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| Optimal design of asymmetrical reinforcement for diaphragm wall in a deep foundation pit |
| CAO Chengwei1, SHI Yufeng1*, XU Changjie1, HOU Shilei2, GONG Honghua3, JI Songyan4
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1. Jiangxi Key Laboratory of Geotechnical Infrastructure Safety and Control, East China Jiaotong University, Nanchang 330013, Jiangxi, China;
2. China Railway 14th Bureau Group Co., Ltd., Jinan 250101, Shandong, China;
3. Jiangxi Local Railway Development Co., Ltd., Nanchang 330001, Jiangxi, China;
4. China Railway Construction Bridge Engineering Bureau Group 1st Engineering Co., Ltd., Dalian 116033, Liaoning, China
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Abstract Relying on the open excavation subway foundation pit project of Aixihu in Nanchang, the excavation of the foundation pit was numerically simulated by ABAQUS software. The reliability and applicability of the numerical model were verified by comparing the numerical calculation and field monitoring results of the horizontal displacement of the diaphragm wall, supported axial force, surface settlement. The bending moment variation law of diaphragm wall during excavation was analyzed. The research showed that there was a significant difference in the bending moment between the earth facing side and the excavation side of the diaphragm wall, the excavation side was tensioned as a whole and the earth facing side was compressed as a whole. The maximum bending moment of the excavation side was 2.3 times than that of the earth facing side. In the original design scheme, the main reinforcement on both sides of the diaphragm wall was symmetrically reinforced, and there was a large optimization space in the design scheme; the effect of crack control was not good only by increasing the amount of reinforcement. Under the condition of constant excavation depth and internal support spacing, after the asymmetric reinforcement optimization of the existing design, the reinforcement amount on the earth facing side and excavation side was reduced by 38.3% and 11.4% respectively, and the load sharing characteristics of the structure were more reasonable, which could greatly reduce the use of reinforcement, so as to reduce the project investment and construction scale.
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Received: 29 December 2021
Published: 20 March 2022
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