摘要
传统边沟排水方式在水压力控制方面存在固有不足,隧底水压力普遍较高,致使仰拱变形超限、结构裂损等病害仍时有发生。基于此,介绍了排水能力强、降压效果优的体外排水方式,提出了体外排水隧道渗流场理论模型,通过多种研究手段验证了理论模型及其解析解的正确性。基于理论模型,探讨了排水洞埋深、半径对排水洞涌水量、隧道外水压力的影响规律,并结合工程实际制定了合理的排水参数。以南阳隧道为依托,开展了体外排水方式的现场应用,现场效果表明隧底排水洞的设置能够较好控制仰拱下方的外水压力,可有力防控因隧底水压力过大引发的相关病害。研究成果以期为富水地层隧道排水方式选型及参数制定提供借鉴与参考。
The traditional side ditch drainage method has inherent deficiencies in water pressure control.The high tunnel bottom water pressure may from time to time cause failures such as overshoot deformation and structural damage.Based on this,an external drainage way with strong drainage capacity and excellent pressure reduction effect was introduced.The theoretical model of the seepage field of the external drainage tunnel was put forward,and the correctness of the theoretical model and the analytical formula was verified by a variety of methods.Based on the theoretical model,discussion was made on the influence of the buried depth and radius of the drainage tunnel on the water inflow of the drainage tunnel and the water pressure outside the tunnel,followed by the development of reasonable drainage characteristic parameters in combination with the engineering practice.Based on the Nanyang tunnel,the field application of external drainage was carried out.The field results show that the design of the drainage tunnel at the bottom of the tunnel can better control the external water pressure of the bottom structure,and can effectively prevent and control the occurrence of failures caused by the excessive pressure of the tunnel bottom water.This paper provides reference for drainage type selection and parameter formulation of tunnel in water rich stratum.
作者
李林毅
阳军生
王树英
包德勇
高超
LI Linyi;YANG Junsheng;WANG Shuying;BAO Deyong;GAO Chao(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2020年第10期118-126,共9页
Journal of the China Railway Society
基金
高铁联合基金资助项目(U1934211)
新疆维吾尔自治区重大科技专项(2018A03003)
中央高校基本科研业务费专项资助项目(2019zzts291)。
关键词
体外排水方式
渗流力学
渗流场解析
排水参数研究
现场测试
external drainage
percolation mechanics
analytical study on seepage field
analysis of drainage parameters
field test
