| 循环荷载下桩网结构路基和垫层动力响应研究 |
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| 引用本文： | 张崇磊,蒋关鲁,袁胜洋,王伟.循环荷载下桩网结构路基和垫层动力响应研究[J].岩土力学,2014,35(6):1664-1670. |
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| 作者姓名： | 张崇磊 蒋关鲁 袁胜洋 王伟 |
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| 作者单位： | 1.西南交通大学 土木工程学院，成都 610031；2.西南交通大学 道路工程四川省重点实验室，成都 610031 |
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| 基金项目： | 铁道部科技研究开发计划项目（No. 2010G003-F）；国家博士点基金资助项目（No. 20070613044）。 |
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| 摘 要： | 基于相似理论，开展了4组桩网结构路基大比例动态模型试验，测试了循环荷载下桩网结构路基的动力响应指标，研究了降雨前、后加载力、加载频率以及循环加载次数对路基的动力响应、桩土荷载分担以及垫层格栅应变的影响。结果表明，降雨后路基动应力和动加速度均会增大，并且在基床内部增速较快，而路堤下部其增长基本趋于稳定；循环加载期间桩土应力比缓慢增大，其受降雨影响敏感，雨后降幅可达56.4%～79.5%；循环加载完成后垫层格栅应变增大，其横向分布特征基本保持不变；土拱形成后路基填高继续增加，路基宽度范围内4桩中心格栅应变增幅较大，峰值出现在边坡中心和路基中心附近，横向分布呈“W”型；两桩中心的格栅应变由路基中心向坡脚处呈“台阶”型递增，而路基宽度与边坡范围的格栅应变差距不断缩小。
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| 关 键 词： | 桩网结构路基 动力响应 格栅应变 循环荷载 大比例模型试验 |
| 收稿时间： | 2013-03-19 |
Dynamic response analysis of column-net structure subgrade and reinforced cushion under cyclic loading |
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| ZHANG Chong-lei,JIANG Guan-lu,YUAN Sheng-yang,WANG Wei.Dynamic response analysis of column-net structure subgrade and reinforced cushion under cyclic loading[J].Rock and Soil Mechanics,2014,35(6):1664-1670. |
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| Authors: | ZHANG Chong-lei JIANG Guan-lu YUAN Sheng-yang WANG Wei |
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| Institution: | 1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. Key Laboratory of Highway Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China |
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| Abstract: | Four large-scale model tests are made to monitor the dynamic response of column-net structure subgrade. The influence of loading level, loading frequency and loading times on the dynamic parameters, the pile-soil load sharing and the strains of geogrid are studied. The results show that the dynamic stress and the dynamic acceleration increase fast in the bed of subgrade and underneath trend towards stability with depth after rainfall. During the stage of cyclic loading, the stress concentration ratio increases slowly. After rainfall, the stress concentration ratio can decrease about 56.4 % to 79.5 %. Compared with the construction stage, the strains of geogrid increase and the transverse distributions remain the same form after cyclic loading. The strains of geogrid among four piles within the width of subgrade increase fast after the formation of soil arching. The peak value points of strains of geogrid appear in the centre of the slope and subgrade, which emerges as W-shape in the cross-section. The strains of geogrid between two piles increase from the centre to the slope toe of subgrade, which emerges as stair-shape. The differences of strains of geogrid between the slope and the width of subgrade decrease gradually after the formation of soil arching. |
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| Keywords: | column-net structure subgrade dynamic response geogrid strain cyclic loading large-scale model test |
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