Research On The Influence Of Shield Tunnel Tunnel Deformation Passing Through The South-to-North Water Diversion Canal

With the rapid development of cities along the route,the spatial contradictions between newly constructed projects and the main channel of the South-to-North Water Diversion Project will gradually become apparent,and therefore,project cross-cases will gradually emerge.The research on the deformation caused by the tunnel passing through the main channel of the South-to-North Water Diversion Project will have guiding significance for the later urban underground pipelines and traffic tunnel engineering.At present,there are few engineering examples for the main channel of the South-to-North Water Diversion Project,and the structural section size is small.The South-to-North Water Diversion Project in the shield tunnel running through water is still the first case in China.In this paper,the main channel project of the South-North Water Diversion Middle Route of Zhengzhou South Fourth Ring Road to the Suburban Railway Project of Zhengzhou City is used as the research object,and the statistical analysis method,empirical formula method,finite element numerical simulation and other methods are used to study the tunnel through the South-North Water Diversion Project.The formation of main canals caused by ground subsidence and its influence on the structure of main canals,The main content are as follows:(1)On the basis of being fully familiar with the actual project overview and characteristics,the Peck formula is applied to the study of the ground settlement caused by the tunnel passing through the South-to-North Water Diversion.Taking a certain section as an example,the statistical analysis of the monitoring data is carried out to obtain the corresponding Peck formula,and Compare and analyze the predicted value,actual data and fitted data of Peck formula;(2)Combining the monitoring data of other sections,and introducing the maximum settlement correction factor and settlement tank width correction factor,the Peck formula is corrected.The research results show that: when the maximum settlement correction coefficient m is between 0.7~1.1 and the settlement tank width correction coefficient k is between 0.5~0.8,the revised Peck formula is closer to the predicted curve than before the correction;(3)Using the ABAQUS finite element software to establish a three-dimensional model of the tunnel under the main canal,simulate and study the deformation of the bottom of the main canal caused by the single-line and double-line crossing of the subway tunnel under normal water level conditions and increased water level conditions,and compare the simulation results with the measured data analysis.The calculation results show that: under normal water level conditions,the maximum settlement of the main channel structure of the South-to-North Water Transfer Project is 7.41 mm after the single line of the subway tunnel passes,and the maximum settlement amount of the main channel structure of the South-to-North Water Transfer Project is 10.32 mm after the double line of the subway tunnel passes;After the single line of the subway tunnel passes,the maximum settlement of the main channel structure of the South-to-North Water Transfer is 7.64 mm,and after the double line of the subway tunnel passes,the maximum settlement of the main channel structure of the South-to-North Water Transfer is 10.51mm;combined with relevant engineering construction experience,it is proposed that before and during the crossing,Construction control measures after crossing effectively guarantee the smooth progress of the project.