高水压单线铁路隧道二次衬砌水压设计限值研究  

Study on Designed Water Pressure Limit on Secondary Lining for Single-Track Railway Tunnels with High Water Pressure

作　　者：王秀英 王北华[1] 谭忠盛[1] 王永红[1] WANG Xiuying;WANG Beihua;TAN Zhongsheng;WANG Yonghong(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《现代隧道技术》2018年第3期37-45,共9页Modern Tunnelling Technology

基　　金：国家自然科学基金资助项目(51178026;51478037)

摘　　要：随着我国高速铁路建设的快速发展,深埋长大山岭隧道的修建数量明显增加,隧道遭遇高水压的问题也更为突出。如何合理地进行高水压隧道的衬砌设计,是目前隧道工程界重点关注的问题之一,其中二次衬砌水压预测及设防等级的确定是制约设计的关键环节。文章通过对已建典型高水压隧道的分析及理论计算,研究了高水压隧道二次衬砌水压设计的限值。研究表明:(1)高水压隧道衬砌的设防等级应有一个上限;(2)二次衬砌厚度取值以不超过1 m为宜,继续增大厚度对提高结构安全性效果不明显;(3)单纯通过提高混凝土强度来达到提高二次衬砌结构承载力的目的并不是很理想,高水压隧道二次衬砌合理强度等级以取C40~C50为宜;(4)从衬砌安全性综合考虑,高水压隧道抗水压的最大限值以取1.2 MPa为宜,不宜过大。当实际预测水压超过此值时,应采取综合措施将衬砌水压调整在合理范围内。With the rapid development of China high speed railway, there is a dramatic increase of deep-buriedand long mountain tunnels, and more and more tunnels are disturbed by high water pressure during construction andoperation. Design for tunnel lining with high water pressure is one of the central concerns in the field of tunnel engi-neering, and the key problem is to forecast water pressure on the secondary lining and determination of water pressureresistance grade. The upper limit of water pressure on the secondary lining is studied by investigation and analysisin this paper. The study shows：（1） There should be an upper limit for the grade of water pressure resistance;（2） It isnot very effective to improve the tunnel structure bearing capacity by only increasing the lining thickness haphazard-ly, and the appropriate maximum thickness of secondary lining is 1 m;（3） It is also unsatisfactory to improve the tunnelstructure bearing capacity by simply increase concrete strength grade. The appropriate concrete grade is betweenC40 and C50.（4） In view of tunnel structure safety and good operation performance, the upper limit of water pressureresist grade should be no more than 1.2 MPa. When water pressure on the secondary exceeds the designed value,comprehensive measures should be taken to adjust the value to the appropriate range.

关 键 词：高水压隧道 衬砌厚度 强度等级 水压限值 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]