松动圈对隧道扩挖施工中既有衬砌结构力学影响的分析

Analysis of Influence of Loose Ring on Mechanical Effect of Existing Lining Structure in Tunnel Excavation Construction

依托杭州市砚岭隧道扩挖施工,通过数值计算和现场实测,研究隧道围岩松动圈对扩挖施工中既有衬砌结构的力学影响。数值模拟结果与现场实测数据进行对比分析表明,相较未考虑松动圈,考虑松动圈后的衬砌结构应力特征变化明显,且数值计算结果与现场实测结果更加吻合。

Relying on the expansion and excavation construction of Yuling Tunnel in Hangzhou City, the numerical analysis and field measurement were carried out to study the mechanical influence of loose rock surrounding tunnel on the existing lining structure during the excavation and construction. The comparison between the numerical simulation results and the field measurement data shows that the stress characteristics of the lining structure after loosening ring change significantly compared with the loose ring, and the numerical calculation results are more consistent with the field measurement results.