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Improving the Maintenance Productivity of RAJA Passenger Train CO
, M.Sc. Thesis Sharif University of Technology ; Kumar, Edi (Supervisor) ; Barabadi, Javad (Supervisor)
Design of Optimum Railroad Alignments Using Ant Colony Optimization
,
M.Sc. Thesis
Sharif University of Technology
;
Shafahi, Yousef
(Supervisor)
Abstract
Optimum railroad alignment, which can be categorized into continuous problems, has been a conundrum for engineers because of two reasons: At the first, there is a wide variety of information that is necessary for finding optimum one. Secondly, the major costs of a railway, such as length-dependent, traffic-dependent, volume-dependent and location-dependent are affected by the numerous factors so that, it may be difficult to formulate them. In order to solve large scale continuous optimization problems, there are two approaches: firstly, such problems may be tackled with a combinatorial optimization algorithm, e.g. ant colony optimization (ACO), by the continuous range of allowed values are...
Probabilistic Stability Analysis of a Railway Embankment on Dispersive Strata Subjected to Periodic Rainfall Conditions with Various Patterns
, M.Sc. Thesis Sharif University of Technology ; Ahmadi, Mohammad Mehdi (Supervisor)
Abstract
The importance of rainfall pattern in assessing embankment stability and deformation is widely known. However, many studies have examined an embankment with simple rainfall patterns or used average and maximum ones. The importance of diverse rainfall patterns has also been overlooked in the study of divergent soil stability in the previous study. Therefore, the hydraulic properties of a natural soil with and without salinity potential and the stability analysis of the railway embankment located on this type of soil under various rainfall patterns are investigated. The study area is part of the Zahedan Chabahar National Railway Project, which is located on divergent soil and has high...
Dem Simulation of Triaxial Tests on Coarse Aggregates Applicable for Base and Sub-Base of Roads and Railways
, M.Sc. Thesis Sharif University of Technology ; Pak, Ali (Supervisor)
Abstract
In this study, numerical modeling of the micromechanical behavior of gravel aggregates applicable for base and sub-base of roads and railways under triaxial compression tests is conducted. The material is a type of well-graded gravelly soil with a maximum particle size of 20 mm, whose application is recommended by the UK Highways Agency. The prominent role of this material in the performance and endurance of the roads shows the importance of studying its behavior to acquire a better understanding of its mechanical properties. A number of triaxial tests using monotonic and cyclic loadings have been performed in the laboratory to investigate the behavior of this type of material. In the...