Time filter

Source Type

Ghiasi V.,University Putra Malaysia | Ghiasi V.,University of Malayer | Omar H.,University Putra Malaysia | Yusoff Z.B.M.,University Putra Malaysia | And 11 more authors.
Scientific Research and Essays | Year: 2011

Public transport connectivity is defined as the ability to provide service to a maximum of trips through the optimal integration of lines, schedules, fare systems, information systems and modal transport facilities. Main interchange and big transfer stations are important factors in network connectivity. One of the objectives of this paper is defining the various types of interchange and transfer stations. Specifying the differences between these two is another aim of this paper. Finally, the process of locating interchange and transfer stations is discussed as the most important factor in network connectivity. Case study of Tehran urban rail network and the location of interchange and transfer stations is presented as an example of rail network connectivity. © 2011 Academic Journals.


Ghiasi V.,University Putra Malaysia | Ghiasi V.,Tehran Urban and Suburban Railway Company TUSRC | Ghiasi V.,University of Malayer | Omar H.,University Putra Malaysia | And 6 more authors.
ISEC 2011 - 6th International Structural Engineering and Construction Conference: Modern Methods and Advances in Structural Engineering and Construction | Year: 2011

Iran is a vast country with 1.6m square kilometer area and more than 70 million inhabitants. Tehran, the capital of Iran, together with its satellite townships is home to more than one sixth of the country's population which make over 13 million mostly motorized daily journeys. This work is based on geotechnical investigation a metro station case study in Tehran. The access gallery and tunnel inter-section problems is very sensitive and dangerous in critical zones of the tunnel lining has been discussed in this paper. One of the objectives of this paper is defining the seismic modeling of tunnel. Specifying the differences between the two PLAXIS and FLAC seismic modeling is another aim of this paper. Copyright © 2011 by Research Publishing Services.


Ghiasi V.,University Putra Malaysia | Omar H.,University Putra Malaysia | Rostami J.,Pennsylvania State University | Yusoff Z.B.,University Putra Malaysia | And 3 more authors.
Scientific Research and Essays | Year: 2011

In this paper, a detailed geomechanical investigation of rock masses of North Water Convey Tunnel (NWCT) and its stability analysis has been carried out. The NWCT is located in the north of Iran and is to be constructed in-order to convey water for agriculture purposes. The main instability in the tunnel is joints and faults. The rocks mass encountered in the tunnel route are made of argillaceous, sandstone and shale. The tunnel has been divided into two parts, lot1 and lot2 having a length of 14 km and 26 km respectively. It is proposed to be constructed by telescopic shield method using a tunnel boring machine (TBM). In this study, the most suitable methods are utilized for the stability analysis and design of support of the tunnel. For the empirical investigation, the rock mass were classified based on RMR, Q, RSR, GSI and Rmi systems. The geomechanical properties of the rock mass were determined from the laboratory and field investigations. The results obtained from the analysis show that the tunnel is highly unstable due to the presence of a fault and hence strong supports are need in these regions. The support system used is concrete lining, as the tunnel in used for water conveyance. The tunnel alignment in lot1 is divided into 12 lithology types as; LI-SH1, LI-SH2, LI-SH3, LI-SH4, LI1, LI2, LI3, LI4, LI5, SI, CZ and FZ regions. Similarly, the tunnel alignment in lot2 is divided into 21 lithology types as; SH-ML1, SH-ML2, SH-ML3, MLI-SH1, ML-SH2, ML-SH3, ML-SH4, ML-SH5, SH-LS1, SH-LS2, SH-LS3, SH-LS4, LI2, LI3, LI4, LI5, LI6, LI-MA, LI-SH, CZ, FZ regions. A stability analysis is a necessity as during the tunneling instabilities, such as the presence of a shear zones, may cause an obstruction and delaying of TBM progressing rate. © 2011 Academic Journals.


Ghiasi V.,University Putra Malaysia | Omar H.,University Putra Malaysia | Huat B.K.,University Putra Malaysia | Ghiasi S.,Tehran Urban and Suburban Railway Company TUSRC
Scientific Research and Essays | Year: 2011

Iran is a vast country with 1.6 million square kilometer area and more than 70 million inhabitants. Tehran, the capital of Iran, together with its satellite townships is home to more than one sixth of the country's population which make over 13 million, and mostly make motorized daily journeys. This work is based on the case study geotechnical investigation of a metro station in Tehran. The access gallery and tunnel inter-section problem is very sensitive and dangerous in critical zones and the necessity of the provision of tunnel lining has been discussed in this paper. This study is a concise case study which highlights the important soil parameters for designing of deep and shallow tunnels and substations. It shows the critical area for performance of tunnel intersection of and access galleries and the method to avoid collapse of the tunnel and access galleries while tunneling with a high safety. If boring of the access gallery and tunnel station, is made at the same time or the boring of the access gallery is carried out before the tunneling lining, the tunnel will be overburdened with loads leading to weakening of the access galleries crown, and its immediate collapse. One of the objectives of this paper is defining the seismic modeling of tunnel. Specifying the differences in seismic modeling using two softwares, PLAXIS and FLAC is another aim of this paper. © 2011 Academic Journals.


Ghiasi V.,University Putra Malaysia | Omar H.,University Putra Malaysia | Huat B.K.,University Putra Malaysia | Muniandy R.,University Putra Malaysia | And 2 more authors.
14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering | Year: 2011

Increasing traffic congestion in urban areas and growing land values in the large cities make underground structures increasingly attractive for highways and transit compared to other options. A tunnel can preserve the land above for parks, buildings, homes, and other uses while providing an efficient, cost-effective underground corridor to move people and goods. Planning approach to manage the main issues will be happen in tunnel transportation are provided on appendix of this paper. this research provided to tunnel project management and illustrated how the underground transportation play the main role in urban transportation therefore understanding of the basic and global issues take place to tunnel appear to tunnel project management and tunnel designers. The finding believes to be valuable for tunnel designers and urban planners therefore they can adopt to tunnel management, risk management and risk assessment in current planning or future tunnel projects.


Montazeri M.,Tehran Urban and Suburban Railway Co. TUSRC
Public Transport International | Year: 2010

Greater Tehran is currently one of the most populated mega cities in the world with an estimated 14 million inhabitants and 13 million daily motorized trips. Improving public transport has become crucial in Tehran at a time when the increasing road congestion is jeopardizing air quality and the economic profitability of the city workforce.

Loading Tehran Urban and Suburban Railway Company TUSRC collaborators
Loading Tehran Urban and Suburban Railway Company TUSRC collaborators