Study On The Upper Building Caused By Deformation Of The Ground Surface Of Qingdao Subway Tunnel Excavation

Based on the research subject of the first-phase Qingdao subway (line3)"Qingdao subway excavation of buildings on the ground and assess the damagecontrol technology"(number: SDSITC-0108310), this paper carried out numericalsimulation, on-site monitoring and other aspects of research on the upper buildingdamage caused by surface deformation,surface subsidence of tunnel excavation andblasting vibration. The contents include the following aspects:(1) In this paper, ANSYS software is used to simulate the tunnel (using theconstitutive model, Drucker-Prager selected Solid45entity) caused by the excavationof formation stress and strain change. The influence of excavation shall be deductedthe initial stress caused by stratum stress and deformation analysis of tunnel in. Inaddition, ANSYS software simulation of tunnel excavation and support is realized bythe unit of "life and death" function.(2) The following conclusions are obtained by numerical simulation of tunnelexcavation process of tunnel excavation, the vault: the sinking, the sides of an arch toarch tunnel convergence, the bottom upward; surface cross section settlement curve ofnormal distribution, the shape of the curve obtained with the Peck formula one;surface horizontal displacement curve along the axis symmetric distribution vaultsedimentation value, on both sides of the opposite direction; the vault in the distancenear the area of tunnel face sinking velocity, when reaching a certain distancedeformation tends to be stable, and the vault settlement curve shape exponentialdistribution.(3) In order to verify the numerical simulation of the surface subsidence value isaccurate, the values and the simulated results were compared and analysis of groundsurface settlement in the practical detection, found that although there are errors insimulation and actual results, but the overall process of change are the same, thesimulation data obtained is of guiding significance for practical engineering.(4) Through the finite element calculation, the building structure in the influenceof surface subsidence and blasting vibration stress distribution of yield degreefunction, combined with the damage distribution structure and evolution of Ottosenand over-Wang failure criterion. Thus the different settlement and the blastingvibration velocity impact quantitative assessment and control of building structuresunder the crack. In this paper, the conclusion that analyzed by theoretical analysis, and sitemonitoring can provide some reference for the future similar Qingdao subway tunnelengineering design and construction.