深埋山岭隧道复合式衬砌水压力计算方法  

Calculation Method for Water Pressure on Composite Linings of Deep-Buried Mountain Tunnels

作　　者：张素敏 ZHANG Sumin(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Key Laboratory of Roads and Railway Engineering Safety Control(Shijiazhuang Tiedao University),Ministry of Education,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]道路与铁道工程安全保障省部共建教育部重点实验室(石家庄铁道大学),石家庄050043

出　　处：《铁道标准设计》2024年第10期129-134,共6页Railway Standard Design

基　　金：国家自然科学基金项目(51978424)。

摘　　要：富水山岭地区隧道衬砌结构设计中,采用限制排水方式由于可以兼顾隧道本身结构安全和周围环境的保护而逐渐被认同,目前多采用设置防水板和盲沟排水体系的复合式衬砌结构,对其二衬水压力,目前尚缺乏类似围岩压力的简单实用的方法。视二衬和防水板为堵水层,围岩-注浆圈-喷混凝土-盲沟为排水路径,基于整体式衬砌的渗流理论,推导出排水路径上总水头降与限排流量成正比,分析得出二衬和防水板外水压力为总水头与总水头降之差,可以省去根据盲沟排水系统流量换算二衬假想渗透系数的步骤,提出一种简易可行的复合式衬砌隧道二衬水压力的解析计算方法,可在设计阶段基于隧道允许排水量或二衬水压力直接进行二衬结构计算和围岩加固设计,实现对地下水的主动控制,确保衬砌结构安全。In the design of tunnel linings in water-rich mountainous areas,the limited drainage method has been increasingly recognized for balancing the structural safety of the tunnels and the protection of surrounding environment.Currently,composite lining structures with waterproof boards and blind drainage systems are commonly used.However,there is still a lack of simple and practical methods for calculating the water pressure on the secondary lining,similar to the methods used for calculating surrounding rock pressure.By regarding the secondary lining and waterproof boards as water-blocking layers,and surrounding rock-grouting ring-shotcrete-blind drain as the drainage path,this paper derives that the total head drop along the drainage path is proportional to the limited drainage flow,based on the seepage theory of monolithic lining.The water pressure on the secondary lining and waterproof board was found to be the difference between the total head and the total head drop,eliminating the need to convert the drainage system flow into an assumed permeability coefficient for the secondary lining.A simple and feasible analytical method was put forward for calculating the water pressure on the secondary lining of composite-lining tunnels.This method allows for direct structural calculation of the secondary lining and surrounding rock reinforcement design based on the permissible drainage volume or secondary lining water pressure during the design stage,enabling proactive control of groundwater and ensuring the safety of the lining structure.

关 键 词：深埋隧道 山岭隧道 复合式衬砌 水压力 渗流场 解析计算 

分 类 号：U25[交通运输工程—道路与铁道工程] U451[建筑科学—桥梁与隧道工程] U453.6