123 Analysis of the Affect of Heat Pipe Line Engineering Construction on the Settlement and Deformation Tunnels of Beijing Subway Line 10

Subway line deformation must be restricted to insure the safety during construction of heat pipe line over existing subway. Deformation analysis is an important content of monitoring the tunnel structure. The current understanding of the main tunnel deformation is Concentrated on the horizontal structure s, however, vertical deformation of the tunnel should be much more fragile. To study the affect of the construction of the heat pipe line on the tunnels of subway line 10, a large number of settlement points are placed on the tunnels surfaces. Through monitoring and analyzing the settlement and deformation of tunnels points following the construction and setting up monitoring and control network according to national standard, the affects of the heat pipe line construction is analyzed in details on the basis of rational design of deformation monitoring programs. The monitored results indicate that the construction of heat pipe line has a great influence on the tunnels deformation, settlement rate and cumulative settlement quantity. At last, modified grey model is proposed to predict the settlement quantity with credible results in this paper.