在役公路隧道素混凝土衬砌裂缝稳定性分析  

A Fracture Mechanics-based Approach for Crack Stability Analysis of Liner in Highway Tunnel

作　　者：王亚琼[1,2] 刘占良[3] 张素磊[4] 邱军领 谢永利[1] 

机构地区：[1]长安大学陕西省公路桥梁与隧道重点实验室,陕西西安710064 [2]弗吉尼亚理工大学土木工程与环境工程系,弗吉尼亚黑堡va24061 [3]石家庄铁路职业技术学院铁道工程系,河北石家庄050041 [4]郑州大学土木工程学院,河南郑州450001

出　　处：《中国公路学报》2015年第7期77-85,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51408554);河南省教育厅科学技术研究重点项目(14B560026);广西科技厅科技攻关项目(桂科攻10124006-10);中央高校基本科研业务费专项资金项目(2013G1502027;2013G3214011);国家留学基金委项目(201306565019)

摘　　要：为评判运营公路隧道衬砌结构裂缝的稳定性,建立了一种基于断裂力学的公路隧道素混凝土衬砌裂缝稳定性理论分析方法。结合85座公路隧道检测出的3 561条衬砌裂缝,从衬砌裂缝类型、分布位置、所处围岩级别、裂缝长度与宽度等方面系统总结了衬砌裂缝的规律;基于断裂力学理论将素混凝土衬砌裂缝划分为Ⅰ型裂缝和Ⅰ-Ⅱ型复合裂缝,并结合2种裂缝的断裂判据建立了裂缝稳定性系数f;采用有限元软件ANSYS的断裂模块可计算出衬砌裂缝尖端的应力强度因子,进而得到f值,并据此对衬砌裂缝的稳定性进行判定。结果表明:在恒定围岩压力作用下,基于断裂力学的公路隧道素混凝土衬砌裂缝稳定性分析方法可实现对在役公路隧道素混凝土衬砌裂缝稳定性的评判。In order to analyse the lining crack stability of operating highway tunnels, a theoretical analysis approach for the crack stability of plain concrete lining in highway tunnel based on fracture mechanics was established. Combined with 3 561 lining cracks measured in field in 85 highway tunnels, lining crack law was concluded from the following aspects, the type and location of cracks in linings, the grade of surrounding rocks, and the length and width of cracks. According to fracture mechanics theory, the lining cracks of plain concrete were divided into two different categories, Ⅰ-type and Ⅰ- Ⅱ type. The crack stability index was established based on fracture criterion of two types of cracks. Finite element software ANSYS fracture module was adopted to calculate the stress intensity factor at the crack tip in linings. The stability index f was calculated from the finite element analysis to determine the stability of cracks in linings. The results show that under a constant loading pressure in the surrounding rock around the tunnel as research object, crack stability of plain concrete lining in operating highway tunnel can be evaluated by lining crack stability analysis approach based on fracture mechanics.

关 键 词：隧道工程 衬砌裂缝 数值分析 应力强度因子 稳定性 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]