施工期盾构隧道管片衬砌裂损病害统计分析  

Statistics and Analysis of Cracking Disease in Segment Lining for Shield Tunnel in Construction Stage

作　　者：卢岱岳[1] 孙文昊[2] 苏昂[1] 何川[1] LU Dai-yue;SUN Wen-hao;SU Ang;HE Chuan(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;China Railway Siyuan Survey and Design Group Co.Ltd,Wuhan,Hubei 430071,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]中铁第四勘察设计院集团有限公司,武汉430071

出　　处：《铁道工程学报》2018年第6期59-66,87,共9页Journal of Railway Engineering Society

基　　金：国家重点研发计划课题(2016YFC0802202;2016YFC0802205);中国铁路总公司科技开发计划重点课题(2014G004)

摘　　要：研究目的:针对某地铁盾构隧道工程施工期管片衬砌结构大范围开裂及脱落现象,对管片裂损病害的形态特征、分布规律以及危害程度进行统计分析,以期探明多种施工因素影响下管片衬砌结构的裂损机理,从而为隧道维修养护提供参考。研究结论:(1)管片裂损按照所占比例由大到小依次为:拱顶脱落、纵向裂纹、边角部裂损,拱顶脱落及纵向裂纹是施工期影响管片质量的最主要因素,且管片裂损病害的主要致因包括不良千斤顶推力作用(推力过大和推力不均)、管片错台以及管片环间接触面不平整等因素;(2)纵向前裂纹数量更多、波及范围更广、病害程度更深,是威胁隧道结构承载力及耐久性的最主要病害形式;(3)拱顶脱落对隧道结构的纵向受力特性影响较大,但其发生、发展与管片结构榫槽设置有关,通过对管片参数的优化、调整能够有效降低这一管片病害的发生;(4)该研究对于盾构施工控制具有指导意义。Research purposes： In view of a large scale of cracking and abscission phenomenon in the segement lining structure for a metro shield tunnel in the construction stage,the morphological characteristics,distribution and damage degree of segment cracks are analyzed statistically,and the cracking mechanisms of segment lining under various construction factors are also discussed,to provide reference for tunnel maintenance.Research conclusions：（1） The segment cracks are divided into the following steps： the vault abscission,longitudinal cracks and corner cracks. The vault abscission and longitudinal cracks are main factors affecting the quality of the segment in construction periods. And the main cracking factors of segment cracks mainly include defective jacking forces（excessive and inhomogeneous forces）,segment dislocation and unevenness contact surfaces between segment rings.（2） The cracks in front of the segment lining,with larger quantity,wider range and more serious degree of diseases,are the most important forms that threaten the bearing capacity and durability of tunnel structures.（3） The vault abscission of tunnel has an effect on longitudinal stress characteristic. Its occurrence and development are related to the location oftongued and grooved in segment structure. The occurrence of this disease can be effectively reduced by optimizing and adjusting segment parameters.（4） This research has strong application value for construction control of shield tunneling.

关 键 词：盾构隧道 施工阶段 管片裂损 病害统计 裂损特征 

分 类 号：TU447[建筑科学—岩土工程]