| 土工格室加筋土垫层路堤临界高度研究 |
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| 引用本文： | 梁程,徐超.土工格室加筋土垫层路堤临界高度研究[J].岩土力学,2018,39(8):2984-2990. |
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| 作者姓名： | 梁程 徐超 |
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| 作者单位： | 1. 同济大学 土木工程学院 地下建筑与工程系，上海 200092；2. 同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家自然科学基金项目（No.41272293） |
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| 摘 要： | 土工格室能有效减少软土地基上路堤的变形，并增强其稳定性，但对于土工格室加筋土垫层路堤的临界高度还少有研究。采用极限平衡分析方法，假定地基在路堤荷载作用下呈圆弧滑动破坏模式，将格室及其内的填土视为复合体，考虑格室复合体的应力扩散作用和侧向限制作用，提出了路堤临界高度的计算模型，并将该模型值与建立的有限差分模型结果进行对比，然后讨论了格室高度、应力扩散角及格室复合体与地基接触面摩擦系数对路堤临界高度的影响规律。结果表明，理论分析和数值计算结果吻合较好；加筋路堤的临界高度明显大于未加筋路堤的临界高度，并且增加此3种影响因素的取值均能提高路堤的临界高度；同时增强格室的侧向限制作用比提高格室高度和应力扩散角更有利于路堤的稳定。
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| 关 键 词： | 加筋土路堤 土工格室 复合体 稳定性 临界高度 |
| 收稿时间： | 2016-12-10 |
Study on critical height of reinforced embankments with geocell layer |
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| LIANG Cheng,XU Chao.Study on critical height of reinforced embankments with geocell layer[J].Rock and Soil Mechanics,2018,39(8):2984-2990. |
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| Authors: | LIANG Cheng XU Chao |
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| Institution: | 1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China |
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| Abstract: | Geocell geosynthetics can effectively reduce the deformation of embankments on soft subgrade and enhance its stability, but there are few researches on critical height of geocell-supported embankments. In this study, the limit equilibrium method was employed, and circular sliding failure mode presented in the foundation under the embankment load was assumed firstly. Geocell and its filled soil were regarded as composite material considering its vertical stress dispersion effects and lateral confinement effects. An analytical model about critical height of the embankments was then proposed and its results were compared with that of the finite difference model which was calculated using FLAC. Finally, the effects of geocell height, angle of stress dispersion and friction coefficient between geocell layer and foundation on the critical height of embankments were discussed based on the analytical model. It turned out that the results between theoretical analysis and numerical calculation were well coincident with each other. The critical height of geocell-reinforced embankments was obviously greater than the critical height of unreinforced ones. Increasing the three influencing factors can improve its critical height, and strengthening the lateral confinement of geocell layer was more in favor of the stability of embankments than improving the geocell height and angle of stress dispersion. |
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| Keywords: | reinforced embankments geocell composite material stability critical height |
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