﻿ 交通–电力共建隧道横通道与检修道交叉段围岩稳定性研究

# 交通–电力共建隧道横通道与检修道交叉段围岩稳定性研究Study on Surrounding Rock Stability of Cross Section of Traffic-Electric Co-Construction Tunnel of Cross Section and Overhaul Road

Abstract: Combining with the Jinzhuwan Tunnel and the power tunnel co-construction project of Tongmao Avenue in Chongqing, the intersection of the crosswalk of the tunnel and the overhaul of the power tunnel is taken as the research object, and a three-dimensional finite element model is established, which passes through the cross section of the pedestrian crossing and the power tunnel. The finite element analysis of the construction process analyzes the displacement, stress, plastic zone characteristics of the surrounding rock and the influence of the overhaul and the sidewalk on the surrounding rock of the tunnel, which provides a basis for the tunnel support design.

1. 引言

2. 有限元计算模型

2.1. 模型的建立

Figure 1. Meshing of 3D numerical analysis model

2.2. 参数的选取

Table 1. Rock mass mechanical parameter

2.3. 施工工序

(a) 施工步序10 (b) 施工步序28

Figure 2. Excavation schedule of the tunnel

3. 模拟结果及分析

3.1. 围岩位移特征

Figure 3. Change of tunnel lining contour of the right tunne

Figure 4. Change of tunnel lining contour of the left tunnel

Figure 5. The arrangement of feature points of the right and left tunnels

Figure 6. Curve of the right tunnel settlements along tunnel axis

Figure 7. Curve of the left tunnel settlements along tunnel axis

3.2. 围岩应力特征

Figure 8. Maximum principal stress diagram of arch crow of the right tunnel

Figure 9. Maximum principal stress diagram of arch crow of the leftt tunne

3.3. 围岩最大主应力迹线及塑性区分布

Figure 10. Principle stress line of surrounding rockmass

Figure 11. Plastic zone of surrounding rock mass

4. 结论

NOTES

*通讯作者。

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