Category: Education/Training Publisher: The Lavenham Press
Pages: 315
Copyright: January 2015
A comprehensive guide to geotechnical engineering for railway track engineers.
This book is an essential introduction to the theory and practice of railway trackbed engineering in the UK.
It gives the reader knowledge and understanding with practical experience and innovation on how the railway trackbed interacts with the track structure and the adjacent environment.
The book is aimed at people new to the rail industry and also a guide for the more experienced track engineers.
The textbook was commissioned by the Permanent Way Institution (PWI): the PWIis the professional body in the UK and internationally that is solely dedicated to the advancement of the knowledge of railway infrastructure and promoting the sharing of best practice worldwide.
Excerpt
1.1 INTRODUCTION
Geotechnical engineering is a key component of any civil engineering project. The science of geotechnics, the study of soils beneath the surface of the ground, is often an undervalued element of the overall track construction process, yet is the pivotal point around which long-term good track quality for any section of line is based. It is essential that the track or permanent way (p-way) engineer understands the relationship between the substrata, subgrade and trackbed, and their impact on the track structure. Failure to appreciate the impact different types of subgrade and subgrade conditions can have on the life cycle of a trackbed and track structure could result in inherent poor track quality, for example poor top, poor alignment or even settlement issues.
Figure 1.1a and 1.1b illustrate the different sections of a typical track structure and trackbed arrangement.
Issues associated with the formation centre around the bearing capacity of the subgrade, on to which the trackbed layers and track structure are constructed. A poor performing subgrade will result in poor track quality issues. Provided the subgrade and trackbed layers work together to produce an overall adequate bearing capacity, which is not retaining water, either ground or run-off, and provided the track structure is constructed correctly, there should be no significant track quality issues.
It is up to the track engineer to assess the quality and condition of the subgrade and to determine the correct treatment to apply, in order to achieve the correct bearing capacity, prior to placing the ballast.
Therefore, in order to be able to make that assessment the track engineer needs to be able to know how the ground conditions can be determined, what formation treatments are available, and most importantly, which formation treatment to apply. This is achieved through adequate Trackbed Investigation (TBI) with the results being obtained and assessed alongside Infrastructure Survey (IS) information.
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