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| In-situ experiment on composite foundation of high pressure jet grouting piles of Hong Kong-Zhuhai-Macau Bridge |
| WANG Yanning1，2，JIANG Binsong1，YU Jian2，GAO Chao2，FANG Dayong3 |
(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221008，China；2. Tianjin Port Engineering Institute，China Communications Construction Company
Limited(CCCC)，Tianjin 300222，China；3. Guangdong Provincial Research Institute of Water Resources
and Hydropower，Guangzhou，Guangdong 510000，China) |
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Abstract Several ground treatment methods were applied in the joint section of the island and the tunnel of Hong Kong-Zhuhai-Macau Bridge(HZMB) to reduce the deformation of the foundation below the tunnel. Part of the ground under the tunnel was treated with the preload and the high pressure jet grouting piles(JGP). There is more than 10 meters backfilled sand layer over the treated foundation. The current field tests such as the core bowling，the standard penetrate test(SPT) and plate test are not suitable for evaluating the reinforcement effect. A full scale load test based on the Boussinesq theory was designed with the heaped load method to simulate the additional stress distribution of the immersed tube tunnel foundation. The good settlement results were obtained utilizing a serial of pre-embedded high precision hydrostatic levelling systems(HLS). The tangent modulus method considering the impact of modulus nonlinearity was employed for calculating the nonlinear settlement of the soft ground. The calculated results were compared with the experimental data and the numerical simulation results. The results obtained using the calculation model are quite close to the field measured data.
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2017, Vol. 36 
