Effect of rock mass anisotropy on lining-medium interaction in power tunnels : Proc International...
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902463 Application of newly developed shield tunnelling machine for intensive curve Maeda, H; Yoshii, Y Proc 6th Australian Tunnelling Conference, ~Welbourne, March 1987 VI. P347-354. Publ Parkrille: AuslMM, 1987 A sharp curve excavation shield machine has been developed which is able to drive a sharper curve than conventional machines. Configuration of the machine, including shield body sharp curve flexing device, cutter disc bending device and shield jack rocking support, is described. A trial excavation in soft clay is presented. Behaviour of the shield machine, seg- ments, and surrounding ground was monitored, showing the new machine lowers construction costs and environmental disturbance. 902464 New developments in ground reinforcement and treatment for tunnelling Bruce, D A; Boley, D I: Gallavresi, F Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 V2, P811-835. Publ Littleton: Society of Mining Engineers, 1987 Recent developments and applications of support in soft ground conditions are described. Soil nails, soil dowels, or reticulated micropiles may be used for slope support or to stabilise ground around a tunnel from the surface. Horizontal micropiles or jet grouting can be used to stabilise ground ahead of a tunnel face. Ground treatment by grouting is dis- cussed with reference to permeation grouting by the tube a manchette (Rodinjet) method and jet grouting. Illustrative case histories are presented. 902465 Nonlinear finite element analysis of reinforced concrete test tunnel in loess Gou, Z Y; Liu, Z D; Rao, W Y Proc International Conference on Engineering Problems of Regional Soils, Beijing, 1!-!5 August 1988 P233-236. Publ Beijing: International Academic Publishers. 1989 A constitutive equation for loess is presented and used within a nonlinear finite element analysis to predict stresses and deformations around a tunnel excavated in loess at about 15m depth. Construction was by arch-crown excavation and shot- creting, then laying of the invert arch. Predicted displacements and soil stresses are in approximate agreement with field mea- surement, although lining stresses are closer. Simulated full face excavation predicts lower soil stresses and disturbance, but higher lining stresses. It is suggested that numerical analy- sis should be used to help select excavation method. 9024(~i Design recommendations for plain concrete lining in power tunnels Singh, B; Nayak, G C; Kumar, R Proc International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P281-286. Publ New Delhi: Oxford and [BH Publishing Co, 1988 Plain concrete lining is used in a large number of power tun- nels, but it is likely to crack, and construction joints may open out. The average crack opening is estimated based on defor- mation modulus and Poisson's ratio of the rock mass and thickness and ultimate tensile strength of the liner. This open- ing should not be allowed to exceed a permissible limit so the crack can close with time. Case histories are included to obtain permissible crack opening and spacing. A simple analysis is 122A proposed for estimating maximum hoop tension and bending moment in the cracked and segmented lining, and results checked by finite element analysis. Auth. 902467 Polymer concrete - a concrete with confidence for tunnel lining Rajiwala, D B; Desai, M D Proc International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 V1, P293-296. Publ New Delhi: O.rford and IBH Publishing Co, 1988 Development and use of polymer concrete for tunnel linings is discussed. Research on polymer impregnated concrete (PIC) and polymer cement concrete (PCC) show these materials have higher durability and strength criteria than currently used tunnel linings. 902468 Effect of rock mass anisotropy on lining-medium interaction in power tunnels Kumar, P; Singh, B Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P309-314. Publ New Delhi: Oxford and IBH Publishing Co. 1988 The effect of rock mass anisotropy on stresses in the lining and in the rock mass, and integration of the two mechanical com- ponents were studied. An elastic model of a lined circular tun- nel in an isotropic medium and a continuum model of an anisotropic rock mass, which allows various degrees of anisot- ropy, are described. The elastic theory is extended to aniso- tropic rocks and the resulting numerical model analysed in plane strain. Stresses in the lining, the rock mass and the 2 combined are examined for each degree of anisotropy. Load transmission from lining to rock and lining stress are discussed. 902469 Simulation of rock-liner interaction near tunnel face Sharma, K G; Pandya, A B Proc International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P315-320. Publ New Delhi." Oxford and IBH Publishing Co. 1988 Two dimensional axisymmetric, elastic and elasto-plastic anal- yses of a deep circular tunnel, with and without concrete lin- ing, have been carried out to simulate the ground-support interaction near the tunnel face. The Hock-Brown failure cri- terion was used for elastoplastic analysis. The deformed shape, yielded zone, deformation and stress variations are plotted for several cases. Stresses and deformations are compared with those from plane strain idealisation. 902470 Maintaining underground structures at Northfield Cregger, D M; Ferreira, A; Rosenblad, J L; Howard, J Proe International Symposium Tunnellingfor Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P331-336. Publ New Delhi." Oxford and IBH Publishing Co, 1988 Monitoring and maintenance of the unlined tunnels in the Northfield Mountain pumped storage plant are described. Geology and groundwater conditions are outlined. Monitor- ing was by piezometer, extensometer and flow meter, plus observation. After stability analyses based on these results, a maintenance program was planned for areas of potential falls. This comprised scaling and support, bolting, shotcrete lining, 1990 Pergamon Press plc. Reproduction not permitted
Transcript of Effect of rock mass anisotropy on lining-medium interaction in power tunnels : Proc International...
902463 Application of newly developed shield tunnelling machine for intensive curve Maeda, H; Yoshii, Y Proc 6th Australian Tunnelling Conference, ~Welbourne, March 1987 VI. P347-354. Publ Parkrille: AuslMM, 1987
A sharp curve excavation shield machine has been developed which is able to drive a sharper curve than conventional machines. Configuration of the machine, including shield body sharp curve flexing device, cutter disc bending device and shield jack rocking support, is described. A trial excavation in soft clay is presented. Behaviour of the shield machine, seg- ments, and surrounding ground was monitored, showing the new machine lowers construction costs and environmental disturbance.
902464 New developments in ground reinforcement and treatment for tunnelling Bruce, D A; Boley, D I: Gallavresi, F Proc 1987 Rapid Excavation and Tunnelling Conference, New Orleans, 14-17 June 1987 V2, P811-835. Publ Littleton: Society of Mining Engineers, 1987
Recent developments and applications of support in soft ground conditions are described. Soil nails, soil dowels, or reticulated micropiles may be used for slope support or to stabilise ground around a tunnel from the surface. Horizontal micropiles or jet grouting can be used to stabilise ground ahead of a tunnel face. Ground treatment by grouting is dis- cussed with reference to permeation grouting by the tube a manchette (Rodinjet) method and jet grouting. Illustrative case histories are presented.
902465 Nonlinear finite element analysis of reinforced concrete test tunnel in loess Gou, Z Y; Liu, Z D; Rao, W Y Proc International Conference on Engineering Problems of Regional Soils, Beijing, 1 !-!5 August 1988 P233-236. Publ Beijing: International Academic Publishers. 1989
A constitutive equation for loess is presented and used within a nonlinear finite element analysis to predict stresses and deformations around a tunnel excavated in loess at about 15m depth. Construction was by arch-crown excavation and shot- creting, then laying of the invert arch. Predicted displacements and soil stresses are in approximate agreement with field mea- surement, although lining stresses are closer. Simulated full face excavation predicts lower soil stresses and disturbance, but higher lining stresses. It is suggested that numerical analy- sis should be used to help select excavation method.
9024(~i Design recommendations for plain concrete lining in power tunnels Singh, B; Nayak, G C; Kumar, R Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P281-286. Publ New Delhi: Oxford and [BH Publishing Co, 1988
Plain concrete lining is used in a large number of power tun- nels, but it is likely to crack, and construction joints may open out. The average crack opening is estimated based on defor- mation modulus and Poisson's ratio of the rock mass and thickness and ultimate tensile strength of the liner. This open- ing should not be allowed to exceed a permissible limit so the crack can close with time. Case histories are included to obtain permissible crack opening and spacing. A simple analysis is
122A
proposed for estimating maximum hoop tension and bending moment in the cracked and segmented lining, and results checked by finite element analysis. Auth.
902467 Polymer concrete - a concrete with confidence for tunnel lining Rajiwala, D B; Desai, M D Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 V1, P293-296. Publ New Delhi: O.rford and IBH Publishing Co, 1988
Development and use of polymer concrete for tunnel linings is discussed. Research on polymer impregnated concrete (PIC) and polymer cement concrete (PCC) show these materials have higher durability and strength criteria than currently used tunnel linings.
902468 Effect of rock mass anisotropy on lining-medium interaction in power tunnels Kumar, P; Singh, B Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P309-314. Publ New Delhi: Oxford and IBH Publishing Co. 1988
The effect of rock mass anisotropy on stresses in the lining and in the rock mass, and integration of the two mechanical com- ponents were studied. An elastic model of a lined circular tun- nel in an isotropic medium and a continuum model of an anisotropic rock mass, which allows various degrees of anisot- ropy, are described. The elastic theory is extended to aniso- tropic rocks and the resulting numerical model analysed in plane strain. Stresses in the lining, the rock mass and the 2 combined are examined for each degree of anisotropy. Load transmission from lining to rock and lining stress are discussed.
902469 Simulation of rock-liner interaction near tunnel face Sharma, K G; Pandya, A B Proc International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P315-320. Publ New Delhi." Oxford and IBH Publishing Co. 1988
Two dimensional axisymmetric, elastic and elasto-plastic anal- yses of a deep circular tunnel, with and without concrete lin- ing, have been carried out to simulate the ground-support interaction near the tunnel face. The Hock-Brown failure cri- terion was used for elastoplastic analysis. The deformed shape, yielded zone, deformation and stress variations are plotted for several cases. Stresses and deformations are compared with those from plane strain idealisation.
902470 Maintaining underground structures at Northfield Cregger, D M; Ferreira, A; Rosenblad, J L; Howard, J Proe International Symposium Tunnelling for Water Resources and Power Projects, New Delhi, 19-23 January 1988 VI, P331-336. Publ New Delhi." Oxford and IBH Publishing Co, 1988
Monitoring and maintenance of the unlined tunnels in the Northfield Mountain pumped storage plant are described. Geology and groundwater conditions are outlined. Monitor- ing was by piezometer, extensometer and flow meter, plus observation. After stability analyses based on these results, a maintenance program was planned for areas of potential falls. This comprised scaling and support, bolting, shotcrete lining,
1990 Pergamon Press plc. Reproduction not permitted
