The Experts below are selected from a list of 4140 Experts worldwide ranked by ideXlab platform
E.c. Kalkani - One of the best experts on this subject based on the ideXlab platform.
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Stress analysis and hoop reinforcement for a tailrace tunnel Concrete Lining
Computers & Structures, 1991Co-Authors: E.c. KalkaniAbstract:Abstract Stress analysis in the Concrete Lining of a tailrace tunnel is studied to evaluate the required hoop reinforcement. From the hoop stresses along the faces of the Concrete Lining, the normal forces, bending moments and the required hoop reinforcement are calculated. The analysis is performed to assess the minimum required hoop reinforcement in the Concrete Lining.
Young-chul Hwang - One of the best experts on this subject based on the ideXlab platform.
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A study on the treatment of external water pressure for the water pressure tunnel at the structural analysis of Concrete Lining
Journal of Korean Tunnelling and Underground Space Association, 2015Co-Authors: Young-chul HwangAbstract:ABSTRACT: When the structural analysis is performed for the Concrete Lining of the water pressure tunnel, many parameters are considered such as relaxed ground loads, internal water pressure, external water pressure, the shrinkage of the Concrete Lining, grouting pressure, etc. But, there are no standards and manuals for the structural analysis for the Concrete Lining of the water pressure tunnel. Above all, the external water pressure has an much effect on the stability of tunnel. So, in case that permeability of ground is large, the external water pressure should be decreased by installation of weep hole, or reinforced ground by ground improvement grouting should be pressed by the external water pressure instead. But, when weep hole is installed to reduce the external water pressure, the many problems may me occurred. Thus, reasonable approach for treatment of the external water pressure is necessary if weep hole is not installed. Therefore, the purpose of this study is to analyze design cases and studies for treatment of the external water pressure in performing structural analysis for the Concrete Lining of the water pressure tunnel, and to find reasonable method for tunnel Lining modeling which is the treatment of the external water pressure according to permeability of ground and consequently the design of ground improvement grouting.Keywords: Water pressure tunnel, Weep hole, Concrete Lining modeling, External water pressure, Internal water pressure
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A study on the treatment of external water pressure for the water pressure tunnel at the structural analysis of Concrete Lining
Journal of Korean Tunnelling and Underground Space Association, 2015Co-Authors: Young-chul HwangAbstract:ABSTRACT: When the structural analysis is performed for the Concrete Lining of the water pressure tunnel, many parameters are considered such as relaxed ground loads, internal water pressure, external water pressure, the shrinkage of the Concrete Lining, grouting pressure, etc. But, there are no standards and manuals for the structural analysis for the Concrete Lining of the water pressure tunnel. Above all, the external water pressure has an much effect on the stability of tunnel. So, in case that permeability of ground is large, the external water pressure should be decreased by installation of weep hole, or reinforced ground by ground improvement grouting should be pressed by the external water pressure instead. But, when weep hole is installed to reduce the external water pressure, the many problems may me occurred. Thus, reasonable approach for treatment of the external water pressure is necessary if weep hole is not installed. Therefore, the purpose of this study is to analyze design cases and studies for treatment of the external water pressure in performing structural analysis for the Concrete Lining of the water pressure tunnel, and to find reasonable method for tunnel Lining modeling which is the treatment of the external water pressure according to permeability of ground and consequently the design of ground improvement grouting.Keywords: Water pressure tunnel, Weep hole, Concrete Lining modeling, External water pressure, Internal water pressure
Wang Jianyu - One of the best experts on this subject based on the ideXlab platform.
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The evaluation of thermal stress of Concrete Lining in tunnel
2009Co-Authors: Wang JianyuAbstract:Engineering practice has proved temperature change of season could cause thermal deformation of Concrete Lining.Under thermal deformation,thermal stress is come into being in Lining Concrete,and this stress is one of important factors of cracking in Concrete Lining.So this paper deduced the calculation formula of thermal stress in Lining Concrete by applying "Duhamel similitude" theory and elastic theory to instruct design and construction of Concrete Lining.
Yang Dong - One of the best experts on this subject based on the ideXlab platform.
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Selection of Wall Rock Thickness for Thermal Stress Analysis of Circular Tunnel Concrete Lining
Journal of Engineering Mechanics, 2013Co-Authors: Fupin Dong, Yang DongAbstract:AbstractWhen the thermal stress in the Concrete Lining of a spillway tunnel is computed using the finite-element method, the wall rock in the numerical model is generally taken to be a finite size. The selection of the thickness of the wall rock has a significant impact on the computational results for the thermal deformation and thermal stress in the Concrete Lining. The current study investigated the effect of the wall rock thickness on the thermal deformation and thermal stress in the Concrete Lining. A formula was derived for calculating the thermal displacement in an infinitely long, thick-walled cylinder, with the displacement being used as the outer boundary condition and the stress as the inner boundary condition. A formula was also derived for calculating the thermal displacement at the interface between the Concrete Lining and the wall rock of the circular tunnel. To reduce the influence of the wall rock thickness on the calculation accuracy, a method was developed for selecting the outer radius...
Bo Wang - One of the best experts on this subject based on the ideXlab platform.
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Calculation of Thermal Stress of Thick Arch Concrete Lining of Tunnel of Big Span
Applied Mechanics and Materials, 2011Co-Authors: Mei Rong Jiang, Bo WangAbstract:To control thermal cracks of Concrete of thick arch Lining of tunnel of big pan, based on basic assumption, the formula calculating thermal stress of arbitrary position and the maximal stress in arch Lining restricted by surrounding rock is deduced. Moreover, the formula of thermal stress of arbitrary position, the maximal thermal stress is also presented, when the thick of arch Lining varies according to the law of cosine. The change of temperature of Concrete of arch Lining in practical engineering is monitored. The maximal thermal stress in arch crown surface and the thermal stress in surface along the axis of arch are calculated using the formula deduced above is presented and is contrasted with its real strength. Conclusions show that the thermal stress in arch crown is the maximal stress, Concrete Lining do not crack under the condition of thermal stress less than its strength.