铁道科学与工程学报2025，Vol.22Issue(3)：1202-1214,13.DOI:10.19713/j.cnki.43-1423/u.T20240872
衬砌厚度不足影响下通透肋式连拱隧道破坏规律试验研究
Experimental study on failure laws of permeable rib double-arch tunnel with insufficient lining thickness
摘要
Abstract
China's innovative permeable rib double-arch tunnel,an environmentally friendly mountain-adjacent tunnel,addresses the challenges of route selection for hillside sections of mountain expressways.However,this unique structural form and complex construction procedures inevitably result in local lining thickness deficiencies,which severely threaten the structural stability and safe operation of the tunnel.To clarify the catastrophic evolution process of permeable rib double-arch tunnels with insufficient lining thickness,a 1:40 scale model test was conducted based on the Nanshan Tunnel Project in Anhui Province.This study analyzed the failure evolution characteristics of the tunnel structure under three conditions:intact lining,insufficient lining thickness at the inner vault,and insufficient lining thickness at the right shoulder of the outer vault.By comparing the differences in lining failure patterns,surrounding rock pressure,lining internal forces,and structural deformation under these three conditions,the study aimed to reveal the failure mechanisms of permeable rib double-arch tunnels with insufficient lining thickness.The test results indicate that under biased pressure,failure first occurs in the rib-arch structure of the outer tunnel,irrespective of the presence of defects.The rib beam structure,as a typical failure location,exhibits early cracking at the interior of its connection with the crash wall,the exterior of the middle section,and the interior of its connection with the barrier plate.The middle section of the rib beam is the first to develop through cracks in the entire tunnel structure.Compared to intact linings,areas with insufficient lining thickness exhibit earlier crack formation.When the insufficient thickness is at the inner vault,cracks occur on both the inner and outer edges of the deficient area.When the insufficient thickness is at the right shoulder of the outer vault,cracks occur on the inner right side of the deficient area.Due to the reduced bearing capacity of the lining in the deficient area,the bending moment on the rib beam structure increases,exacerbating its damage,especially when the deficient area is near the rib beam structure.The research results can provide a technical foundation for understanding the mechanisms of failure and safety control measures for double-arch environmentally friendly mountain-adjacent tunnels in China.关键词
衬砌厚度不足/通透肋式连拱隧道/偏压/破坏规律/衬砌内力Key words
insufficient lining thickness/permeable rib double-arch tunnel/bias pressure/damage laws/lining internal force分类
交通工程引用本文复制引用
张旭,董烨炜,许有俊,王红港..衬砌厚度不足影响下通透肋式连拱隧道破坏规律试验研究[J].铁道科学与工程学报,2025,22(3):1202-1214,13.基金项目
国家自然科学基金资助项目(52168059) （52168059）
