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Cairo Metro's Line 2 on course
UNDERGROUND EXCAVATIONS:TUNNELS 9S8399 Tailgate roadway convergence: a key indicator of potential ground control problems R. M. Cox, in: Proc. IMh international conference, ground control in mining, Morgantown, WV, 1994, ed S.S. Peng, (WVU/USBM), 1994, pp 185-189. Regression analyses of tailgate entry convergence data conducted by the USBM indicate that entry closure may be characterized as an exponential function of the distance outby the longwall face. Assuming that the entry closure is caused by the abutment loads created by the excavation of the longwall panel, the resulting convergence equation can be integrated to locate the centroid of abutment loading. This information can be used to document zones of potential ground failure ahead of the operating face. (from Author) 958400 Difficult ground halts TBM M. Page, Tunnels & Tunnelling, 27(6), 1995, pp 26-28. Difficult ground conditions at the foot of a horst has resulted in the failure of a tunnel boring machine during the excavation of the Hallandas east rail tunnel in Sweden. Although the west tunnel had been completed by drill and blast through poor conditions, a completely different type of rock and a lot of water had been encountered in the east tunnel just 30 m away. Solutions are discussed. (P.M.Taylor) 958401 Athens tunnel collapse raises Metro doubts A. Greeman, New Civil Engineer (NCE), 1136, 1995, pp 3-4. Problems caused by a tunnelling face collapse on the £2 bn Athens Metro are described. The expanding hole was caused by excessive overbreak in front of the tunnel boring machine, despite modifications after an eartier similar incident. Responsibility for finding and funding a solution is with the contractor Olympic Metro Consortium, but must meet with approval from client Attiko Metro. Modifications made to the TBM by Mitsubishi are discussed. (P.M.Taylor) 9584O2 Geo-technical problems leading to intake portal collapse and construction features of main tunnel from CH 0 to CH 218 of Rnnganadi hydro-electric project: Arunaehal Pradesh (a case s t a y ) M. V. Kunjayyappan, Irrigation & Power Journal, 51(4), 1994, pp 57-73. The hydro-electric potential of Ranganadi has been estimated to be about 505 MW and their potential is proposed to be harnessed in two stages. The upper stage called stage II envisages construction of 112 m high Rockfill Dam with a Power House for 100 MW at the foot of the Dam, at 51 km from Kimin. The lower stage called Stage-I, envisages creation of a small Re-~xvoir by constructing a Diversion Dam of 62 m high at 41 km from Kimin and the Pondage so created is diverted to Dikrong River through a water conductor system consisting of a main tunnel 8.779 km long and 6.8 m dig, a pressure tunnel of 0.924 kra long and 5.8 m dia and a surface, Power House for 3 units of 135 MW Generators with a total head of 326 m. (Author)
Tunnels 958403 STUVA: tunnels stand up to Kobe's earth shaker ANON, Tunnels & Tunnelling, 27(6), 1995, p 15. Methods adopted to construct earthquake-proof tunnels, described at the recent World Tunnel Congress in Stuttgart, are discussed. Bored tunnels were adopted in Japan to
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overcome earthquake hazards. Methods for excavating bored tunnels are described. Tunnel excavation in Russia through earthquake-prone regions is outlined. Tunnelling projects planned in Germany are described. (P.M.Taylor) 958404 Ground charneterisation for the Providence CSO storage tunnels R. Dill, D. Dobbels & J. Parker, Tunnels & Tunnelling, 27(5), 1995, pp 23-26. A project to reduce sewage discharge into Narrangansett Bay, Rhode Island, involves the construction of deep tunnels to collect and store combined flows. The proposed layout for the Province Combined Sewer Overflow facilities includes two tunnels, work shafts, pumping facilities, numerous newsurface collection facilities and drop shafts. The complex approach and tunnelling methods used by the subsurface exploration programme needed to overcome difficult ground conditions are described. (P.M.Taylor) 9584O5 The Heathrow express trial tunnel A. P. Deane, Proceedings - ICE: Geotechnical Engineering, 113(3), 1995, pp 144-156. Describes the NATM trial tunnel built as part of the Heathrow Express project. The first section gives the principle reasons for the choice of NATM and for the construction of the trial tunnel. It includes details of the tunnel design, of the extensive instrumentation installed, methods of construction and durations of the main activities. The second section concentrates on the information available from the ground monitoring installed around the tunnel. Movements at and below the existing ground surface are summarized and presented in various graphical formats to facilitate comparison with current standard methods of settlement prediction and to allow trends to be established. (from Authors) 958406 Acting on the method K. Mussger, Ground Engineering, 28(3), 1995, pp 30-31. Discusses the NATM tunnelling technique, and lessons to be learned following the Heathrow Express Tunnel collapse. Safety, risk assessment, and monitoring in NATM tunnel design are considered. The benefits outweigh the drawbacks. (J.M.McLaughlin) 958407 Lined on time I. Moore, Surveyor, 182(5339), 1995, p14. This article describes relining of the 6km Frankley water supply tunnel. The works were carried out in 12 weeks. 3m long GRP sections had to be used in place of standard 6m pipe sections, effectively doubling the number of joints. The work was necessitated by an uprating of operating pressure from 1 to 6 bar. (J.M.McLaughlin) 958408 Cairo Metro's Line 2 on course ANON, Tunnels & Tunnelling, 27(6), 1995, p13. The planned network of metro lines for the city of Cairo is described. The 42.5 kin of Line 1 have been completed and the 18 km of line 2 are now under construction. When complete it will form a double-track metro in a single tunnel, 84 m in diameter. Excavation of the tunnels from Line 2 is discussed, procedures and materials used for grouting and tunnel finishing are outlined. (P.M.Taylor)
Tunnels 958403 STUVA: tunnels stand up to Kobe's earth shaker ANON, Tunnels & Tunnelling, 27(6), 1995, p 15. Methods adopted to construct earthquake-proof tunnels, described at the recent World Tunnel Congress in Stuttgart, are discussed. Bored tunnels were adopted in Japan to
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overcome earthquake hazards. Methods for excavating bored tunnels are described. Tunnel excavation in Russia through earthquake-prone regions is outlined. Tunnelling projects planned in Germany are described. (P.M.Taylor) 958404 Ground charneterisation for the Providence CSO storage tunnels R. Dill, D. Dobbels & J. Parker, Tunnels & Tunnelling, 27(5), 1995, pp 23-26. A project to reduce sewage discharge into Narrangansett Bay, Rhode Island, involves the construction of deep tunnels to collect and store combined flows. The proposed layout for the Province Combined Sewer Overflow facilities includes two tunnels, work shafts, pumping facilities, numerous newsurface collection facilities and drop shafts. The complex approach and tunnelling methods used by the subsurface exploration programme needed to overcome difficult ground conditions are described. (P.M.Taylor) 9584O5 The Heathrow express trial tunnel A. P. Deane, Proceedings - ICE: Geotechnical Engineering, 113(3), 1995, pp 144-156. Describes the NATM trial tunnel built as part of the Heathrow Express project. The first section gives the principle reasons for the choice of NATM and for the construction of the trial tunnel. It includes details of the tunnel design, of the extensive instrumentation installed, methods of construction and durations of the main activities. The second section concentrates on the information available from the ground monitoring installed around the tunnel. Movements at and below the existing ground surface are summarized and presented in various graphical formats to facilitate comparison with current standard methods of settlement prediction and to allow trends to be established. (from Authors) 958406 Acting on the method K. Mussger, Ground Engineering, 28(3), 1995, pp 30-31. Discusses the NATM tunnelling technique, and lessons to be learned following the Heathrow Express Tunnel collapse. Safety, risk assessment, and monitoring in NATM tunnel design are considered. The benefits outweigh the drawbacks. (J.M.McLaughlin) 958407 Lined on time I. Moore, Surveyor, 182(5339), 1995, p14. This article describes relining of the 6km Frankley water supply tunnel. The works were carried out in 12 weeks. 3m long GRP sections had to be used in place of standard 6m pipe sections, effectively doubling the number of joints. The work was necessitated by an uprating of operating pressure from 1 to 6 bar. (J.M.McLaughlin) 958408 Cairo Metro's Line 2 on course ANON, Tunnels & Tunnelling, 27(6), 1995, p13. The planned network of metro lines for the city of Cairo is described. The 42.5 kin of Line 1 have been completed and the 18 km of line 2 are now under construction. When complete it will form a double-track metro in a single tunnel, 84 m in diameter. Excavation of the tunnels from Line 2 is discussed, procedures and materials used for grouting and tunnel finishing are outlined. (P.M.Taylor)