华东交通大学学报2025，Vol.42Issue(3)：31-39,9.
管棚支护下软岩隧道掌子面稳定性研究
Study on the Stability of Tunnel Face of Soft Rock Tunnel Under the Pipe Shed Support
摘要
Abstract
To reveal the reinforcement mechanism of pipe shed support on the tunnel face of soft rock tunnel and evaluate the stability of the tunnel face under pipe shed support,the numerical simulation method is used to com-pare and analyze the failure mode of tunnel face with or without pipe shed support.Then,based on the numerical simulation results,a new parabolic arch-logarithmic spiral tunnel face failure model considering pipe shed sup-port and soil arch effect was proposed,and the calculation method of tunnel face safety factor under pipe shed support was derived by upper bound limit analysis method and strength reduction method.Finally,the influence of surrounding rock parameters and pipe shed support parameters on the stability of tunnel face was discussed.The research results indicate that when the instability failure of the tunnel face without pipe shed support occurs,the surrounding rock above the tunnel face forms a large collapse arch and a small collapse arch.Because of the pipe shed support,the instability failure of the tunnel face dose not develop to the vault.Meanwhile the pipe shed support prevents the formation of local collapse arch above the unsupported section,and makes the displace-ment direction of the surrounding rock above the unsupported section change from vertical downward to extru-sion to the tunnel face.The safety factor of tunnel face stability increases with the increase of internal friction an-gle,cohesion of surrounding rock and the size of pipe shed,and increases with the increase of single excavation length and pipe shed spacing.Too large size of the pipe shed is not economical for enhancing the stability of the tunnel face.关键词
掌子面稳定/管棚支护/土拱效应/极限分析/安全系数Key words
tunnel face stability/pipe shed support/soil arching effect/limit analysis/safety factor分类
交通工程引用本文复制引用
胡瑞奇,张海娜,杜可,江学辉..管棚支护下软岩隧道掌子面稳定性研究[J].华东交通大学学报,2025,42(3):31-39,9.基金项目
江西省防灾减灾及应急管理重点实验室项目(20212BCD42011) （20212BCD42011）
