced earth principles in mine backfilling. Consideration is given to the identification of the functions and reqmrements of backfill. Various factors affecting the fill strength

~) 1986 Pergamon Journals Ltd. Reproduction not permitted