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| Exploration on the Key Control Parameters of High Pressure Jet Grouting Rectification Technology |
| CHEN Zhan, ZHU Jiangjiang, PENG Zhipeng, ZHOU Yong, CHEN Kan |
| China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063, China |
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Abstract Research purposes: A large number of practices have proved that it is a feasible technical measure to rectify the deviation of bridge by high pressure jet grouting. Through the analysis of the principle of bridge correction by foundation treatment, the theoretical model of soil erosion and damage by cement slurry jet was established. Based on the high pressure jet theory, taking maximum correction amount and minimum rebound amount, and the best correction effect as the basic solution conditions, the expression of key control parameters of rectification construction was derived, the best rotation and lifting speed of drill pipe, and the outlet pressure and the water-cement ratio of the cement slurry nozzle were determined, and were verified with the actual correction effect of typical project on site.
Research conclusions: (1) When the nozzle diameter is fixed, the cement slurry jet power is proportional to the 3/2 power of the nozzle outlet pressure and inversely proportional to the 1/2 power of the cement slurry density, increasing the grouting pressure can effectively increase the jet power, and achieve a better correction effect; (2) Taking the formation conditions of construction case, the best rotation and lifting speed of drill pipe are 25.1 r/min and 16.3 cm/min respectively, the nozzle outlet pressure of the cement slurry should be 5 MPa, and the water-cement ratio should be controlled at 0.8 ∶1.0; (3) The parameters calculated were used for actual project, a good rectification effect was achieved, which indicates that the theoretical model and calculation parameters established can be used to guide the actual construction; (4) The research results can provide practical parameters for bridge correction by foundation treatment, and achieve the optimal rectification effect.
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Received: 06 December 2021
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2022, Vol. 39 
