- Email: [email protected]
Analysis and monitoring of the Miyana railway tunnel constructed using the New Austrian Tunnelling Method
i 59A
See. 864130
the infinite element. Preparation time may be cut down if infinite elements are used as the model area may be extended without introducing further nodal points. This time saving method may be useful in three dimensional analysis and in the analysis of coupled problems.
Stresses around underground openings
Tunnels
See also. 864168. 864169
See also: 864199, 864200, 864201
864254 Support pressure estimation in failed rock conditions Sheorey, P R Engng Geol V22, N2, Oct 1985, P127-140
864257 Analysis and monitoring of the Miyana railway tunnel constructed using the New Austrian Tunnelling Method Yoshimura, H; Yuki. T; Yamada,Y: Kokubun, N Int J Rock Mech Min Sci V23. N1. Feb 1985. P67-75
Underground Excavations
Ultimate roof support pressure estimates using a modern rock mass classification (Barton et al, 1974) are compared with the observed values in seven cases of squeezing ground. Since the agreement is not good, a modification of the classification method is suggested. An approximate guideline for modifying the classification for obtaining wall support pressures is given. Assuming the failed rock surrounding an underground opening to behave as a Coulomb material, a semi-analytical elastoplastic method is proposed for calculating the ultimate support pressure. This method uses a step-wise gradual change of properties, eliminating the discontinuity and is shown to give reasonable estimates of support pressure if the peak and residual angles of internal friction are chosen from the classification of Bieniawski (1976) and of Barton (I 974), respectively. Auth. 864255 Evaluating some ground control factors in close proximity multi-seam mining Grenoble, A: Haycocks, C: Wu, W Proc 2nd Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Reno, Nevada, 12-13 Nov 1984 P85-92. Publ Blacksburg: Virginia Poh'technic Inst and State Linit'. 1984 Major problems arise in multiple horizon mines due to load transfer under remnant pillars. Finite element analysis has been used to model the situation and to study the effects of the difference of material properties between host rock and coal on the stability. Finite element analysis is seen to be a useful, if idealised analytical method. Increasing the ratio of host rock;coal Poisson's ratio gives increased roof stability in upper and lower seams and lower stresses at the edge in the roof and upper floor. Increasing the Young's modulus ratio decreases the maximum compressive stress in pillars and increases the tensile stress in roofs. More advanced modelling techniques could be beneficially used to further study of multi-seam interaction. 864256 Modeling with infinite elements in the study of stress field and heat diffusion at the contour of underground excavations Cravero, M: labichino. G: Carosso, G; Giani. G P In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI. P259-267. Publ Rotterdam: A. A. Balkema. 1985 Two situations which have already been examined by conventional finite element analysis, the stress field around a road tunnel and transient heat conduction at the contour of a haulage drive, are studied by using discretisation with finite and infinite elements. Satisfactory results were achieved and computing time reduced. It is however necessary to know the asymptotic behaviour of the derived solution in order to check
A case study of the New Austrian Tunnelling Method (NATM) for the construction of a double-track railway tunnel through semi-hard dolerite rocks is presented. The Miyana Tunnel can be considered as a forerunner for the NATM application in Japan. The agreement or lack of agreement between the calculated and the measured values is compared for convergences, ground displacements, axial forces in rock bolts and stresses in shotcrete layers. Some characteristics of tunnelling in semi-hard rocks by the NATM arc carefully studied, and the appropriate design systems are introduced for the establishment of safe and economical construction methods. The measured values are generally on the safe side when compared with the calculated values, and it is suggested that the preliminary design of a tunnel in semi-hard rock could be reasonably conceived and carried out by linear elastic numerical analysis using the finite element method. Auth. 864258 Mt Lebanon Tunnel uses the NATM American-style Daly, W; Abramson, L Tunn Tunnlg VI8, NI, Jan 1986, P35-38 The Mt Lebanon tunnel project, two parallel 765m long tunnels near Pittsburg, Pennsylvania. is described. Two options were considered, conventional methods with rock dowel primary support and a cast in situ concrete lining, and NATM. The tunnels were largely driven through hard Waynesburg limestone with interbedded shale and calcareous claystone, but the headings were in weathered, bedded sedimentary rocks. Following an engineering geology survey and evaluation of other tunnels in similar media, the option using NATM was chosen on economic grounds. The completion of the project is described. This is the first successful adaptation of the NATM contractual practices in the USA.
864259 Fuzzy methodology in tunnel support design Fairhurst, C; DezhangLin In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI, P269-278. Publ Rotterdam. A. A. Balkema, 1985 A decision system for tunnel support design allows questions to be posed and answered in relation to the information stored in a tunnel design knowledge base. Typically, such a system possesses an inferential capability and, in particular, has the capability to infer from premises that are imprecise, vague or open-ended. The success of such a system depends on the ability to extract information from geology, rock mechanics and tunnel technology and translate it into a form or forms which help the user make a more intelligent decision for tunnel design. Potential applications of fuzzy methodology to such geological problems are many and include topics such as fuzzy
(' 1986 Pergamon Journals Ltd. Reproduction not permitted
See. 864130
the infinite element. Preparation time may be cut down if infinite elements are used as the model area may be extended without introducing further nodal points. This time saving method may be useful in three dimensional analysis and in the analysis of coupled problems.
Stresses around underground openings
Tunnels
See also. 864168. 864169
See also: 864199, 864200, 864201
864254 Support pressure estimation in failed rock conditions Sheorey, P R Engng Geol V22, N2, Oct 1985, P127-140
864257 Analysis and monitoring of the Miyana railway tunnel constructed using the New Austrian Tunnelling Method Yoshimura, H; Yuki. T; Yamada,Y: Kokubun, N Int J Rock Mech Min Sci V23. N1. Feb 1985. P67-75
Underground Excavations
Ultimate roof support pressure estimates using a modern rock mass classification (Barton et al, 1974) are compared with the observed values in seven cases of squeezing ground. Since the agreement is not good, a modification of the classification method is suggested. An approximate guideline for modifying the classification for obtaining wall support pressures is given. Assuming the failed rock surrounding an underground opening to behave as a Coulomb material, a semi-analytical elastoplastic method is proposed for calculating the ultimate support pressure. This method uses a step-wise gradual change of properties, eliminating the discontinuity and is shown to give reasonable estimates of support pressure if the peak and residual angles of internal friction are chosen from the classification of Bieniawski (1976) and of Barton (I 974), respectively. Auth. 864255 Evaluating some ground control factors in close proximity multi-seam mining Grenoble, A: Haycocks, C: Wu, W Proc 2nd Annual Workshop Generic Mineral Technology Center Mine Systems Design and Ground Control, Reno, Nevada, 12-13 Nov 1984 P85-92. Publ Blacksburg: Virginia Poh'technic Inst and State Linit'. 1984 Major problems arise in multiple horizon mines due to load transfer under remnant pillars. Finite element analysis has been used to model the situation and to study the effects of the difference of material properties between host rock and coal on the stability. Finite element analysis is seen to be a useful, if idealised analytical method. Increasing the ratio of host rock;coal Poisson's ratio gives increased roof stability in upper and lower seams and lower stresses at the edge in the roof and upper floor. Increasing the Young's modulus ratio decreases the maximum compressive stress in pillars and increases the tensile stress in roofs. More advanced modelling techniques could be beneficially used to further study of multi-seam interaction. 864256 Modeling with infinite elements in the study of stress field and heat diffusion at the contour of underground excavations Cravero, M: labichino. G: Carosso, G; Giani. G P In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI. P259-267. Publ Rotterdam: A. A. Balkema. 1985 Two situations which have already been examined by conventional finite element analysis, the stress field around a road tunnel and transient heat conduction at the contour of a haulage drive, are studied by using discretisation with finite and infinite elements. Satisfactory results were achieved and computing time reduced. It is however necessary to know the asymptotic behaviour of the derived solution in order to check
A case study of the New Austrian Tunnelling Method (NATM) for the construction of a double-track railway tunnel through semi-hard dolerite rocks is presented. The Miyana Tunnel can be considered as a forerunner for the NATM application in Japan. The agreement or lack of agreement between the calculated and the measured values is compared for convergences, ground displacements, axial forces in rock bolts and stresses in shotcrete layers. Some characteristics of tunnelling in semi-hard rocks by the NATM arc carefully studied, and the appropriate design systems are introduced for the establishment of safe and economical construction methods. The measured values are generally on the safe side when compared with the calculated values, and it is suggested that the preliminary design of a tunnel in semi-hard rock could be reasonably conceived and carried out by linear elastic numerical analysis using the finite element method. Auth. 864258 Mt Lebanon Tunnel uses the NATM American-style Daly, W; Abramson, L Tunn Tunnlg VI8, NI, Jan 1986, P35-38 The Mt Lebanon tunnel project, two parallel 765m long tunnels near Pittsburg, Pennsylvania. is described. Two options were considered, conventional methods with rock dowel primary support and a cast in situ concrete lining, and NATM. The tunnels were largely driven through hard Waynesburg limestone with interbedded shale and calcareous claystone, but the headings were in weathered, bedded sedimentary rocks. Following an engineering geology survey and evaluation of other tunnels in similar media, the option using NATM was chosen on economic grounds. The completion of the project is described. This is the first successful adaptation of the NATM contractual practices in the USA.
864259 Fuzzy methodology in tunnel support design Fairhurst, C; DezhangLin In: Research and Engineering Applications in Rock Masses (paper to the 26th US Symposium on Rock Mechanics, Rapid City, 26-28 June 1985) VI, P269-278. Publ Rotterdam. A. A. Balkema, 1985 A decision system for tunnel support design allows questions to be posed and answered in relation to the information stored in a tunnel design knowledge base. Typically, such a system possesses an inferential capability and, in particular, has the capability to infer from premises that are imprecise, vague or open-ended. The success of such a system depends on the ability to extract information from geology, rock mechanics and tunnel technology and translate it into a form or forms which help the user make a more intelligent decision for tunnel design. Potential applications of fuzzy methodology to such geological problems are many and include topics such as fuzzy
(' 1986 Pergamon Journals Ltd. Reproduction not permitted