| 考虑成层土路堤荷载下复合地基加固区沉降计算 |
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| 引用本文： | 陈昌富,曾德淼,吴燕泉,孙彦.考虑成层土路堤荷载下复合地基加固区沉降计算[J].水文地质工程地质,2013,40(1):58-63. |
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| 作者姓名： | 陈昌富 曾德淼 吴燕泉 孙彦 |
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| 作者单位： | 湖南大学岩土工程研究所，湖南 长沙 410082 |
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| 基金项目： | 国家自然科学基金项目资助(51278186);高校博士点专项基金资助项目(20110161110018) |
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| 摘 要： | 考虑土的成层性，假定桩周成层土弹性模量的不同不影响桩中性点位置，应用弹性理论和桩土位移协调条件及边界条件，推导了路堤荷载下复合地基加固区桩及桩周土压缩量计算的解析式，同时得到了各层土范围内桩、桩周土竖向应力及桩侧剪应力的表达式，并利用有限元分析了桩周土弹性模量的变化对桩中性点位置的影响规律，验证了假定。结果表明:使用该计算方法分析路堤荷载下复合地基加固区内桩和桩周土的变形，计算结果与有限元及实测结果比较接近，满足工程计算精度要求，能为类似地基土成层分布工程沉降分析提供有益参考。
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| 关 键 词： | 成层土 路堤荷载 复合地基 弹性理论 中性点 沉降 |
Settlement of reinforced region for composite foundation under loads of embankment in stratified soil |
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| CHEN Chang-fu,ZENG De-miao,WU Yan-quan,SUN Yan.Settlement of reinforced region for composite foundation under loads of embankment in stratified soil[J].Hydrogeology and Engineering Geology,2013,40(1):58-63. |
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| Authors: | CHEN Chang-fu ZENG De-miao WU Yan-quan SUN Yan |
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| Affiliation: | Institute of Geotechnical Engineering, Hunan University, Changsha, Hunan 410082, China |
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| Abstract: | Provided that the neutral point of a pile is insensitive to the variance of elastic modulus for stratified soil, which is verified by finite element stimulation in the following section, analytical formulas of compressive quantity for pile and surrounding soil in reinforced region of composite foundation under embankment loads were derived along with the expressions for vertical stress of pile and surrounding soil, and shear stress of pile surrounding in each soil layer, by applying elasticity, compatibility of pile-soil displacement and boundary conditions. Comparison between results of the calculation approach and those of finite element and in situ measurements indicates that a good agreement for the deformation of pile and surrounding soil within the precision tolerance of engineering computation is obtained. This work will benefit the settlement analysis for cases in similar stratified soil. |
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