Tunnel construction

Tunnel construction

U N D E R G R O U N D EXCAVATIONS:GROUNDWATER General underground storage 954344 Underground repositories for non-nuclear waste: considerations for e...

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U N D E R G R O U N D EXCAVATIONS:GROUNDWATER

General underground storage 954344 Underground repositories for non-nuclear waste: considerations for engineering design ANON (International Tunnelling Association Working Group), Tunnelling & Underground Space Technology, 9(4), 1994, pp 461-469. This third report by the ITA Working Group 'Design of Underground Structures' deals with the state-of-the-art vis-avis the main design considerations for underground waste repositories in different types of ground. The report discusses various types of underground facilities, as well as the general approach to safety assessments and design criteria. (Authors)

954345 Underground solution for wastewater treatment plant D. Wilson, Tunnels & Tunnelling, 26(11), 1994, pp 24-26. The large Media Pustenia Treatment Plant is now under construction in an alpine valley, northern Italy. The underground structure will not be affected by climatic extremes and will ensure continuous and reliable plant operation. Environmental impact will also be minimized. Design, construction and geoteehnical considerations are discussed. (P.M.Taylor)

Underground construction methods 954346 Civil engineering and tunnel design J. P. Farrow & P. M. Claye, Proceedings - ICE: Civil Engineering, 102(Special Issue 2), 1994, pp 23-33. The Thames Water Ring Main comprises 80 km of tunnels plus eleven major underground pumping stations, and is the largest water supply tunnel system in the UK. The project was completed and commissioned two years ahead of programme and within the £250 million budget. This paper describes the design of shafts, tunnels, pumping stations and associated civil engineering works. (Authors) 954347

Planning and design of the Holland Park shaft C. J. A. Binnie, P. M. White, B. Pearcy & D. Weil, Proceedings - ICE: Civil Engineering, 102(Special Issue 2), 1994, pp 34-42. In 1990 Thames Water's proposal for a pump-out shaft in the Holland Park area encountered objections from the local planning authority which, without early resolution, threatened to cause significant delay to the construction of the Thames Water Ring Main. This paper describes bow engineering, environmental and planning skills were harnessed in a multidisciplinaray project team to solve the complex environmental and engineering problem. (from Authors)

954348 Tunnel construction M. Dick & P. A. Jaques, Proceedings - ICE: Civil Engineering, 102(Special Issue 2), 1994, pp 43-59. The core element of the Thames Water Ring Main was the construction of 80 km of tunnels required for the transfer of raw and treated water. Construction of the tunnels was carried out in two phases and involved the use of open-face shields and tunnel boring machines (TBMs). This paper describes the development of soft ground tunnelling techniques during the two phases, including tunnel lining developments, tunnel shield and TBM data, modes of operation, back-up logistics and tunnelling experiences. Tunnel cycle

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times, progress rates and details of performance monitoring are given. (Authors)

954349 Overcoming ground difficulties at Tooting Bec R. P. J. Clarke & C. N. P. Mackenzie, Proceedings - ICE." Civil Engineering, 102(Special Issue 2), 1994, pp 60-75. In 1988 construction of the Thames Water Ring Main tunnel between Streatham and Brixton was dramatically halted under Tooting Bec Common when the tunnelling machine was inundated with water and silt. The ground conditions encountered stretched the knowledge and resources of the tunnelling industry worldwide and threatened to delay significantly or undermine the whole concept of the scheme. This paper describes the unique combination of solutions adopted to complete the 1400 m of tunnel. (from Authors)

954350 Double shield TBM excavation technique: recent experiences and future development R. Grandori & F. Antonini, Felsbau, 12(6), 1994, pp 490494. The introduction of the Double Shield TBM concept represented an innovative improvement in the mechanical excavation of tunnels in rock. Through the last 20 years and some 200 km of tunnels driven and lined with Double Shield TBM, the system has reached a high degree of reliability. The authors review the most significant achievements and discuss the scope for further development. (from Authors)

954351 Construction control for underpinning piles and their behaviour during excavation Y. Iwasaki, H. Watanabe, M. Fukuda, A. Hirata & Y. Hori, Geotechnique, 44(4), 1994, pp 681-689. This paper describes a case history of cast-in-place concrete piing to support large underground structures for a subway in Nagoya city, Japan. Owing to gvotechnical and construction conditions at the site, the piles had to be designed as friction piles. Monitoring piles were installed with strain gauges to observe performance. When excavation started the axial load in the upper part of the pile increased while that in the lower part decreased. The site study - using measurements of pile-ground interaction - revealed that the effect was caused by ground heave resulting from the excavation. The observational procedure was useful, not only to confirm predetermined targets, but also to shed light on unexpected geotechnical problems. (Authors)

Groundwater problems 954352 Prevention and control of water inrush from faults in floor rocks in the workings (in Chinese) Yang Shanan, Journal - China Coal Society, 19(6), 1994, pp 620-625. This paper describes the characteristics and regularity of the deformation of floor rocks under ground pressure. It is pointed out in the theory that the relative displacement of two walls of the fault is at a maximum when the fault surface, which inclines to the workings and is parallel to the edge of the workings, coincides with the maximum swell line in the floor strata. In such cases water inrush may occur. The mechanism of water inrush from the fault in the floor is illustrated with examples. Finally, the measures for prevention and control of water inrush are proposed from the view point of hydrogeology and mining method. (English summary)