摘要
针对目前隧道衬砌结构在运营中出现较多病害的现状,运用数值计算手段,建立三维有限元数值模型,对不同应力场软弱围岩公路隧道结构安全性进行了评价,详细研究了衬砌结构在不同应力场作用下出现裂缝时的应力和变形,研究结果表明:不同应力场,隧道衬砌结构均先在拱脚处出现裂缝;随着侧压力系数的增大,衬砌结构承载减小;拱脚处应作为隧道结构长期安全性应力监控的重点;另外,在λ为0.5、1.0的应力场中,边墙处压应力值也较大,而在λ为1.5的应力场中,拱顶处的压应力值较大;隧道结构在长期安全性变形的监控中,在λ为0.5的应力场中,边墙、拱顶处应重点监控;在λ为1.0的应力场中,拱肩、拱顶处应重点监控;在λ为1.5的应力场中,拱腰、拱顶处应重点监控。
On the basis of the disease characteristics of lining in long-term operation, the long-term safety of highway tunnel lining in different stress fields are evaluated, the stress and displacement of lining when lining cracked in different stress fields are analyzed, the inspection point of lining long-term safety is revealed through numerical simulation with 3D FEM models. The result shows that the cracks of highway tunnel lining always appear in the arch foot firstly; bearing load reduces with the lateral pressure coefficient increasing; arch foot should be the important site of long-term safety stress monitoring of tunnel structure; in addition, in the stress field that λ=0.5, 1.0,the compressive stress is greater at the site of sidewall, while in the stress field that λ=1.5, the compressive stress is greater at the site of vault ; in the long-term security displacement distortion monitoring of single-arch tunnels structures, when λ is 0.5 in stress field, the side walls, the vault should be the key monitoring object; when λ is 1.0 in stress field, the spandrel, the vault should be the key monitoring object; when λ is 1.5 in stress field, everywhere of the arch-waist, the vault should be the key monitoring object.
出处
《公路》
北大核心
2009年第2期189-193,共5页
Highway
基金
西部交通建设科技项目
项目编号200131800021
关键词
隧道工程
软弱围岩
应力场
结构安全
数值分析
tunnel engineering
soft-wreak surrounding rocks
stress field
structural safety
numerical simulation analysis
