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Comparative Study on Reinforcement Schemes for Shield Tunnel
Under-crossing Railway Bridge with Isolated Shallow Foundation in
Water-rich Sand Stratum
(1. Jiangxi Local Railway Development Co., Ltd., Nanchang 330000; 2. School of Civil Engineering, Central South University, Changsha 410075; 3. The 2nd Engineering Co., Ltd. of China Railway Tunnel Group, Sanhe 065201)
Abstract In order to ensure the construction safety of shield tunnel undercrossing isolated shallow foundation rail?
way bridge in water-rich sand stratum, taking Nanchang Metro Line 4 undercrossing Qingshan Road overpass of Bei?jing-Kowloon Railway as the engineering background, the reinforcement measures of stratum grouting and cast-inplace raft foundation frame culvert are put forward by means of construction method comparison, numerical analysis and field monitoring. The law of track settlement is analyzed, and the effectiveness of reinforcement measures is verified. The results show that it is reasonable and effective to use stratum grouting and cast-in-place raft foundation frame culvert to reinforce the railway bridge and realize the control of track settlement before shield tunnelling. Compared with the condition without any reinforcement measures, the maximum value of track settlement is reduced by 83.53%, which is 1.88 mm. The field monitoring results show that the maximum settlement of the track is 1.45 mm after stratum grouting and cast-in-place raft foundation frame culvert reinforcement, which verifies the correctness of the numerical analysis results and the effectiveness of the reinforcement measures, and ensures the normal operation of the Beijing-Kowloon Railway.
Abstract：
In order to ensure the construction safety of shield tunnel undercrossing isolated shallow foundation rail?
way bridge in water-rich sand stratum, taking Nanchang Metro Line 4 undercrossing Qingshan Road overpass of Bei?jing-Kowloon Railway as the engineering background, the reinforcement measures of stratum grouting and cast-inplace raft foundation frame culvert are put forward by means of construction method comparison, numerical analysis and field monitoring. The law of track settlement is analyzed, and the effectiveness of reinforcement measures is verified. The results show that it is reasonable and effective to use stratum grouting and cast-in-place raft foundation frame culvert to reinforce the railway bridge and realize the control of track settlement before shield tunnelling. Compared with the condition without any reinforcement measures, the maximum value of track settlement is reduced by 83.53%, which is 1.88 mm. The field monitoring results show that the maximum settlement of the track is 1.45 mm after stratum grouting and cast-in-place raft foundation frame culvert reinforcement, which verifies the correctness of the numerical analysis results and the effectiveness of the reinforcement measures, and ensures the normal operation of the Beijing-Kowloon Railway.
OUYANG Hongzhi1 ZHU Dinggui2 AN Bin3 SHI Chenghua2
.Comparative Study on Reinforcement Schemes for Shield Tunnel
Under-crossing Railway Bridge with Isolated Shallow Foundation in
Water-rich Sand Stratum[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(5): 246-
2022, Vol. 59 