| 道床断面尺寸对道床横向阻力的影响 |
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| 引用本文： | 高亮,罗奇,徐旸,蒋函珂,曲村.道床断面尺寸对道床横向阻力的影响[J].西南交通大学学报,2014,27(6):954-960. |
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| 作者姓名： | 高亮 罗奇 徐旸 蒋函珂 曲村 |
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| 基金项目： | 国家自然科学基金资助项目(U1234211) |
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| 摘 要： | 为揭示道床横向阻力变化特征,采用离散元法,建立了高速铁路有砟道床-轨枕三维模型,研究了道床边坡坡度、顶面宽度、道床厚度和砟肩堆高等道床断面尺寸对其横向阻力的影响,分析了枕底、枕侧和砟肩阻力及其分担的横向阻力比例.结果表明:坡度为 1:1.50~1:1.85时,横向阻力为10.315~16.475 kN,坡度为 1:1.65及更缓能满足横向阻力超过12 kN/枕的要求.顶面宽度为3.0~3.8 m时,横向阻力为10.205~15.715 kN,顶面宽度为3.4 m及以上能满足横向阻力超过12 kN/枕的要求.随边坡变缓或顶面宽度增大,砟肩道砟增多,砟肩阻力显著增大.道床厚度为200~400 mm时,横向阻力为9.156~15.684 kN;横向推动轨枕时,道床从上向下分层拖动;随道床厚度增大,枕底阻力明显增大,道床厚度为300 mm及以上能满足横向阻力超过12 kN/枕的要求.砟肩堆高为0~180 mm时,砟肩阻力为2.010~5.203 kN,横向阻力为9.526~15.257 kN,砟肩堆高对砟肩阻力影响很大,堆高120 mm及以上能满足横向阻力超过12 kN/枕的要求.
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| 关 键 词： | 铁路道床 横向阻力 断面尺寸 离散元法 |
| 收稿时间： | 2013-10-29 |
Effects of Ballast Bed Section Dimension on Its Lateral Resistance |
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| GAO Liang,LUO Qi,XU Yang,JIANG Hanke,QU Cun.Effects of Ballast Bed Section Dimension on Its Lateral Resistance[J].Journal of Southwest Jiaotong University,2014,27(6):954-960. |
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| Authors: | GAO Liang LUO Qi XU Yang JIANG Hanke QU Cun |
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| Abstract: | In order to reveal the variation characteristics of ballast bed lateral resistance, a three-dimensional model for ballast bed and sleeper was established based on the discrete element method. The effects of important factors of ballast bed section dimension, such as ballast bed slope grade, thickness, top width and shoulder height, were investigated, and proportions of lateral resistance shared by sleeper base, crib and shoulder were analyzed. The research results indicate that when slope grade changes from the ratio of 1 to 1.50 to the ratio of 1 to 1.85, lateral resistance varies from 10.315 to 16.475 kN, and if slope grade equals the ratio of 1 to 1.65 or smaller, lateral resistance can satisfy 12 kN per sleeper. When top width increases from 3.0 to 3.8 m, lateral resistance varies from 10.205 to 15.715 kN, and if top width is 3.4 m or wider, lateral resistance can satisfy 12 kN per sleeper. Lateral resistance increases with the decline of slope grade and the increasement of top width, shoulder resistance increases significantly as a result of the increasement of shoulder ballast. When ballast bed thickness increases from 200 to 400 mm, lateral resistance varies from 9.156 to 15.684 kN; ballast bed drags based on different layers when the sleeper moves laterally; and base resistance increases along with the increasement of ballast bed thickness, and if ballast bed thickness is 300 mm or larger, lateral resistance can satisfy 12 kN per sleeper. When shoulder height increases from 0 to 180 mm, shoulder resistance varies from 2.010 to 5.203 kN and lateral resistance varies from 9.526 to 15.257 kN. Shoulder height affects lateral resistance significantly, and if shoulder height is 120 mm or higher, lateral resistance can satisfy 12 kN per sleeper. |
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