Behavior of geogrid-reinforced ballast under various levels of fouling

被引：183

作者：

Indraratna, Buddhima ^{[1
]}

Ngoc Trung Ngo ^{[1
]}

Rujikiatkamjorn, Cholachat ^{[1
]}

机构：

[1] Univ Wollongong, Fac Engn, Ctr Geomech & Railway Engn, Wollongong, NSW 2522, Australia

来源：

GEOTEXTILES AND GEOMEMBRANES | 2011年 / 29卷 / 03期

关键词：

Ballast; Coal fines; Fouling; Geogrids; CONFINING PRESSURE; SHEAR-STRENGTH; RAILWAY;

D O I：

10.1016/j.geotexmem.2011.01.015

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

This paper presents a study of how the interface between ballast and geogrid copes with fouling by coal fines. The stress-displacement behavior of fresh and fouled ballast, and geogrid reinforced ballast was investigated through a series of large-scale direct shear tests where the levels of fouling ranged from 0% to 95% Void Contamination Index (VCI), at relatively low normal stresses varying from 15 kPa to 75 kPa. The results indicated that geogrid increases the shear strength and apparent angle of shearing resistance, while only slightly reducing the vertical displacement of the composite geogrid-ballast system. However, when ballast was fouled by coal fines, the benefits of geogrid reinforcement decreased in proportion to the increasing level of fouling. A conceptual normalized shear strength model was proposed to predict this decrease in peak shear stress and peak angle of shearing resistance caused by coal fines at a given normal stress. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.

引用

页码：313 / 322

页数：10

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