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| Soil Disturbance Analysis and Settlement Control of Rectangular Pipe Jacking with Super Large Section |
| JIANG Liutao1, LI Hongbo2 |
1. Shaanxi Railway Institute, Weinan, Shaanxi 714000, China;
2. State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, Henan 450001, China |
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Abstract Research purposes: The soil disturbance and settlement control in the construction of super-large section pipe jacking is very important to the risk control of the whole project. In order to explore the soil disturbance law and settlement control method of super-large section rectangular earth pressure balance pipe jacking, based on the pipe jacking project of Zhengzhou Hongzhuan Road crossing Zhongzhou Avenue, through the pipe jacking model and numerical solution analysis of soil settlement, the influence law of pipe jacking process parameters on soil deformation is deeply analyzed.
Research conclusions: (1) The numerical solution of soil settlement under different factors of rectangular pipe jacking is consistent with the measured value, which verifies the accuracy of the numerical model solution. (2) Through the analysis of the influencing factors of soil disturbance, it is found that the friction coefficient of mud jacket has little influence on the ground settlement, and the proper increase of thrust and grouting pressure can inhibit the ground settlement. It is suggested that the thrust should be slightly greater than 1 time of the central earth pressure of the face, and the grouting pressure should be controlled within 2 times of the overlying soil pressure. (3) The comprehensive application of anti-back soil design, pipe joint wax coating, thixotropic mud, slag improvement, grouting and friction reduction, has a significant effect on reducing soil disturbance and settlement control of large-section pipe jacking. (4) The research results can provide reference for super-large section rectangular earth pressure balance pipe jacking engineering.
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Received: 19 August 2022
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2023, Vol. 40 
