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| Construction stability of deeply buried highway tunnel through fault fracture zones in mountainous areas |
| YANG Li1, XIA Zengxuan2, LOU Wenjie2, LIU Shan2, LI Fengting3*, WU Ke3
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1. Zhaotong Dayong Expressway Investment and Development Co., Ltd., Zhaotong 657000, Yunnan, China;
2. Shandong Provincial Communications Planning and Design Institute Group Co., Ltd., Jinan 250101, Shandong, China;
3. School of Civil Engineering, Shandong University, Jinan 250061, Shandong, China |
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Abstract In order to investigate the stress and strain state of the surrounding rock and the effect of supporting structure of the deep buried tunnel through the fault zone in mountainous area, taking Lianfeng Mountain Tunnel Project as the research background, based on ABAQUS large-scale finite element numerical computation program, the mechanics calculation model of the construction of the deep buried tunnel through the fault zone was established, and the change rule of the structural stress state and the horizontal and vertical settlement rule of the mountain after the tunnel excavation and lining were studied. The results showed that the settlement in the fault zone during tunnel excavation was much larger than that in the normal rock body; the stress difference between the surrounding rock and the peripheral mountain body at the fault zone was larger, and the stress difference at the junction with the normal mountain body was larger; the settlement caused by tunnel excavation affected the range of 50 m, and the settlement at the center of the twin tunnels increased with the increase of vertical height; the excavation of the second tunnel in the construction of the twin tunnels caused the increase of the strain of the first tunnel.
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Published: 20 September 2024
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