Segment opening calculation of shield tunnel based on double-sided elastic foundation beam when tunnel followed by well excavation

 

Yang Chunshan

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, 510641, China
e-mail: soildoctor@163.com

Mo Haihong

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, 510641, China
e-mail: cvhhmo@scut.edu.cn

Chen Junsheng*

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, 510641, China
*Corresponding Auth
e-mail: jschen@scut.edu.cn

Li Jinhua

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong, 510641, China

 

 ABSTRACT

In view of the characteristics of longitudinal deformation and segment circumferential opening, tunnel is regarded as continuous long beam which locates in Winker foundation, vertical deflection differential equation was built when tunnel comes firstly and then working well is excavated based on double-side elastic foundation beam and corresponding solutions were calculated. And then the equivalent continuous theory was combined to obtain calculation equation of segment opening, which can provide basis for segment opening calculation when tunnel comes firstly and then working well is excavated. Comparing results of theory analysis with numerical results indicates that the calculation results calculated by double-side elastic foundation beam are consistent with numerical results and the method proposed in this work can effectively predict segment opening during the shield construction phase.

Keywords: shield tunnel; segment opening; double-sided elastic foundation beam; numerical analysis; tunnels come firstly and then working well is excavated

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