Tunnel construction will cause the deformation of overlying building and the deformation may affect the using function of buildings and structural safety.Focusing on the problem of forked tunnel passing building

the housing construction standards.The coal mining industry standard

track traffic experience standards

foreign standards and research results are analyzed.The foundation settlement and incline index in the national housing construction standard is proposed to be the control index

in which the deformation increment caused by tunnel construction and the existing deformation of buildings should be both considered;after the establishment of deformation standard

Peck formula is firstly used to make a preliminary determination with no building

when the deformation does not meet the standard requirements and the modified stiffness method or numerical simulation method is needed.Engineering example analysis by this evaluation method shows that the maximum tension stress point is at the invert of the forked section

and the maximum foundation settlement is also at this section.The building deformation meets the requirements when only considering the incremental deformation due to tunnel construction

but will not meet the requirements of standard when considering the existing building deformation.The evaluation analysis must consider the deformation of existing buildings.