Tunnel induced pipeline damage has become a big issue

The research objective is to guarantee the normal use of pipeline in safe construction of metro tunnel

and provides technical support for safety and high efficiency construction of metro tunnel.Based on Winkler elastic foundation beam theory model

when the pipelines are parallel and perpendicular to the tunnel

the deformation calculation formula of the rigid connection pipelines affected by tunnel construction is derived in this paper.The theoretical analysis shows that there are main influencing factors such as tunnel diameter

distance from pipeline to tunnel

settling tank width coefficient

pipe diameter

pipe wall thickness

pipe material elasticity modulus

underlying rock soil elasticity modulus

characteristic coefficient

Poisson’s ratio and stratum loss.Taking the Tong-Hu interval tunnel of Xi’an metro Line 3as the background

pipeline deformation monitoring scheme was drawn up.The engineering practice shows that the calculation results from theoretical prediction formula are consistent with the actual ones.