Geoengineering constructions for use in railways
AssigneeTensar Technologies Limited
InventorMike Horton
Life of this patent
Estimating the term…
Abstract
A railway geogrid construction is suitable for use with high speed trains to mitigate the increased impact of Rayleigh waves generated at high speed and/or over soft subgrades. The construction includes a track bed which defines a track located on a track plane, a mass of particulate material such as an aggregate forming a layer located beneath the track plane, and a geogrid located in and/or below the particulate mass in a geogrid plane substantially parallel to the track plane where the average distance between the track plane and geogrid plane, measured perpendicular to both, is greater than 0.65 metres.
Claims19
A geogrid engineering construction for railways, the construction comprising:
- a track bed which defines a track located on a track plane;
- a particulate layer lying beneath the track plane;
- and
- a geogrid located in and/or adjacent to the particulate layer,
- where the geogrid is located in a geogrid plane substantially parallel to the track plane such that the geogrid stabilizes the particulate layer such that the properties of the particulate layer satisfy Equation 4A;
- 55
- ≥
- (
- A
- +
- Bv
- 1
- +
- v
- )
-
- √
- G
- 0
- ρ
- Equation
-
-
- 4
-
- A
- where
- A is a dimensionless constant;
- B is a dimensionless constant;
- υ denotes the Poisson ratio of the particulate layer;
- G0 is the small strain stiffness property of the particulate layer;
- and
- ρ is density of the particulate layer.
A method for constructing a geogrid engineering construction for railways, the method of construction comprising:
- defining a track plane along which the track bed will be located;
- providing an particulate layer beneath the track plane with a geogrid located in and/or adjacent to the particulate layer,
- where the geogrid is located in geogrid plane substantially parallel to the track plane such that the geogrid stabilizes the particulate layer such that the properties of the particulate layer satisfy Equation 4A;
- 55
- ≥
- (
- A
- +
- Bv
- 1
- +
- v
- )
-
- √
- G
- 0
- ρ
- Equation
-
-
- 4
-
- A
- where
- A is a dimensionless constant;
- B is a dimensionless constant;
- υ denotes the Poisson ratio of the particulate layer;
- G0 is the small strain stiffness property of the particulate layer;
- and
- ρ is density of the particulate layer.
Use of a geogrid in a method to construct a geogrid engineering construction for railways comprising:
- defining a track plane along which the track bed will be located;
- defining a particulate layer lying beneath the track plane with a geogrid located in and/or adjacent to the particulate layer,
- the geogrid being located in a geogrid plane substantially parallel to the track plane such plane being defined such that the geogrid is calculated to stabilize the particulate layer such that the properties of the particulate layer satisfy Equation 4A;
- 55
- ≥
- (
- A
- +
- Bv
- 1
- +
- v
- )
-
- √
- G
- 0
- ρ
- Equation
-
-
- 4
-
- A
- where
- A is a dimensionless constant;
- B is a dimensionless constant;
- υ denotes the Poisson ratio of the particulate layer;
- G0 is the small strain stiffness property of the particulate layer;
- and
- ρ is density of the particulate layer.
Dependencies are inferred from the claim text.