| 广清高速桥梁桩基岩溶顶板安全厚度研究 |
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| 引用本文： | 李俊杰.广清高速桥梁桩基岩溶顶板安全厚度研究[J].路基工程,2018,0(3):171-175. |
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| 作者姓名： | 李俊杰 |
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| 作者单位： | 广东省工程勘察院, 广州 510510 |
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| 摘 要： | 以广清高速公路改扩建工程岩溶区桥梁桩基工程为研究对象，重点考虑基桩数量、桩径、溶洞尺寸等参数，构建桥基岩溶工程地质概化模型，为定量研究提供地质依据；基于力学分析与数值模拟，分别确定各模型桩基岩溶顶板最小安全厚度值，并将其与工程实际进行对比分析。结果表明:力学分析方法，在实际工程中仅可作辅助参考；数值分析方法，具有一定的工程实践意义；桩基岩溶顶板最小安全厚度一般为桩径的2.5~3.0倍。
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| 关 键 词： | 桥梁桩基 岩溶顶板 持力层 安全厚度 数值模拟 |
| 收稿时间： | 2019-11-10 |
Study on Safety Thickness of Karst Roof in Bridge Pile Foundation of Guangqing Highway |
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| Abstract: | Based on the research object of the bridge pile foundation in karst area of Guangqing Highway Expansion Project, the karst engineering geology generalized models of bridge foundation are built to provide the geological basis for the quantitative studies focusing on the number of piles, pile diameter, karst cavity size and so on. Based on the mechanical analysis and numerical simulation, the values of minimum safety thickness of karst roof in each generalized models are determined respectively which are analyzed and compared with the engineering practice. The results show that the mechanical method just can be the assistant reference to the project, while the performance of numerical method is useful to the practical construction. Moreover, the minimum safety thickness of karst roof is generally equal to 2.5 to 3.0 times of the pile diameter. |
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