| With the rapid development of today's society and the acceleration of modern urbanization,the increase in urban population will cause the city's transportation system to face tremendous pressure.Solving the contradictions in the transportation within the city requires us to develop new ideas.The development of underground space is more and more valued by people.Underground rail transit can better solve the problems restricted by the upper conditions,and can have the advantages of high efficiency,large transportation volume,safety and environmental protection.However,no matter how reasonable the preparatory design of the subway project is,the excavation of its tunnels and stations are carried out in the complex underground rock and soil body of the city.Due to the uncertainty of the underground project itself,the underground construction process cannot be accurately predicted.The impact of surrounding rock and soil.During the construction of the tunnel,the ground subsidence phenomenon occurred due to the uncertainty of the surrounding rock and soil.This will have a significant impact on the safety of existing buildings within the upper impact area of the tunnel.Therefore,we must ensure the safety during the tunnel excavation process and the safe use of the superstructure,we need to conduct an in-depth study on the ground settlement caused by the tunnel excavation and the deformation and damage of the superstructure.This article takes the daily miscellaneous market under the existing steel structure in the upper part of the North Yatai Street Station of the Changchun Metro Line 4 to the Beiman Palace Station as the project example to rely on.The threedimensional "stratum-structure" model was established by MIDAS GTS NX finite element software and PKPM software for construction simulation.The research work and results of this article are as follows:(1)The numerical model is established through the MIDAS GTS NX finite element software,and the construction is carried out through simulation.Obtain the law of settlement caused by tunnel excavation.(2)Use PKPM software to bring in the absolute value of the foundation settlement,combined with the specifications,the safety rating of the upper structural members of the tunnel,and the structural reliability rating of the building.An evaluation method for subway tunnels passing through buildings is proposed to provide a reference for similar projects in the future.(3)According to the experience of similar projects at home and abroad,refer to the numerical simulation calculation results.The control index value is obtained for the existing daily market structure.At the same time,control points and suggestions are proposed for this project example.Ensure safe and orderly construction. |
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