| 盾构超近距离侧穿铁路桥桩保护方案探讨 |
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| 引用本文： | 任磊,朱颖,崔天麟.盾构超近距离侧穿铁路桥桩保护方案探讨[J].地球科学,2021,46(6):2278-2286. |
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| 作者姓名： | 任磊 朱颖 崔天麟 |
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| 作者单位： | 郑州地铁集团有限公司,河南郑州 450000;河南工业大学土木建筑学院,河南郑州 450001;郑州地铁集团有限公司,河南郑州 450000 |
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| 基金项目： | 河南省交通运输厅项目2020J5 |
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| 摘 要： | 郑州地铁某盾构区间超近距离侧穿铁路桥梁桩基，受地面空间及隧道与桥桩间净距限制，无法采用隔离桩等常规保护措施.结合工程实际情况提出“盾构通过范围内土体注浆加固”、“桥梁承台加固”以及“注浆+承台加固”三种措施，利用数值模拟手段，对盾构侧穿施工期间，不同保护方案下桥桩的变形规律进行了分析研究.研究结果表明，采用“盾构通过范围内土体注浆加固+承台加固”措施，可使桥面最大沉降值减少约45%，且可减少桥面横桥向不均匀沉降及桥桩水平位移，在很大程度上减少盾构隧道施工对铁路桥梁的不利影响.
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| 关 键 词： | 注浆加固 地铁 数值计算 铁路桥桩 工程地质 |
| 收稿时间： | 2021-01-02 |
Study on Protection Scheme of Shield Tunnel Passing through Railway Bridge Pile at a Short Distance |
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| Ren Lei,Zhu Ying,Cui Tianlin.Study on Protection Scheme of Shield Tunnel Passing through Railway Bridge Pile at a Short Distance[J].Earth Science-Journal of China University of Geosciences,2021,46(6):2278-2286. |
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| Authors: | Ren Lei Zhu Ying Cui Tianlin |
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| Abstract: | A shield tunnel of Zhengzhou Metro passes through the existing pile foundations of railway bridge at ultra close distance.Due to the limitation of ground space and clear distance between tunnel and bridge pile, conventional protection measures such as isolation pile cannot be adopted.In this paper, three protection measures are put forward, which are "soil grouting reinforcement within the scope of shield passing", "bridge cap reinforcement" and "grouting + bridge cap reinforcement". By means of numerical simulation, the deformation law of bridge piles under different protection measures was analyzed.The results show that the maximum settlement of the bridge deck can be reduced by about 45% by adopting the measures of "grouting + bridge cap reinforcement", besides, the uneven settlement of bridge deck in transverse direction and horizontal displacement of bridge pile can be significantly reduced. |
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