\r庄 妍¹，崔晓艳¹，王康宇\r²\r
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AuthorsHTML:\r庄 妍¹，崔晓艳¹，王康宇\r²\r
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AuthorsListE:\rZhuang Yan¹，Cui Xiaoyan¹，Wang Kangyu\r²\r
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AuthorsHTMLE:\rZhuang Yan¹，Cui Xiaoyan¹，Wang Kangyu\r²\r
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Unit:\r1. 东南大学土木与交通学院混凝土及预应力混凝土结构教育部重点实验室，南京 210096；
2. 浙江工业大学建筑工程学院，杭州 310023\r
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Unit_EngLish:\r1. Key Laboratory for RC and PRC Structures of Ministry of Education，School of Civil Engineering，Southeast University，Nanjing 210096，China；
2. School of Civil Engineering and Architecture，Zhejiang University of Technology，Hangzhou 310023，China\r
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Abstract_Chinese:\r已有研究发现，外界荷载作用下加筋体将产生三维变形，且变形形状近似于椭圆抛物面．根据加筋体的三维变形特点推导了加筋体的三维变形表达式，并据此推导了加筋体的应变、加筋体上作用的竖向应力以及加筋体拉力的求解公式．将加筋体变形三维效应的解析方法应用于桩承式路堤中，分别分析了桩为正方形与梅花形布置情况下土拱破坏发生在拱顶与桩帽时，作用在路堤底部四桩中心处的竖向应力．进而推求了桩承式加筋路堤中同时考虑土拱效应、加筋体作用以及软土承载作用的简化计算方法．该简化计算方法可求解获得桩承式加筋路堤中软土表面最大沉降、软土表面作用的竖向应力，以及路堤中竖向应力沿深度的分布规律．将该简化计算方法应用于桩承式路堤的2 个工程实例中，计算了软土表面中心处的沉降，并分析了桩间距的变化对软土表面最大沉降的影响．通过对比发现：采用简化方法计算出的结果与现场监测结果的误差分别为19.5% 与13.0%，从而验证了该简化计算方法的正确性．从计算结果中同时可以看出：软土表面最大沉降随桩间距的增大基本呈线性增大的趋势，当桩间距增大75%时，软土表面最大沉降增大约86%～95%．\r
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Abstract_English:\rIn recent years，geosynthetics has been widely used in the construction of piled embankments because it provides vertical bearing capacity for the embankment to withstand the external and internal loads．Geosynthetics effectively limit the lateral displacement of the embankment fillings．Existing studies reported that the deformed geosynthetic reinforced structure resembled an elliptic paraboloid．In this study，the three-dimensional deformation formula of geosynthetic reinforced structure was first deduced to determine the geosynthetic strain，the vertical stress acting on the geosynthetic reinforced structure，and the tension generated in the geosynthetic reinforced structure because of various loads acting on it．Then，the vertical stress at the base of the embankment was derived to determine the failure mechanisms of the arch，both at the crown and the pile cap．The vertical stress on the piles were calculated when they were arranged in the square and triangular patterns．Considering the three-dimensional deformation of geosynthetic reinforced structure，a simplified analytical method to analyze the reinforced piles embankment was proposed．The proposed method considered the arching effect and bearing capacities of geosynthetic reinforced structure and subsoil．The proposed method can directly calculate the maximum settlement at the surface of the subsoil in the reinforced piled embankment along with the vertical stress acting on the subsoil surface and the distribution of vertical stress along the embankment height．The proposed method was used to calculate the settlement at the surface of the subsoil of two field cases and to evaluate the effect of pile spacing on the settlement of subsoil．The errors between the calculated results from the simplified analytical method and on-site measurements were 19.5% and 13.0%，respectively， hereby validating the correctness of the proposed method．Thus，the maximum settlement at the surface of the subsoil linearly increases with increasing pile spacing．When the pile spacing was increased by 75%，the maximum settlement increased by 86%—95%．\r
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Keyword_Chinese:加筋体；桩承式加筋路堤；土拱效应；理论分析\r

Keywords_English:geosynthetics；reinforced piled embankment；arching effect；analytical analysis\r


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