| In recent years,with the acceleration of urbanization,subway construction is also accelerating.Because of shield method high construction quality and low impact on the surrounding environment,its has become the preferred method for tunnel construction.However,due to the low frequency and high cost of the shield tunnel monitoring based on the traditional monitoring method,there are numerous accidents related to shield tunnels.With the development of wireless sensing technology,wireless intelligent monitoring has become more and more widely used due to its high monitoring frequency,saving manpower,less environmental constraints,and strong early warning capabilities.At present,wireless intelligent monitoring is mainly used in engineering fields such as houses,bridges,and railways,but it is still relatively rare in subway shield tunnels.In this paper,under the above background,Relying on a subway shield construction tunnel in a city,based on the wireless sensor network system,By means of signal transmission test,numerical simulation and engineering field application,the measurement point arrangement of wireless sensor network in shield tunnel was studied.The influence of different shield construction parameters on adjacent areas,the application of wireless sensing technology in subway shield tunnels.The main research contents and results are as follows:(1)Based on the numerical simulation of actual engineering,the research on the layout method of measuring points in wireless sensor networks is carried out.The numerical simulation results show that the deformation of the adjacent building section corresponding to the lining is relatively large,and the deformation of the top of the adjacent building is the largest.Based on the above numerical simulation results,combined with the signal transmission test and engineering practice,a wireless measurement point layout plan is formulated.(2)Based on the numerical simulation of the combination of different construction parameters such as excavation face support force and grouting pressure,the effect of different shield construction parameters on the adjacent area was studied.The results show that with the increase of excavation face support force and grouting pressure,the greater the effect of shield construction on the settlement of the ground and adjacent buildings,and relatively speaking,the excavation face support force suppression effect is better.This conclusion can provide reference for subsequent reduction of construction impact and optimization of construction parameters.(3)Relying on actual projects,the engineering application of wireless sensing technology was carried out.By comparing the perception results with numerical simulation and traditional construction monitoring results,The feasibility of the application of wireless sensing technology in areas affected by shield construction is verified,showing the advantages of wireless perception technology real-time dynamic perception,The health status of the building was analyzed based on the monitoring results of the sloping settlement of the adjacent building.The results show that the adjacent building is less affected by the shield construction and meets the normal use requirements. |
