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- Title
水工隧洞衬砌底板缺陷诱因及其对 结构安全的影响分析.
- Authors
马芳平; 陈英; 黄会宝; 高志良; 彭涛; 谢辉
- Abstract
The hydraulic tunnel will have cracks, wear, falling blocks, scour holes and other defects during long years of operation, which will greatly affect the safety of the project. In view of the causes of scour holes in the lining bottom plate of hydraulic tunnel and their impact on the structural safety, numerical simulation of hydraulic characteristic parameters of tunnel section was carried out, the causes of scour holes in the lining bottom plate were analyzed from the hydraulic point of view, and the impact of different scour hole depths on the stress of the lining structure under operation and maintenance conditions was analyzed. Combined with monitoring data and simulation results, the bearing capacity of the section at the location of the scour hole was checked. The results show that the velocity and turbulent kinetic energy of the tunnel floor are both large, and the tunnel floor is most vulnerable to high-speed water erosion and damage during operation. After the scour hole is formed, it mainly affects the symmetry and numerical value of the bending moment of the tunnel bottom plate and side wall, and has little influence on the axial force and shear force. Due to the difference of internal and external water pressure control, compared with the maintenance condition, the impact of scour holes on the structural safety under the operating condition is more obvious. The scour holes lead to a significant reduction in the flexural rigidity of the section. With the increase of scour hole depth, the flexural bearing capacity gradually decreases. During the project operation, attention should be paid to the scour of the bottom plate concrete under the operating condition.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 33, p14349
- ISSN
1671-1815
- Publication type
Article