Research On The Influence Of High-rise Building Construction On The Stability Of Adjacent Viaduct Near Xiaoyong Railway

In recent years,the land resources that can be developed in my country have been decreasing day by day.Therefore,high-rise building construction projects near existing viaducts continue to emerge,and the construction and operation of high-rise buildings will affect the structural safety and even normal use of the viaduct.This dissertation is based on the high-rise residential project near Xiaoyong railway viaduct in Shaoxing City,which establishes a finite element model based on field data,and verifies its rationality.On this basis,the influence of each stage of high-rise building construction on the displacement of the adjacent viaduct is studied,and the displacement and internal force of the viaduct are the main stability indicators.The main contents and results are as follows:(1)This dissertation studies the theoretical calculation method of the surrounding soil displacement caused by the excavation and unloading of the soil.In addition,This dissertation Based on the practical engineering data in Shaoxing area,a numerical model is established to analyze the settlement and horizontal displacement law of the viaduct adjacent to the foundation pit of a new high-rise building in the excavation stage.It is concluded that in the excavation stage,the viaduct adjacent to the foundation pit has a tendency of overall displacement to the foundation pit,and the depth range of the pile foundation affected by the excavation of the foundation pit is twice the excavation depth,the maximum vertical displacement is 1.89mm;The displacement law of the bridge deck and the bridge pier is consistent,and both have settlement and displacement towards the foundation pit,and some displacements within the projected range of the foundation pit are larger than other areas,and the maximum horizontal displacement of the bridge pier is 5.48 mm.The internal force change at the top of bridge pier and abutment is mainly reflected at both ends,and the maximum is 0.6MPa.(2)This dissertation expounds the theoretical calculation basis of the additional stress of the foundation under the action of the high-rise building.In this dissertation,the numerical simulation of the construction phase of the superstructure of the high-rise building is carried out,and the displacement change law of the adjacent viaduct during the loading phase of the high-rise building is analyzed.The study found that the displacement of the adjacent viaduct during the loading stage of high-rise buildings is dominated by settlement,the maximum settlement value is 0.87 mm,and the distribution of settlement and horizontal displacement is centered on the midpoint of the viaduct,and gradually diffuses and decreases to both sides;the depth range of the viaduct pile foundation affected by the high-rise building loading is is the depth of the foundation pit envelope.The stress at both ends of the top of bridge pier and abutment is significantly greater than that in the middle area,and the maximum stress is 0.26 mpa.(3)On the basis of the completion of the loading of high-rise buildings,this dissertation analyzes the influence of different parameters on the stability of the viaduct by changing the parameters such as the horizontal distance between the high-rise building and the viaduct,and the height of the high-rise building.Finally,this dissertation proposes protective measures for the viaduct,and concludes that the settlement of the viaduct increases by 294% and the horizontal displacement increases by 157% after the demolition of the foundation pit envelope.(4)This dissertation analyzes the influence on the stability of the adjacent viaducts when the high-rise buildings are subjected to wind loads in different directions during the operation period after the completion of the construction.The settlement is the main one,and the horizontal displacement value is 10% of the settlement value.