scholarly journals Karst Detection, Prevention and Correction: A Case Study along the Riyadh Metro Line 3 (Saudi Arabia)

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1429 ◽  
Author(s):  
Manuel Cueto ◽  
Pablo de la Puente ◽  
Carlos López-Fernández ◽  
Luis Pando ◽  
Daniel Arias
Keyword(s):  
Electrical Resistivity ◽  
Saudi Arabia ◽  
Preventive Measures ◽  
Seismic Refraction ◽  
Comprehensive Investigation ◽  
Urban Transit ◽  
Transit System ◽  
Cavity Filling ◽  
Metro Project

In the framework of the largest urban-transit system ever built from scratch, the Riyadh Metro Project (6 lines totaling 176 km), a comprehensive investigation was carried out for karst detection, prevention and correction. This case study of the Metro Line 3 (41.6 km) seeks to show how the multi-technique geophysical survey (seismic refraction, electrical resistivity and ground penetration radar down to 40–50 m depth) was found to be a successful tool in detecting karst features. Preventive measures included systematic probing drilling to anticipate karst cavities below foundations (653 piers) and tunnel lining evaluation using 2D finite elements. Finally, this paper provides initial guidance of the corrective techniques used for each engineering challenge, such as cavity filling with grouting, geogrid reinforcement, etc.

scholarly journals A Viability Study for Implementing Monorail as a Transit System for Urban Arterial Road: A Case Study of Ahmedabad.

10.29007/gbh7 ◽  
2018 ◽  
Author(s):  
Rewati Marathe
Keyword(s):  
Transport System ◽  
Public Transport ◽  
Public Transportation ◽  
Urban Transit ◽  
Transit System ◽  
Public Transport System ◽  
Arterial Road ◽  
Mode Of Transport ◽  
Public Transportation Planning

The aim of this study is to investigate an novel mode of transportation from Sarkhej Circle Ahmedabad to Pathika Gandhinagar i.e. arterial road and how this system will be viable to four basic criteria: Technically, Economically, safety and Ecofriendly. This study gives modern concepts of a single rail serving as a track for passenger or freight vehicles, gives information about land use and public transportation planning, speed and movement. Monorail vehicles havebenefited from modern transit technology.The purpose of this Study is to investigate the viability of monorail as a new urban transit option along a corridor under study of section Sarkhej circle to Gandhinagar. The study is to determine that ―Monorail‖ a fixed guideway technology known ―Automated Guideway Transit‖ be a sustainable transport system which provide mobility and accessibility to all urban residents in a safe and environment friendly mode of transport. One alternative with the development of modern public transport system is monorail. A monorail as public transport very helpful for people in their daily activities also reduces the use of private vehicles and to reduce environmental pollution i.e. ecofriendly.

scholarly journals Method for Determining Longitudinal Stiffness of Combined Double Thin-Walled Pier Based on Train-Track-Bridge Interaction

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hui Fang ◽  
Zhaowei Chen
Keyword(s):  
Train Track ◽  
Urban Transit ◽  
Transit System ◽  
Limit Values ◽  
Longitudinal Stiffness ◽  
Practical Engineering ◽  
Thin Walled ◽  
Track Bridge ◽  
The Relationship

Combined double thin-walled pier is a new kind of pier adopted in the urban transit system in China, whose longitudinal stiffness cannot be determined by adopting traditional methods. Aiming at this practical issue, this work proposed an alternative method for determining the longitudinal stiffness of the combined double thin-walled pier based on the train-track-bridge interaction. Primarily, the relationship between longitudinal stiffness of the pier and rail stress is underlined, based on which the proposed methodology is described in detail. Finally, a case study is conducted to validate the effectiveness of the proposed method. Results show that the train-track-bridge dynamic interaction theory is effective in determining the longitudinal stiffness of the newly designed and special pier. Rail stress and longitudinal displacement of pier top exceed their limit values with the change of pier longitudinal stiffness. The dynamic stress and thermal stress of rail are the two most important indicators in determining pier longitudinal stiffness, which should be paid attention to in practical engineering.

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