The Experts below are selected from a list of 1668 Experts worldwide ranked by ideXlab platform

Richard A Coffma - One of the best experts on this subject based on the ideXlab platform.

  • subway tunnel design using a ground surface settlement profile to characterize an acceptable configuration
    Tunnelling and Underground Space Technology, 2013
    Co-Authors: Cyrus D Garne, Richard A Coffma
    Abstract:

    Abstract Tunneling induced settlement is often a controlling factor in the design of a subway or underground facility due to the impact on adjacent or overhead infrastructure. A method is proposed that uses an acceptable ground surface settlement profile to generate a tunnel system configuration that reproduces the acceptable/tolerable settlement profile. A brief discussion of existing methods of tunnel settlement analysis and two (2) case studies illustrating the proposed method are presented. The chosen case studies are urban subgrade Rail Tunnels (subways) constructed in Istanbul, Turkey and Bangkok, Thailand. Each case study is used to illustrate the use of the bifurcated static back calculation – iterative finite element model prediction/solution method. The initial settlement profiles used for both case histories were measured settlement profiles obtained from the literature ( Ercelbi et al., 2005 , Suwansawat, 2002 ). These settlement profiles were assumed to be the tolerable settlement profiles for the subway systems. For each case history, the iterative static back calculation – finite element model ingested the individual literature obtained design settlement profile to identify an optimum tunnel configuration (depth and size) that will reproduce the design settlement profile. Comparisons were made between the as-built tunnel configuration and the tunnel configuration predicted using the proposed method.

  • subway tunnel design using a ground surface settlement profile to characterize an acceptable configuration
    Transportation Research Board 90th Annual MeetingTransportation Research Board, 2011
    Co-Authors: Cyrus D Garne, Richard A Coffma
    Abstract:

    Tunneling induced settlement is often a controlling factor in the design of a subway or underground facility due to the impact on adjacent or overhead infrastructure. A method that takes an acceptable ground surface settlement profile and relates it to a tunnel or tunnel system configuration that will produce an acceptable/tolerable settlement profile is proposed. Also included in this paper is a brief discussion of existing methods of tunnel settlement analysis as well as two (2) case studies illustrating the proposed method. The chosen case studies are urban subgrade Rail Tunnels (subways) constructed in Istanbul, Turkey and Bangkok, Thailand. Each case study illustrates the use of the iterative static back calculation - finite element model prediction/solution method. The initial settlement profiles used for both case histories were literature obtained measured settlement profiles. These settlement profiles were assumed to be the tolerable settlement profiles for the subway systems. For each case history, the iterative static back calculation – finite element model ingested the individual literature obtained design settlement profile to identify an optimum tunnel configuration (depth and size) that will reproduce the design settlement profile. Comparisons were made between the as-built tunnel configuration and the predicted tunnel configuration.

Jørn Grøndal - One of the best experts on this subject based on the ideXlab platform.

  • Possible Concepts for Waterproofing of Norwegian TBM Railway Tunnels
    Rock Mechanics and Rock Engineering, 2014
    Co-Authors: Øyvind Dammyr, Bjørn Nilsen, Kurosch Thuro, Jørn Grøndal
    Abstract:

    The aim of this paper is to evaluate and compare the durability, life expectancy and maintenance needs of traditional Norwegian waterproofing concepts to the generally more rigid waterproofing concepts seen in other European countries. The focus will be on solutions for future Norwegian tunnel boring machine Railway Tunnels. Experiences from operation of newer and older Tunnels with different waterproofing concepts have been gathered and analyzed. In the light of functional requirements for Norwegian Rail Tunnels, some preliminary conclusions about suitable concepts are drawn. Norwegian concepts such as polyethylene panels and lightweight concrete segments with membrane are ruled out. European concepts involving double shell draining systems (inner shell of cast concrete with membrane) and single shell undrained systems (waterproof concrete segments) are generally evaluated as favorable. Sprayable membranes and waterproof/insulating shotcrete are welcomed innovations, but more research is needed to verify their reliability and cost effectiveness compared to the typical European concepts. Increasing traffic and reliance on public transport systems in Norway result in high demand for durable and cost effective solutions.

  • Possible Concepts for Waterproofing of Norwegian TBM Railway Tunnels
    Rock Mechanics and Rock Engineering, 2014
    Co-Authors: Øyvind Dammyr, Bjørn Nilsen, Kurosch Thuro, Jørn Grøndal
    Abstract:

    The aim of this paper is to evaluate and compare the durability, life expectancy and maintenance needs of traditional Norwegian waterproofing concepts to the generally more rigid waterproofing concepts seen in other European countries. The focus will be on solutions for future Norwegian tunnel boring machine Railway Tunnels. Experiences from operation of newer and older Tunnels with different waterproofing concepts have been gathered and analyzed. In the light of functional requirements for Norwegian Rail Tunnels, some preliminary conclusions about suitable concepts are drawn. Norwegian concepts such as polyethylene panels and lightweight concrete segments with membrane are ruled out. European concepts involving double shell draining systems (inner shell of cast concrete with membrane) and single shell undrained systems (waterproof concrete segments) are generally evaluated as favorable. Sprayable membranes and waterproof/insulating shotcrete are welcomed innovations, but more research is needed to verify their reliability and cost effectiveness compared to the typical European concepts. Increasing traffic and reliance on public transport systems in Norway result in high demand for durable and cost effective solutions.

Cyrus D Garne - One of the best experts on this subject based on the ideXlab platform.

  • subway tunnel design using a ground surface settlement profile to characterize an acceptable configuration
    Tunnelling and Underground Space Technology, 2013
    Co-Authors: Cyrus D Garne, Richard A Coffma
    Abstract:

    Abstract Tunneling induced settlement is often a controlling factor in the design of a subway or underground facility due to the impact on adjacent or overhead infrastructure. A method is proposed that uses an acceptable ground surface settlement profile to generate a tunnel system configuration that reproduces the acceptable/tolerable settlement profile. A brief discussion of existing methods of tunnel settlement analysis and two (2) case studies illustrating the proposed method are presented. The chosen case studies are urban subgrade Rail Tunnels (subways) constructed in Istanbul, Turkey and Bangkok, Thailand. Each case study is used to illustrate the use of the bifurcated static back calculation – iterative finite element model prediction/solution method. The initial settlement profiles used for both case histories were measured settlement profiles obtained from the literature ( Ercelbi et al., 2005 , Suwansawat, 2002 ). These settlement profiles were assumed to be the tolerable settlement profiles for the subway systems. For each case history, the iterative static back calculation – finite element model ingested the individual literature obtained design settlement profile to identify an optimum tunnel configuration (depth and size) that will reproduce the design settlement profile. Comparisons were made between the as-built tunnel configuration and the tunnel configuration predicted using the proposed method.

  • subway tunnel design using a ground surface settlement profile to characterize an acceptable configuration
    Transportation Research Board 90th Annual MeetingTransportation Research Board, 2011
    Co-Authors: Cyrus D Garne, Richard A Coffma
    Abstract:

    Tunneling induced settlement is often a controlling factor in the design of a subway or underground facility due to the impact on adjacent or overhead infrastructure. A method that takes an acceptable ground surface settlement profile and relates it to a tunnel or tunnel system configuration that will produce an acceptable/tolerable settlement profile is proposed. Also included in this paper is a brief discussion of existing methods of tunnel settlement analysis as well as two (2) case studies illustrating the proposed method. The chosen case studies are urban subgrade Rail Tunnels (subways) constructed in Istanbul, Turkey and Bangkok, Thailand. Each case study illustrates the use of the iterative static back calculation - finite element model prediction/solution method. The initial settlement profiles used for both case histories were literature obtained measured settlement profiles. These settlement profiles were assumed to be the tolerable settlement profiles for the subway systems. For each case history, the iterative static back calculation – finite element model ingested the individual literature obtained design settlement profile to identify an optimum tunnel configuration (depth and size) that will reproduce the design settlement profile. Comparisons were made between the as-built tunnel configuration and the predicted tunnel configuration.

Øyvind Dammyr - One of the best experts on this subject based on the ideXlab platform.

  • Possible Concepts for Waterproofing of Norwegian TBM Railway Tunnels
    Rock Mechanics and Rock Engineering, 2014
    Co-Authors: Øyvind Dammyr, Bjørn Nilsen, Kurosch Thuro, Jørn Grøndal
    Abstract:

    The aim of this paper is to evaluate and compare the durability, life expectancy and maintenance needs of traditional Norwegian waterproofing concepts to the generally more rigid waterproofing concepts seen in other European countries. The focus will be on solutions for future Norwegian tunnel boring machine Railway Tunnels. Experiences from operation of newer and older Tunnels with different waterproofing concepts have been gathered and analyzed. In the light of functional requirements for Norwegian Rail Tunnels, some preliminary conclusions about suitable concepts are drawn. Norwegian concepts such as polyethylene panels and lightweight concrete segments with membrane are ruled out. European concepts involving double shell draining systems (inner shell of cast concrete with membrane) and single shell undrained systems (waterproof concrete segments) are generally evaluated as favorable. Sprayable membranes and waterproof/insulating shotcrete are welcomed innovations, but more research is needed to verify their reliability and cost effectiveness compared to the typical European concepts. Increasing traffic and reliance on public transport systems in Norway result in high demand for durable and cost effective solutions.

  • Possible Concepts for Waterproofing of Norwegian TBM Railway Tunnels
    Rock Mechanics and Rock Engineering, 2014
    Co-Authors: Øyvind Dammyr, Bjørn Nilsen, Kurosch Thuro, Jørn Grøndal
    Abstract:

    The aim of this paper is to evaluate and compare the durability, life expectancy and maintenance needs of traditional Norwegian waterproofing concepts to the generally more rigid waterproofing concepts seen in other European countries. The focus will be on solutions for future Norwegian tunnel boring machine Railway Tunnels. Experiences from operation of newer and older Tunnels with different waterproofing concepts have been gathered and analyzed. In the light of functional requirements for Norwegian Rail Tunnels, some preliminary conclusions about suitable concepts are drawn. Norwegian concepts such as polyethylene panels and lightweight concrete segments with membrane are ruled out. European concepts involving double shell draining systems (inner shell of cast concrete with membrane) and single shell undrained systems (waterproof concrete segments) are generally evaluated as favorable. Sprayable membranes and waterproof/insulating shotcrete are welcomed innovations, but more research is needed to verify their reliability and cost effectiveness compared to the typical European concepts. Increasing traffic and reliance on public transport systems in Norway result in high demand for durable and cost effective solutions.

C. Gokceoglu - One of the best experts on this subject based on the ideXlab platform.

  • Using 3D Numerical Analysis for the Assessment of Tunnel–Landslide Relationship: Bahce–Nurdag Tunnel (South of Turkey)
    Geotechnical and Geological Engineering, 2020
    Co-Authors: M. P. Komu, U. Guney, T. E. Kilickaya, C. Gokceoglu
    Abstract:

    Owing to the increase in population, transportation has become one of the major research topics. Among existing transportation systems, Railway is one of the most economic and fast systems, and therefore, there has been an increase in new Railway constructions in recent years. In Turkey, the longest Railway Tunnels, the Bahce–Nurdag high-speed Rail Tunnels, are under construction in the southern part of the country. This twin tubes Tunnels are approximately 10 km in length, and they are excavated using tunnel boring machines (TBM). The tunnel route locates in the East Anatolian Fault Zone and the portal region is composed of debris and old landslide deposits. For this reason, mitigating the potential landslide hazard is critical for the tunnel. Therefore, the present study investigates the TBM tunnelling–landslide relationship by employing 3D numerical analyses. The analyses show that the last 600 m of the tunnel has a potential landslide hazard and some additional measures should be considered along this part to ensure tunnel safety. The tunnel conditions are highly complex, and thus it is an interesting case for tunnel engineers.