Significance Analysis of Influencing Factors for Bridge Rectification by High Pressure Jet Grouting
The method of high pressure jet grouting combined with stress release is a feasible technical measure to rectify the offset bridge pier.In order to further improve the efficiency of bridge rectification and quickly resume the normal and safe operation of high speed railway,based on the analysis of the principle of high pressure jet grouting bridge rectification,a theoretical model of bridge rectification was established.Based on the theory of elastic foundation beam,the analytical formula for calculating the displacement at the top of bridge pier was derived,and the main factors affecting the efficiency of bridge rectification were analyzed.Through the orthogonal test design method,the significance of the influencing factors of bridge rectification was discussed,and it is verified by a typical engineering case on site.The results show that the main factors affecting the efficiency of bridge rectification are soil foundation coefficient,excess pore water pressure and grouting construction depth.When the soil foundation coefficient applied by the stress release system is reduced,the daily rectification amount of the pier increases rapidly from 0.42 mm to 1.04 mm,with an increase of 148.8%.When the excess pore water pressure generated by the grouting pressure increases from 20 MPa to 25 MPa,the daily rectification amount of the pier increases from 0.39 mm to 0.86 mm,with an increase of 118.2%.When the grouting construction depth increases from 19 m to 24 m,the daily rectification amount of the pier increases from 0.24 mm to 0.40 mm,with an increase of 69.5%.The soil foundation coefficient has the most significant effect on the bridge rectification efficiency,followed by the excess pore water pressure generated by high pressure jet grouting,and the grouting construction depth has the least effect.The research results provide a theoretical basis for improving the efficiency of bridge rectification.
bridge rectificationhigh pressure jet groutingorthogonal experimental designsignificance analysisengineering case verification
万方数据
维普
