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| Study on tunnel segment uplift under the coupled effect of grout time-dependent properties and segmental friction |
| GUO Jianguang1, WANG Xing2, DONG Changchang3, XUE Yongbin1, WANG Shuangqing2, ZHAO Hongshuo3, WANG Han4, WANG Wenhu4
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1. China Railway Construction Investment Group Co., Ltd., Beijing 100070, China;
2. China Water Resources and Hydropower Fourth Engineering Bureau Co., Ltd., Xining 810007, Qinghai, China;
3. China Water Resources and Hydropower Eleventh Engineering Bureau Co., Ltd., Zhengzhou 450001, Henan, China;
4. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China |
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Abstract In order to systematically analyze the influence of grout time-dependency on tunnel segment buoyancy, a numerical model considering grout solidification time-dependency and inter-segment-ring friction was established using FLAC3D software. Comparative analysis with field-measured data jointly revealed the dynamic evolution characteristics and influencing mechanisms of segment buoyancy during tunnel excavation. The comparison demonstrated that the model accurately reflected the characteristic where segment buoyancy reached its maximum value near 10 m behind the shield tail and gradually stabilized, with the variation curve divisible into rapid growth, gentle growth, and stabilization phases. Parameter analysis and sensitivity analysis indicated that average grouting pressure most significantly affected cumulative buoyancy. When average grouting pressure increased from 0.3 MPa to 0.6 MPa, buoyancy increased by 42% with the highest sensitivity coefficient. Increasing depth-diameter ratio from 1.0 to 4.0 reduced buoyancy by 35% with secondary sensitivity, while increasing equivalent layer bulk modulus from 1.8 MPa to 3.6 MPa decreased buoyancy reduction to merely 11% with lower sensitivity. The research results provide data support for refined prediction and control of segment buoyancy in tunnel construction.
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Published: 18 June 2025
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