Case Study on Deformation Damage of Masonry Building Caused by Lateral Crossing of Shield Tunnel
Most of the research into lateral crossing of masonry building by shield tunnel conducted so far is focused on analysis of settlement and overall inclination of the masonry building.A masonry building that experiences differen-tial settlement is susceptible to cracking,so the aforesaid two indicators are not enough to analyze the crack damage of the building.The numerical simulation calculation of lateral crossing of shield tunnel that uses conventional con-stitutive model does not take into account the unique structure of masonry building or the crack and stress of the ma-sonry building.In this study,therefore,the lateral crossing of Malaqin Restaurant by the shield tunnel of Hohhot Metro Line 1 is used as the example.In the numerical simulation,finite element calculation is conducted by using the jointed masonry constitutive model.The differential settlement and strain of the building resulting from lateral crossing by the shield are analyzed by using the measurement data.As the results indicate:(1)After lateral crossing of the masonry building by a shield tunnel,the cracking area of the masonry building develops from the bottom up,the tensile strain is mostly concentrated at the lowermost part of the building,and most tensile strain regions are related to the position of the door opening.(2)The differential settlement areas of the masonry building are concentrated at the door and window openings,and the areas with major differential settlement are the areas with major strain which are more susceptible to cracking.(3)As the cohesion of masonry mortar increases,the strain and differential settle-ment of the masonry building gradually decrease,and the areas on the masonry building that are susceptible to cracking gradually decrease.
Lateral crossing by shieldMasonry buildingJointed masonry modelTensile strainSmall strain hardening model
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