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| Experiment on influence of defects at the connection between side wall and inverted arch on tunnel structure |
| ZHOU Xuming1,2, SHI Yufeng1,2*, ZHANG Limin1,2, ZHANG Huipeng3, CAO Chengwei1,2, CHEN Zhaoyang1,2
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| （1. Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, Jiangxi, China;2. Jiangxi Underground Space Technology Development Engineering Research Center, Nanchang 330013, Jiangxi, China;3. Nanchang Rail Transit Group Co., Ltd., Nanchang 330038, Jiangxi, China） |
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Abstract In order to study the influence of different forms of defects on the stress of lining structure, through the model test, different forms of defects were simulated, and the changes of bending moment, axial force and safety factor at different parts of lining structure were analyzed. The results showed that the defects at the connection between the side wall and the inverted arch increased the bending moment and axial force at the middle of the lining arch waist and the inverted arch, and decreased the bending moment and axial force at the vault. According to the different forms of defects, the effects on different parts of the lining were different. When there were only concrete shrinkage defects or unconnected steel defects, the main influence parts of lining structure were haunch and side wall. When the two defects coexisted, the middle part of vault and inverted arch would also be greatly affected. The influence of concrete loose defects on the safety factor of lining structure was generally greater than that of unconnected defects of steel bars. The main influence areas were arch waist and side wall. When the two defects coexisted, the safety factor at the middle of arch waist and invert decreased obviously, which was 52.03% and 32.40% respectively. The effect of defects on the safety factor at the middle of the hance and inverted arch was greater than that at the vault and side wall. During construction, the quality of concrete pouring here should be strictly controlled to ensure the strength after forming, and the pouring thickness can be appropriately increased to make it have a higher safety reserve.
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Received: 10 November 2022
Published: 20 March 2023
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