摘要
为了进一步优化交通隧道排水系统的设计方案,以贵南高铁九万山隧道为工程依托,基于渗流场和应力场双场耦合理论,以新型集水廊道底板型衬砌、中心排水沟底板型衬砌和传统泄水洞+仰拱型衬砌结构为研究对象,从围岩渗流场分布规律、衬砌结构排水泄压能力以及力学性能等方面综合评价结构的安全性、适用性,并在此基础上研究盲管间距对衬砌结构排水泄压能力的影响。研究结果表明:在60 m水位高度作用下,当环向盲管、泄水孔间距一定时,新型集水廊道底板型衬砌结构拱部、底板所受外水压力为294,158 kPa,其水压降幅比中心排水沟底板型衬砌高出17.5%,12.9%,比泄水洞+仰拱型衬砌高出15.1%,28.6%,可同时达到削弱拱部、底板外水压力的作用,且满足结构安全性的要求。采用新型集水廊道底板型衬砌时,其外水压力分布较为均匀,可避免采用泄水洞时产生类似偏压隧道作用带来的不良影响。
To optimize the design of drainage system in the Jiuwanshan tunnel of Guinan high-speed railway, we used the coupling theory of seepage field and stress field to research the drainage and pressure relief abilities of three kinds of lings with drainage function, namely the novel floor lining of catchment channel, the floor lining of central drainage ditch and the traditional structure of drainage tunnel+invert arch lining.The safety and applicability of the lining structure were comprehensively evaluated from aspects of distribution law of surrounding rock seepage field, drainage and pressure relief capacity of the lining structure and mechanical properties, etc.On this basis, the effect of circular blind pipe spacing on drainage capacity was studied.The results show that under 60 m ground water level, when the distance between the circular blind pipe and the drainage hole is constant, the external water pressure on the floor and arch part of the new type lining is 294 kPa and 158 kPa respectively, comparing with other two types of lings, the relief rate of water pressures are 17.5% and 12.9% higher than the floor lining of the central drainage ditch, and 15.1% and 28.6% higher than the traditional structure, demonstrating that the new type lining can reduce the water pressure at the arch and floor part, meeting the requirements of structural safety.The water pressure is evenly distributed in the new type lining, which can avoid the bias water load on tunnel when a drainage tunnel is applied.
作者
兰庆男
许芃
陶伟明
张志强
LAN Qingnan;XU Peng;TAO Weiming;ZHANG Zhiqiang(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610081,China)
出处
《人民长江》
北大核心
2022年第7期142-147,共6页
Yangtze River
基金
国家高铁联合基金项目(U1934213)
国家自然科学基金项目(51878572)
四川省科技计划项目(2019YFG0460)。
关键词
隧道排水
排水系统
底板型衬砌结构
排水泄压能力
盲管
drainage of tunnel
drainage system
novel floor lining of catchment channel
drainage and pressure relief capacity
blind tube
