| 桩网支承路基结构中土拱效应及网垫受力的模型试验研究 |
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| 引用本文： | 蔡德钩,闫宏业,叶阳升,张千里,何华武,杨生哲.桩网支承路基结构中土拱效应及网垫受力的模型试验研究[J].铁道学报,2011(11):85-92. |
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| 作者姓名： | 蔡德钩 闫宏业 叶阳升 张千里 何华武 杨生哲 |
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| 作者单位： | 中国铁道科学研究院铁道建筑研究所;中华人民共和国铁道部;东南大学土木工程学院; |
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| 基金项目： | 铁道部科技研究开发计划项目(2006G013) |
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| 摘 要： | 基于相似理论,对桩网支承路基中心土拱效应进行8组模拟试验。测试桩顶轴力、桩土及路基不同高度处应力、格栅拉力和桩间土沉降随路基高度、外荷载变化特性,探讨格栅受力后变形。结果表明:加筋网垫上方竖向应力与以球形拱理论为基础的德国规范计算结果较为接近;加筋网垫下方桩间土承担竖向应力随路基高度、上覆荷载增加而增加;黏性土路基成拱效率略低于砂土路基;对于两层格栅组成的加筋网垫,下层格栅承担土拱效应竖向应力引起拉力大于上层格栅,位于桩帽之间并垂直于桩帽边格栅拉力大于平行于桩帽边格栅拉力;格栅初始松紧状态对土拱成拱效率有一定影响;格栅受力后平面变形形状近似呈悬索状。研究成果可为我国桩网支承路基结构加筋网垫相关规范提供参考。
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| 关 键 词： | 桩网支承路基 土拱效应 模型试验 路基应力 格栅拉力 |
Model Study on Arch Effect and Bedding Force of Geosynthetics Reinforced and Pile Supported Embankment |
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| CAI De-gou,YAN Hong-ye,YE Yang-sheng,ZHANG Qian-li,HE Hua-wu,YANG Sheng-zhe.Model Study on Arch Effect and Bedding Force of Geosynthetics Reinforced and Pile Supported Embankment[J].Journal of the China railway Society,2011(11):85-92. |
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| Authors: | CAI De-gou YAN Hong-ye YE Yang-sheng ZHANG Qian-li HE Hua-wu YANG Sheng-zhe |
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| Affiliation: | CAI De-gou1,YAN Hong-ye1,YE Yang-sheng1,ZHANG Qian-li1,HE Hua-wu2,YANG Sheng-zhe3(1.Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing 100081,China,2.Railway Ministry of China,Beijing 100844,3.College of Civil Engineering,Southeast University,Nanjing 210000,China) |
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| Abstract: | On the basis of the theory of similarity,eight model experiments have been made to test the arch effect of the geosynthetics reinforced and pile supported embankment(GRPS).The axial force of pile cap,stresses at different heights of the subgrade,tensile force of geosynthetics and inter-pile soil settlement and its variations with different heights of the subgrade and under different external loads have been measured in the course of filling and after filling.Deformations of geosynthetics have been studied.T... |
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| Keywords: | geosynthetics reinforced and pile supported embankment arch effect model test stress of subgrade tensile force of geosynthetics |
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