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Elasto-plastic theory applied to pressure tunnels
231A stone at the junction of the lower side walls and the concave invert. Extensive repair works began in July 1982. 846228 Earth pressure balance shield: case studies, current research, future prospects Naito, K Underground Space V8, N2, March-April 1984. P89-94 846229 Rock-support interaction calculations for pressure shafts and tunnels Brown, E T; Bray, J W In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P555565. Publ Rotterdam." A. A. Balkema, 1982 A new method of making rock-support interaction calculations for plane strain, axi-symmetric pressure shaft and tunnel problems is presented. This method uses non-linear peak and residual rock mass strength criteria, allows for strain-softening and the development of plastic volumetric strains, calculates the distribution of groundwater pressures by allowing the permeability of the fractured rock mass in the plastic zone to vary with the square of the volumetric strain, and evaluates the influence of water pressure subsequently applied inside the lined excavation. 846230 Evaluation of classification systems for tunnels in nonsqueezing ground conditions Jethwa, J L; Dube, A K; Singh, B; Singh, B; Mithal, R S In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) II2, P607612. Publ Rotterdam: A. A. Balkema, 1982 To evaluate classification systems by measuring actual rock loads on supports during the construction stages of tunnels, the Maneri-Bhali hydroelectric tunnel and Salal hydroelectric tunnel, both in the lower Himalayas, India, were instrumented. The limited field data available indicated that the Q-system of Barton provides reasonably reliable values of short-term vertical rock pressure for steel supported tunnels excavated by conventional methods under non-squeezing rock conditions. 846231 Method of designing pressure tunnel linings with allowance made for rheological processes Kubetsky, V L In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) I.'2, P631638. Publ Rotterdam." A. A. Balkema. 1982 A method is presented for calculating the stress-strain state of single-layer and multi-layer pressure tunnel linings subjected to inner hydrostatic pressure, allowing for the rheological properties of the rocks and the materials of the lining. Some problems related to the description and determination of the creep parameters of rocks and building materials are discussed as applied to calculations of pressure tunnels for inner hydrostatic pressure. It is shown that such materials should be characterized by higher than usual creep. 846232 Some results of research on fining prestressing for the pressure tunnel of a pumped storage hydroelectric plant Kujundzic, B; Ivanovic, K; Markovic, O; Nikolic, Z In: Rock Meclumics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) 1"2, P639652. Publ Rotterdam." A. A. Balkema, 1982
A 6.3rd Internal diameter pressure tunnel was driven by mole through Triassic limestone, marl and marly limestone and lined using non-reinforced concrete with pressure grouting. The paper presents the following: tunnel specifications, stress analysis of the lining-rock mass system, the design concept with prestressing by pressure grouting and methods used for rock mass investigation and testing the lining on pilot stretches. 846233 Elasto-plastic theory applied to pressure tunnels Lu Jiayou In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2. P661666. Publ Rotterdam: A. A. Balkema. 1982 In calculating the stresses in the lining of a pressure tunnel with circular cross-section, it is assumed that rock mass deformability follows the theory of elasticity. A method is presented which deals with the calculation of the lining stresses considering the elasto-plastic stress-strain relationship based on some in-situ test results. The rock masses are treated as the linear strain hardening media. 846234 High pressure tunnel systems at Sima Power Plant Myrset, O; Lien, R In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P667676. Publ Rotterdam. A. A. Balkema. 1982 Instead of a conventional surge shaft in the water supply system for the Sima Power Plant, Norway, the comparatively new air cushion chamber concept was used. The geology, site investigations performed and design criteria for unlined high pressure tunnels for the upper portion of the head, instead of steel lined shafts all the way to the top, are discussed. Problems related to establishing access to unlined high pressure tunnels are also described. 846235 Certain peculiarities of rock pressure manifestation in ArpaSevan Tunnel construction Petrosian, G M; Simonian, A A; Sanaguian, A A In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P677682. Pub/Rotterdam." A. A. Balkema. 1982 The results of combined investigations of rock pressure manifestation and rock mass stresses and deformation are presented, carried out during the construction of the Arpa-Sevan diversion project, Armenia, USSR. A series of lab tests was also performed. Pressure intensive manifestation laws established during the investigation were used for new tunnel lining designs which incorporated the factors of rock mass stability, high tunnelling rates and operating reliability. 846236 New ways for the construction of pressure tunnels (In German) Seeber, G In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P705716. Publ Rotterdam." A. A. Balkema. 1982 A number of techniques are available to cope with the increased stresses on concrete pressure tunnel linings. Prestressing or combining with plastic sheeting is possible but for the very high pressure encountered in pressure shafts the only possibility is a steel lining. Modern design methods based on in-situ measurement allow a reduction in the thickness of the lining to such an extent that the practicable minimum thickness would be sufficient for the largest part of a pressure shaft.
A 6.3rd Internal diameter pressure tunnel was driven by mole through Triassic limestone, marl and marly limestone and lined using non-reinforced concrete with pressure grouting. The paper presents the following: tunnel specifications, stress analysis of the lining-rock mass system, the design concept with prestressing by pressure grouting and methods used for rock mass investigation and testing the lining on pilot stretches. 846233 Elasto-plastic theory applied to pressure tunnels Lu Jiayou In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2. P661666. Publ Rotterdam: A. A. Balkema. 1982 In calculating the stresses in the lining of a pressure tunnel with circular cross-section, it is assumed that rock mass deformability follows the theory of elasticity. A method is presented which deals with the calculation of the lining stresses considering the elasto-plastic stress-strain relationship based on some in-situ test results. The rock masses are treated as the linear strain hardening media. 846234 High pressure tunnel systems at Sima Power Plant Myrset, O; Lien, R In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P667676. Publ Rotterdam. A. A. Balkema. 1982 Instead of a conventional surge shaft in the water supply system for the Sima Power Plant, Norway, the comparatively new air cushion chamber concept was used. The geology, site investigations performed and design criteria for unlined high pressure tunnels for the upper portion of the head, instead of steel lined shafts all the way to the top, are discussed. Problems related to establishing access to unlined high pressure tunnels are also described. 846235 Certain peculiarities of rock pressure manifestation in ArpaSevan Tunnel construction Petrosian, G M; Simonian, A A; Sanaguian, A A In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P677682. Pub/Rotterdam." A. A. Balkema. 1982 The results of combined investigations of rock pressure manifestation and rock mass stresses and deformation are presented, carried out during the construction of the Arpa-Sevan diversion project, Armenia, USSR. A series of lab tests was also performed. Pressure intensive manifestation laws established during the investigation were used for new tunnel lining designs which incorporated the factors of rock mass stability, high tunnelling rates and operating reliability. 846236 New ways for the construction of pressure tunnels (In German) Seeber, G In: Rock Mechanics: Caverns and Pressure Shafts (papers to the ISRM Symposium, Aachen, 26-28 May 1982) V2, P705716. Publ Rotterdam." A. A. Balkema. 1982 A number of techniques are available to cope with the increased stresses on concrete pressure tunnel linings. Prestressing or combining with plastic sheeting is possible but for the very high pressure encountered in pressure shafts the only possibility is a steel lining. Modern design methods based on in-situ measurement allow a reduction in the thickness of the lining to such an extent that the practicable minimum thickness would be sufficient for the largest part of a pressure shaft.