| 软土地基坑中坑支护体系温度效应的数值分析 |
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| 引用本文： | 陈林靖.软土地基坑中坑支护体系温度效应的数值分析[J].地质与勘探,2023,59(3):637-646. |
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| 作者姓名： | 陈林靖 |
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| 作者单位： | 福州大学，土木工程学院，福建福州 |
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| 基金项目： | 中铁十一局集团第四工程有限公司横向项目(编号：00502132)资助 |
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| 摘 要： | 环境温度变化导致基坑支护结构内支撑轴力和变形过大的问题不容忽视。本文以福州地铁6号线潘墩站坑中坑工程为例，选取该基坑代表性区段采用ABAQUS程序及邓肯-张模型对其开挖和支护全过程进行三维有限元模拟，并将分析结果与现场部分监测数据进行对比，验证了所建模型及其材料参数取值的可靠性。同时，利用所建模型着重分析当地可能的季节或昼夜温差变化幅度内支撑轴力及围护墙水平位移的变化规律。结果表明：基坑开挖完成后，温度变化时支撑轴力与温度呈线性相关关系，轴力变化主要体现在内外坑的首道支撑上，此时围护结构整体向坑内或坑外运动，且地连墙侧移受温度影响范围主要集中在基坑开挖深度以上。不同开挖阶段的温度变化引起的温度效应相差较大，潘墩站最不利工况发生在最后一道支撑架设完毕后，此时地连墙水平位移增量及轴力变化幅度最大，温度效应最明显。该研究成果对类似软土基坑工程具有重要的理论和实践意义。
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| 关 键 词： | 坑中坑 温度效应 现场监测 数值分析 潘墩站 地铁6号线 福州 |
| 收稿时间： | 2021/6/29 0:00:00 |
| 修稿时间： | 2022/5/12 0:00:00 |
Numerical analysis of temperature effect on retaining system for pit-in-pit excavation engineering in soft soil ground |
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| Chen Linjing.Numerical analysis of temperature effect on retaining system for pit-in-pit excavation engineering in soft soil ground[J].Geology and Prospecting,2023,59(3):637-646. |
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| Authors: | Chen Linjing |
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| Institution: | School of Civil Engineering, Fuzhou University, Fuzhou,Fujian |
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| Abstract: | The variations of ambient temperature will lead to the increment of axial force and deformation for supporting structures in a foundation pit, which should not be ignored. Taking the pit-in-pit project at Pandun Station of Fuzhou Metro Line 6 as an example, this work simulated the whole process of excavation and construction by the software ABAQUS and Duncan-Chang constitutive model with 3D?finite?element?method. On this basis, the analysis results were compared with the on-site monitor data to verify the reliability of the model and the material parameter values. In addition, the variation regularity of horizontal displacement and support axial force of the retaining structure was analyzed with the influence of seasonal or day and night temperature changes. The support axial force was linearly related to the temperature after the completion of the foundation pit excavation. The change of the axial force was mainly reflected in the first support of the inner or outer pit and the whole retaining structure moved inside or outside of the pit. The horizontal displacement range of the diaphragm wall affected by the temperatures was mainly concentrated above the excavation depth. The temperature effects caused by temperature changes in different excavation stages were quite different. The most unfavorable condition at Pandun Station occurred after the finish of the last support, the horizontal displacement increment and the change of the axial force were the largest, and the temperature effect was the most obvious. This research will provide important theoretical and practical significance for similar projects. |
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| Keywords: | pit-in-pit temperature effect Duncan-Chang model on-site monitor numerical analysis Pandun station subway line 6 Fuzhou |
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