The Experts below are selected from a list of 48522 Experts worldwide ranked by ideXlab platform
Wengang Zhang - One of the best experts on this subject based on the ideXlab platform.
-
MARS Use for Determination of EPB Tunnel-Related Maximum Surface Settlement
MARS Applications in Geotechnical Engineering Systems, 2020Co-Authors: Wengang ZhangAbstract:A major consideration in urban Tunnel Design is to estimate the ground movements and surface settlements associated with the Tunneling operations. Excessive ground movements may result in damage to adjacent buildings and utilities. Numerous empirical and analytical solutions have been proposed to relate the shield Tunnel characteristics and surface/subsurface deformation. Also, numerical analyses, either 2D or 3D, have been used for such Tunneling problems. However, substantially fewer approaches have been developed for earth pressure balance (EPB) Tunneling.
-
determination of earth pressure balance Tunnel related maximum surface settlement a multivariate adaptive regression splines approach
Bulletin of Engineering Geology and the Environment, 2018Co-Authors: Wengang Zhang, Yanmei Zhang, Yang Xiao, Yuzhou XiangAbstract:A major consideration in urban Tunnel Design is to estimate the ground movements and surface settlements associated with the Tunnelling operations. Excessive ground movements may result in damage to adjacent buildings and utilities. Numerous empirical and analytical solutions have been proposed to relate the shield Tunnel characteristics and surface/subsurface deformation. Numerical analyses, either 2D or 3D, have also been applied to such Tunnelling problems. However, substantially fewer approaches have been developed for earth pressure balance (EPB) Tunnelling. Based on instrumented data on ground deformation and shield operation from three separate EPB Tunnelling projects in Singapore, this paper utilizes a multivariate adaptive regression splines (MARS) approach to establish relationships between the maximum surface settlement and the major influencing factors, including the operation parameters, the cover depth and the ground conditions. Since the method has the ability to map input to output patterns, MARS enables one to map all influencing parameters to surface settlements. The main advantages of MARS over other soft computing techniques such as ANN, RVM, SVM and GP are its capacity to produce a simple, easy-to-interpret model, its ability to estimate the contributions of the input variables, and its computational efficiency.
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, 2013Co-Authors: Cyrus D Garne, Richard A CoffmaAbstract: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, 2011Co-Authors: Cyrus D Garne, Richard A CoffmaAbstract: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.
Yuzhou Xiang - One of the best experts on this subject based on the ideXlab platform.
-
determination of earth pressure balance Tunnel related maximum surface settlement a multivariate adaptive regression splines approach
Bulletin of Engineering Geology and the Environment, 2018Co-Authors: Wengang Zhang, Yanmei Zhang, Yang Xiao, Yuzhou XiangAbstract:A major consideration in urban Tunnel Design is to estimate the ground movements and surface settlements associated with the Tunnelling operations. Excessive ground movements may result in damage to adjacent buildings and utilities. Numerous empirical and analytical solutions have been proposed to relate the shield Tunnel characteristics and surface/subsurface deformation. Numerical analyses, either 2D or 3D, have also been applied to such Tunnelling problems. However, substantially fewer approaches have been developed for earth pressure balance (EPB) Tunnelling. Based on instrumented data on ground deformation and shield operation from three separate EPB Tunnelling projects in Singapore, this paper utilizes a multivariate adaptive regression splines (MARS) approach to establish relationships between the maximum surface settlement and the major influencing factors, including the operation parameters, the cover depth and the ground conditions. Since the method has the ability to map input to output patterns, MARS enables one to map all influencing parameters to surface settlements. The main advantages of MARS over other soft computing techniques such as ANN, RVM, SVM and GP are its capacity to produce a simple, easy-to-interpret model, its ability to estimate the contributions of the input variables, and its computational efficiency.
Xuemin Zhang - One of the best experts on this subject based on the ideXlab platform.
-
panoramic image stitching for arbitrarily shaped Tunnel lining inspection
Computer-aided Civil and Infrastructure Engineering, 2016Co-Authors: Jinyang Fu, Junsheng Yang, Xuemin ZhangAbstract:This article presents a low-cost panoramic image stitching system for Tunnel lining inspection. The system can produce a high-quality layout panorama of the target lining using photographs taken freely in a Tunnel with a hand-held camera and the Tunnel Design information as inputs. The three-dimensional (3D) freeform shape corresponding to the Tunnel Design geometry is used as the warping surface for photograph rectification. A newly Designed random sample consensus algorithm is used to estimate the freeform Tunnel shape from the 3D reconstructed point cloud, which can perform the registration between point sets with different sizes. These processes can make full use of the geometry information of a real Tunnel and the reconstructed scene; thus, the photographs can be precisely rectified, and a planar motion stitching can composite them together. Two field applications demonstrate that the system can create a Tunnel layout panorama with sufficient accuracy in Tunnel lining inspection and that it is applicable to noncircular-shaped Tunnels.
Abbas Ghalandarzadeh - One of the best experts on this subject based on the ideXlab platform.
-
Centrifuge experiments for shallow Tunnels at active reverse fault intersection
Frontiers of Structural and Civil Engineering, 2020Co-Authors: Mehdi Sabagh, Abbas GhalandarzadehAbstract:Tunnels extend in large stretches with continuous lengths of up to hundreds of kilometers which are vulnerable to faulting in earthquake-prone areas. Assessing the interaction of soil and Tunnel at an intersection with an active fault during an earthquake can be a beneficial guideline for Tunnel Design engineers. Here, a series of 4 centrifuge tests are planned and tested on continuous Tunnels. Dip-slip surface faulting in reverse mechanism of 60-degree is modeled by a fault simulator box in a quasi-static manner. Failure mechanism, progression and locations of damages to the Tunnels are assessed through a gradual increase in Permanent Ground Displacement (PGD). The ground surface deformations and strains, fault surface trace, fault scarp and the sinkhole caused by fault movement are observed here. These ground surface deformations are major threats to stability, safety and serviceability of the structures. According to the observations, the modeled Tunnels are vulnerable to reverse fault rupture and but the functionality loss is not abrupt, and the Tunnel will be able to tolerate some fault displacements. By monitoring the progress of damage states by increasing PGD, the fragility curves corresponding to each damage state were plotted and interpreted in related figures.
