Study Of Shallow Mulit-arch Tunnel Construction Safety Control Technology Under The High-rise Building

As the traffic tunnel is striding from the mountains turn to the cities, theunderground place between the tunnel and building is becoming more and more crowed.It’s still lack of knowledge and study about the construction of traffic tunnel under thetall buildings.This paper we study the section of two-way four-lane arch connecting tunnel ofChongqing Liangjiang bridge, which is through the Huaxia Bank, through the tunnel-housing construction interaction mechanism and building deformation inducedsubsidence damage level and standard,combining the numerical simulation and on-sitemonitoring to analyze the dynamics mechanism of the14-storey Huaxia bankbuilding,which is neighboring the Yuzhong connection tunnel, and systematicallystudying the construction mechanicsm and the supporting structure of the arch tunnel,and investigating the key parameters of the urban traffic tunnel interaction with existinghigh-rise buildings.The paper is mainly reflecting:①summarizing the method and theoretical research of the proximity tunnelconstruction.②Deeply analysing the interaction mechanism of the tunnel and housingconstruction, revealing the ground displacement characteristics and the impact on theupper part of the building which is induced by the tunnel excavation, proposing thecompression/tensile strain deformation indicator parameters; combining throughdomestic norms, a comprehensive analysis of urban traffic tunnel deformation、indicators proximity rise building control standards and damage levels. Based on thestudies above, determining Building deformation control standards of the Yuzhongsegment connecting tunnel through Huaxia Building.③Establishing a full three-dimension numerical model, studying the step-sequence、rock and supporting structural mechanics effect of the connection tunnelduring excavation (displacement field, stress field, the plastic zone, the guide hole andinitial support and second lining stress), pointing out that the guide hole, the hole on theleft and right is the key tunnel excavation of the arch tunnel excavation processes.④Studying the Huaxia Building dynamic mechanical analysis (structural force,overall oblique, foundation settlement and differential settlement), pointing out thatright-tunnel excavation has the greatest impact on basis settlement which is close to the Huaxia bank building, and being stable when the cross-section through the base isabout1times the hole diameter.⑤Demonstrating the feasibility of the left hole-first construction method of theYuzhong-huaxia Building segment of connecting tunnel, the left hole-first (departingfrom Huaxia Bank side)、then right hole (near the Huaxia Bank side) is proposed using,this excavation method is advantageous for controling foundation deformation of theHuaxia Bank building.⑥Monitoring the key section of the Yuzhong connection tunnel segment throughHuaxia building (house oblique, crown settlement, the surrounding displacement、surface subsidence) and comparing with the result of numerical analysis to verify thereliability of the numerical result.⑦This paper analyzed the respective response of the mutual influence of the tunneland building (offset, height difference, hole diameter, construction method and otherfactors). The analysis result shows that when the tunnel is located in building’sfoundation-side-edge position is the most unfavorable position.