运营隧道拱部衬砌厚度不足及脱空的危害与整治  

Research on Inadequate Lining Thickness and Dehollowing Hazards and Remediation in the Vault Area of Operational Tunnels

作　　者：嵇诚 龚伦[1] 樊永杰 张鹏 Ji Cheng;Gong Lun;Fan Yongjie;Zhang Peng(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,P.R.China;China Railway Chengdu Bureau Group Ltd.,Chengdu 610031,P.R.China)

机构地区：[1]西南交通大学,交通隧道工程教育部重点实验室,成都610031 [2]中国铁路成都局集团有限公司,成都610031

出　　处：《地下空间与工程学报》2024年第5期1706-1716,共11页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51478392)。

摘　　要：运营隧道拱顶存在衬砌厚度不足及脱空的情况十分常见,不及时整治可能会造成衬砌局部开裂、掉块等问题,威胁隧道运营安全。通过资料调研、数值计算及现场应用等方法,开展该类缺陷的危害性及整治措施研究。研究表明:以纵、环向2.0 m和6.0 m为界对衬砌厚度不足及脱空的严重程度进行了分级;当衬砌缺陷范围较小时,衬砌厚度变化对衬砌应力影响较小,当衬砌缺陷范围大于4 m 2、衬砌厚度小于设计厚度40%时会引起衬砌应力突变;当缺陷纵、环向单一尺寸大于2 m时,环向尺寸比纵向尺寸更易引起衬砌应力的变化;结合衬砌缺陷程度分级和衬砌厚度,对应提出了充填注浆、开窗修补和套衬3种整治方案;经依托工程实际应用,验证了缺陷程度分级的正确性、整治方案的可行性和有效性,可为隧道衬砌厚度不足及脱空的整治提供借鉴。Inadequate lining thickness and debonding are very common in operating tunnel vaults,which may cause local cracking and falling blocks in the lining and threaten tunnel operation safety if not rectified in time.By means of data research,numerical calculation and field application,the hazards of such defects and their remediation measures were studied.The study shows that:the severity of insufficient lining thickness and debonding is graded by 2.0 m and 6.0 m in longitudinal and circular directions;When the lining defect range is small,the lining thickness change has less effect on the lining stress.When the lining defect range is larger than 4 m 2 and the lining thickness is less than 40%of the design thickness,it will cause sudden change of lining stress;When the single size of defects in longitudinal and circular directions is larger than 2 m,the circular dimension is more likely than the longitudinal.When the longitudinal and circumferential single size of defects is larger than 2 m,the circumferential size is more likely to cause the change of lining stress than the longitudinal size;Combined with the grading of lining defects and lining thickness,three remediation schemes of filling and grouting,window repair and lining set are proposed;Based on the actual application of the project,the correctness of the grading of defects and the feasibility and effectiveness of the remediation scheme are verified,which can provide some guidance and reference for the remediation of insufficient tunnel lining thickness and dehollowing.

关 键 词：运营隧道 拱顶 衬砌空洞 衬砌厚度不足 整治方案 

分 类 号：U45[建筑科学—桥梁与隧道工程]