Stress–dilatancy relationship for railway ballast Cover

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Stress–dilatancy relationship for railway ballast

Studia Geotechnica et Mechanica

Volume 40 (2018): Issue 2 (October 2018)

By: Katarzyna Dołżyk-Szypcio

Open Access

|Oct 2018

Figures & Tables

Scheme of stress ratio–plastic dilatancy relationship.

Relationships for dry scaled ballast: (a) q–εa; (b) ευ–εa; (c) Gs–εa; and (d) η–Dp.

Relationships for saturated scaled ballast: (a) q–εa; (b) ευ–εa; (c) Gs–εa; and (d) η–Dp.

Relationships for fouled ballast at 4% water content: (a) q–εa; (b) ευ–εa; (c) Gs–εa; and (d) η–Dp.

Relationships for fouled ballast at 4% and 12% water contents: (a) q–εa; (b) ευ–εa; (c) Gs–εa; and (d) η–Dp.

Experimental conditions and elastic parameters of scaled railway ballast_

σ_c	w	e_o	κ	ν
[kPa]		[–]	[–]	[–]
15	Dry	0.774	0.0027	0.30
25		0.801	0.0027	0.30
60		0.759	0.0027	0.30
115		0.771	0.0027	0.30
200		0.774	0.0027	0.30
15	Saturated	0.787	0.0027	0.30
20		0.781	0.0027	0.30

Characteristic points and stress–dilatancy parameters for fouled railway ballast_

σ_c	w	ε_a [%]			Parameters α and β
[kPa]	[%]	Y₁	Y₂	F	α₁	β₁	α₂	β₂	α₃	β₃
30	4.0	0.16	0.70	3.0	–0.80	1.50	–0.90	1.00	0.00	2.20
100	4.0	0.05	1.00	6.0	–1.60	4.00	–0.70	0.60	0.00	2.20
200	4.0	0.05	1.00	10.0	–0.90	3.40	–0.08	1.50	0.00	2.20
400	4.0	0.05	1.50	10.5	–1.70	3.20	0.00	1.20	0.00	1.20
100	12.0	0.05	0.65	10.5	–1.50	5.70	0.00	1.90	0.00	1.90
400	12.0	0.05	1.60	–	–2.30	3.40	0.00	1.30	–	–

Experimental conditions and elastic parameters of fouled railway ballast_

σ_c	w	e_o	κ	ν
[kPa]		[–]	[–]	[–]
30	4.0	0.350	0.0013	0.27
100	4.0	0.350	0.0015	0.27
200	4.0	0.350	0.0020	0.27
400	4.0	0.350	0.0030	0.27
100	12.0	0.350	0.0018	0.27
400	12.0	0.350	0.0045	0.27

Characteristic points and stress–dilatancy parameters for scaled railway ballast_

σ_c	w	ε_a [%]			Parameters α and β
[kPa]		Y₁	Y₂	F	α₁	β₁	α₂	β₂	α₃	β₃
15	Dry	0.10	0.30	4.00	–0.70	–3.5	0.28	1.60	–0.10	1.30
25		0.15	0.50	5.50	–0.30	–3.5	0.22	1.50	0.00	1.20
60		0.10	0.60	5.50	–0.15	3.5	0.00	1.50	–0.35	1.00
115		0.10	0.90	8.00	–0.65	4.2	0.05	1.60	–0.63	0.30
200		0.10	1.1	10.00	–0.10	1.9	0.00	1.80	–0.00	1.80
15	Saturated	0.15	0.40	10.50	0.25	–3.5	0.20	1.50	–0.05	1.30
200		0.12	1.15	10.00	0.05	2.2	–0.15	2.05	0.00	1.50

DOI: https://doi.org/10.2478/sgem-2018-0018 | Journal eISSN: 2083-831X | Journal ISSN: 0137-6365

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Language: English

Page range: 79 - 85

Submitted on: Mar 23, 2018

Accepted on: Jun 26, 2018

Published on: Oct 3, 2018

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

railway ballast,

critical state,

frictional state,

Related subjects:

Geosciences, other,

Materials sciences,

Porous materials,

Mechanics and fluid dynamics

© 2018 Katarzyna Dołżyk-Szypcio, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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