#### 期刊菜单

Finite Element Simulation of Double Horseshoe Tunnel Excavation
DOI: 10.12677/HJCE.2022.117093, PDF, HTML, XML, 下载: 318  浏览: 439

Abstract: Tunnel excavation will inevitably affect the ground surface settlement, thus affecting the safety of surrounding buildings. The two-dimensional model of double horseshoe tunnel excavation is established by using the finite element software COMSOL, and its plastic strain area and surface settlement are simulated by finite element method. After analysis, the stress distribution diagram, equivalent plastic strain diagram and surface settlement curve before and after soil excavation and at different tunnel distances are given. Through finite element simulation, we can intuitively see the state of soil before and after excavation, which provides a reference for real tunnel excavation.

1. 引言

2. 有限元模拟

2.1. 模型建立

Figure 1. Establishment of double horseshoe tunnel excavation model

2.2. 网格划分

COMSOL软件提供了便捷的网格划分工具，本文通过软件自动生成网格单元。采用自动生成网格，计算结果准确、精度高。由于计算机储存功能较大和计算量要求较高，在利用COMSOL软件操作时采用比较多的三角网格和一些节点数的个数 [7]。如图2所示，靠近隧道半圆形边界的网格很密集，尤其是在隧道的上部，而在其余区域网格较稀疏。

Figure 2. Mesh generation of double horseshoe tunnel

2.3. 稳态计算

3. 计算结果及分析

Figure 3. Stress distribution diagram of soil before excavation

Figure 4. Stress distribution diagram of soil after excavation

Figure 5. Stress distribution diagram when tunnel spacing is too small

Figure 6. Equivalent plastic strain diagram after excavation at normal spacing

Figure 7. Equivalent plastic strain diagram after excavation when the spacing is too small

Figure 8. Surface settlement curve after excavation at normal spacing

Figure 9. Surface settlement curve after excavation when the spacing is too small

4. 结论

NOTES

*通讯作者。

 [1] 秦煜杰, 黎应书, 李微. 软弱围岩隧道开挖方法比选及数值模拟研究[J/OL]. 水力发电: 1-6. http://kns.cnki.net/kcms/detail/11.1845.TV.20220304.1037.002.html, 2022-05-03. [2] 杨理想, 贺晓东. 基于有限元软件对隧洞开挖进行模拟分析[J]. 科学技术创新, 2020(4): 59-60. [3] 樊嘉琦, 沈松霖, 吕媛媛. 小净距双隧道开挖有限元仿真研究[J]. 科学技术创新, 2020(32): 143-144. [4] 华薇. 隧道开挖施工过程的有限元动态模拟研究[J]. 四川建筑, 2014, 34(6): 91-93+96. [5] 齐得旭, 傅荣华. 某隧道进口段开挖的力学响应分析[J]. 成都大学学报(自然科学版), 2015, 34(1): 91-93. [6] 漆泰岳. 地铁施工引起地层和建筑物沉降特征研究[J]. 岩土工程学报, 2012, 34(7): 1283-1290. [7] 焦丽芳, 王瑞骏, 焦富涛, 等. 复杂围岩有压隧洞应力变形有限元仿真分析[J]. 水资源与水工程学报, 2007(5): 86-89. [8] 王良, 刘元雪. 软弱围岩隧道开挖的有限元模拟[J]. 重庆工学院学报, 2005(8): 104-106+112. [9] 陶星. 隧道开挖释放荷载的有限元模拟方法研究[J]. 四川建筑, 2012, 32(6): 67-68. [10] 刘鹏飞. 小磨公路小净距隧道设计与施工技术研究[D]: [硕士学位论文]. 昆明: 昆明理工大学, 2018.