邻近基坑开挖对盾构隧道结构影响的精细化数值分析
PDF下载 (235)吴 冰,陈科技,翁天赐,熊勇林.邻近基坑开挖对盾构隧道结构影响的精细化数值分析[J].宁波大学学报(理工版),2024,37(6):10-19.DOI:10.20098/j.cnki.1001-5132.2024.0103
WU Bing,CHEN Keji,WENG Tianci,XIONG Yonglin.Refined numerical model analysis of the influence of adjacent foundation pit excavation on shield tunnel structure[J].Journal of Ningbo University(Natural Science & Engineering Edition),2024,37(6):10-19.DOI:10.20098/j.cnki.1001-5132.2024.0103
| Title: | Refined numerical model analysis of the influence of adjacent foundation pit excavation on shield tunnel structure |
| 作者: | 吴 冰, 陈科技, 翁天赐, 熊勇林 |
| Author(s): | WU Bing, CHEN Keji, WENG Tianci, XIONG Yonglin |
| 关键词: | 基坑开挖; 盾构隧道; 精细化建模; 数值模拟 |
| Keywords: | excavation of foundation pit; shield tunnel; refined modeling; numerical simulation |
| 分类号: | TU391 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.0103 |
| 文献标识码: | A |
| 摘要: | 在邻近隧道进行基坑工程时, 开挖作业所引起的卸荷效应将破坏隧道与土体之间原有的受力平衡, 从而在隧道结构中产生附加应力, 严重时可能导致管片破损、接缝张开和错台以及渗漏水等情况的发生. 利用ABAQUS有限元分析软件, 在充分考虑盾构隧道管片的非连续特征及其与螺栓和土层之间相互作用的基础上, 构建了一个三维精细化模型来分析邻近开挖下盾构隧道结构力学行为规律. 研究重点在于分析不同隧道埋深和隧道与基坑之间的距离对既有盾构隧道结构的响应. 结果表明: 首先, 通过与实验数据及现场监测数据的对比分析, 证实了所建立的盾构隧道模型的准确性和适用性; 其次, 基坑开挖引起的卸荷作用会导致盾构隧道在纵向上产生非均匀且非连续的水平位移, 特别是在基坑开挖影响范围内, 隧道的水平位移更为显著, 而在基坑边缘处则可能出现较大的错台现象. 此外, 研究基于大量的工况模拟结果, 利用参数拟合技术, 建立了盾构隧道横向与纵向变形间的关联模型. 最后, 依据盾构隧道的设计规范和控制标准, 确定了隧道的最大水平位移应控制在17.39mm以内, 而横向的最大收敛率应不超过0.237%, 以确保隧道结构的稳定性和安全性. |
| Abstract: | During the excavation of the foundation pit near the shield tunnel, the unloading effect caused by excavation operations will disrupt the original stress balance between the tunnel and the soil, thereby generating additional stress in the tunnel structure. This may cause damage to tunnel segments, opening of joints, misalignment, and water leakage. In this study, the ABAQUS finite element analysis software is used to construct a three-dimensional refined model to analyze the mechanical behavior of shield tunnel structures under the influence of nearby excavations, where the discontinuous characteristics of shield tunnel segments and their interaction with bolts and soil layers are taken into full account. The focus of the research is on analyzing the response of existing shield tunnel structures to different tunnel burial depths and distances between the tunnel and the foundation pit. The research findings indicate that: Firstly, through comparative analysis with experimental and on-site monitoring data, the accuracy and applicability of the established shield tunnel model are confirmed. secondly, the unloading effect caused by foundation pit excavation results in non-uniform and discontinuous horizontal displacements of the shield tunnel longitudinally, especially within the influence range of the excavation, where the horizontal displacement of the tunnel is more significant, and considerable misalignment may occur at the edges of the pit. Thirdly, a correlation model between the lateral and longitudinal deformations of shield tunnels is established, for which numerous working condition simulations and parameter fitting techniques were employed. Finally, based on the design specifications and control standards of shield tunnels, it is determined that the maximum horizontal displacement of the tunnel should be controlled within 17.39mm, while the maximum convergence rate laterally should not exceed 0.237%, to ensure the stability and safety of the tunnel structure. |
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| 备注/Memo: | 收稿日期: 2024−01−02. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国网浙江省电力有限公司科技项目（5211JY220008）. 第一作者: 吴冰, 高级工程师, 主要研究方向: 电力基建、电网工程数字化. E-mail: wu_bing@zj.sgcc.com.cn *通信作者: 熊勇林, 博士/副教授, 主要研究方向: 岩土材料本构模型及数值分析. E-mail: xiongyonglin@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
