On a railway track with rail lengths of 12.8m sufficient depth of ballast needs to be provided. Calculate the minimum depth of the ballast (in cm.) if sleeper density provided is n+7 and the width of the sleepers used is 25cm.

On a railway track with rail lengths of 12.8m sufficient depth of ballast needs to be provided. Calculate the minimum depth of the ballast (in cm.) if sleeper density provided is n+7 and the width of the sleepers used is 25cm.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter14: Sheet-pile Walls

Section: Chapter Questions

Problem 14.12P

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Concept explainers

Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.

Question

On a railway track with rail lengths of
12.8m sufficient depth of ballast
needs to be provided. Calculate the
minimum depth of the ballast (in cm.)
if sleeper density provided is n+7 and
the width of the sleepers used is
25cm.

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