| 铁路岩溶地区多变量作用下的桩基承载特性分析 |
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| 引用本文： | 王新泽.铁路岩溶地区多变量作用下的桩基承载特性分析[J].路基工程,2023,0(2):221-225. |
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| 作者姓名： | 王新泽 |
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| 作者单位： | 中铁十八局集团第二工程有限公司，河北唐山 063000 |
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| 基金项目： | 中铁十八局集团有限公司2020年度科技发展计划课题项目（G20-53） |
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| 摘 要： | 依托汉巴南铁路某桥梁桩基础工程，采用FLAC3D软件建立岩土-溶洞-桩基础三位一体的计算模型，分析岩溶地区桩基础在溶洞跨度、顶板厚度及溶洞形态多变量共同作用下的承载特性。结果表明：厚跨比不变时，顶板厚度的变化对桩基承载力的影响更为显著；长方体和圆柱体溶洞形态条件下的岩溶桩基安全厚跨比临界值选为1，而椭球体形态条件下的岩溶桩基安全厚跨比临界值选为2/3。通过顶板厚度对桩端承力影响曲线、顶板厚度对桩侧摩阻力影响曲线进行拟合，得到修正后的影响因子，进而对桩基经验公式进行修正，由修正后的经验公式所计算出的桩基极限承载力更贴合岩溶地区的实际情况。
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| 关 键 词： | 岩溶地区 多变量 桩基承载特性 数值分析 承载力修正 |
| 收稿时间： | 2022-12-07 |
Analysis of the Bearing Characteristics of Pile Foundations under the Action of Multivariate in the Karst Region along the Railway |
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| Abstract: | In relation to the pile foundation of a bridge on the Hanzhong—Bazhong—Nanchong High-speed railway, the software FLAC3D is used to establish the calculation model of rock-soil, karst cave and pile foundation to analyze the bearing characteristics of pile foundations in the karst region under the combined action of multivariate such as the span of karst cave, the thickness of roof and the shape of karst cave. The result shows that the change of roof thickness has more significant influence on the bearing capacity of pile foundation when the proportion of thickness to span remains unchanged. The critical value of safe proportion of thickness to span of foundations in cuboid and cylinder karst caves is selected as 1, and the critical value of safe proportion of thickness to span of foundations in ellipsoidal karst caves is selected as 2/3. By fitting the influence curve of roof thickness on the bearing capacity of the pile end, and the influence curve of roof thickness on the pile skin friction, the influence factor after correction is obtained. The empirical formula of pile foundation is further corrected. The ultimate bearing capacity of the pile foundation calculated using the corrected empirical formula is more consistent with the actual situation in karst regions. |
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