| 湿陷性黄土铁路路基原位浸水试验研究 |
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| 引用本文： | 姚建平,蔡德钩,闫宏业,史存林.湿陷性黄土铁路路基原位浸水试验研究[J].中国铁道科学,2011,32(2). |
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| 作者姓名： | 姚建平 蔡德钩 闫宏业 史存林 |
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| 作者单位： | 中国铁道科学研究院,铁道建筑研究所,北京,100081 |
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| 基金项目： | 铁道部科技研究开发计划项目 |
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| 摘 要： | 在湿陷性黄土铁路路基试验段,运用大型原位浸水试验,研究路基浸水后柱锤冲扩桩和挤密桩地基的浸水规律以及地基土湿陷对路基沉降的影响.研究结果表明:柱锤冲扩桩和挤密桩地基分别在浸水60和50d时,浸水附加沉降发生突变;浸水约19 d浸润角达到最大,因此路基坡脚附近因降雨或其他原因形成的积水滞留时间不应超过19 d;浸水87 d柱锤冲扩桩路堤的沉降量为1.7～5.1 mm,挤密桩为26.2～51.3 mm;长时间持续浸水后柱锤冲扩桩路堤的总沉降量仅为3.8～7.4 mm,而挤密桩路堤的总沉降量则高达62.3～103.1mm,因此在实际工程中,一定要加强挤密桩路段的防排水措施,避免局部积水,以保证行车安全;未处理湿陷性黄土地基的浸润角为38°～42°,故建议在湿陷性黄土地区修建铁路时,距路基坡脚一定范围内不能有鱼塘、水池等长期积水设施.
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| 关 键 词： | 路基 湿陷性黄土 原位浸水试验 柱锤冲扩桩 挤密桩 浸润角 |
In-situ Immersion Experimental Study on Railway Subgrade with Collapsible Loess |
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| YAO Jianping,CAI Degou,YAN Hongye,SHI Cunlin.In-situ Immersion Experimental Study on Railway Subgrade with Collapsible Loess[J].China Railway Science,2011,32(2). |
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| Authors: | YAO Jianping CAI Degou YAN Hongye SHI Cunlin |
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| Affiliation: | YAO Jianping,CAI Degou,YAN Hongye,SHI Cunlin(Railway Engineering Research Institute,China Academy of Railway Sciences,Beijing100081,China) |
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| Abstract: | In railway subgrade testing section with collapsible loess,the large in-situ immersion experimentation is used to study the immersion behavior of piles thrusted-expanded in column-hammer and compaction pile and the influence on subgrade settlement with collapsible foundation soil.The results indicate that the additional immersion settlement abrupt changes after 60 and 50 days immersion for piles thrusted-expanded in column-hammer and compaction pile foundation respectively,and the immersion angle is to achi... |
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| Keywords: | Subgrade Collapsible loess In-situ immersion test Pile thrustedexpanded in column-hammer Compaction pile Immersion angle |
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