发现很好的资料对于我们了解铁路路基设计
Contents
i) Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
ii) Typical Track Structure Components
a) Ballast material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
b) Functions of ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
c) Sub-ballast material (alternatively ‘Blanket’). . . . . . . . . . . . . . . . . . . 5
d) Functions of sub-ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
iii) Ground Investigation
a) The need for a Ground Investigation. . . . . . . . . . . . . . . . . . . . . . . . . 7
b) Methods of Ground Investigation . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
c) Field identification and description of soils . . . . . . . . . . . . . . . . . . 8
iv) Terram PW1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Geotextile used as an alternative to sub-ballast over:
a) cohesive soils (i.e. clays, silts), mudstones & shales etc…
b) fine soils (> 35% silt & clay with <65% sand & gravel)
c) granular soil (i.e. sand and gravel)
d) coarse soils (< 35% silt & clay with >65% sand & gravel)
v) Terram PW2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
‘Drainage enhancing’ high strength composite most effective
over coarse or granular sub-grade soils e.g. old track bed.
vi) Terram PW3 and PW3.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
‘Impermeable’ composites most effective over sub-grades
prone to ‘pumping’ failure.
vii) Terram PW4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
‘Reinforced’ composite used to improve track life and reduce
deflection by stiffening ballast over low bearing capacity ground.
viii)Terram PW5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
‘Radar detectable’ geotextile enabling accurate radar
surveys of track beds, drainage pipe lines etc.
(Coming soon – check for availability – August 01)
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