摘要
外水压力是影响隧洞安全稳定运行的关键因素。目前,外水压力的取值仍采用经验性或半经验性的方法,局限性较大。基于井流理论,采用水-岩分算的方式,通过地下水渗流原理推求圆形隧洞外水压力折减系数解析计算公式,并通过数值分析方法进行对比,将成果应用于城门洞形断面进行验证。结果表明,围岩条件即围岩的渗透性主要影响外水压力的大小;衬砌支护完成后,隧洞孔隙水压力会快速降低,然后逐渐趋于稳定,衬砌的阻水作用得到充分发挥;利用解析公式计算等效转换后的城门洞形断面,解析解与数值解误差不大,围岩的渗透性仍为主要因素。
The external water pressure is the key factor affecting the safe and stable operation of tunnel.Currently,the external water pressure is still valued by empirical or semi-empirical methods with great limitations.Based on well flow theory and water-rock split method,the calculation formula of reduction coefficient of external water pressure of circular section tunnel is derived by groundwater seepage principle,and the calculation results are compared with that of numerical analysis method.The arched tunnel section is taken as study example to verify the analytical calculation method.The results show that,(a)the surrounding rock condition,i.e,the permeability of surrounding rock,mainly influence the magnitude of external water pressure;(b)after lining support is completed,the pore water pressure of tunnel will first decrease rapidly and then stabilize gradually,indicating that the water-resisting function of the lining is fully exerted;and(c)the analytical solution of equivalent converted arched tunnel calculated by analytical formula is basically same with the results of numerical solution,and the permeability of surrounding rock is still the main factor.
作者
戚海棠
任旭华
张继勋
QI Haitang;REN Xuhua;ZHANG Jixun(College of Water Conservancy&Hydropower Engineering,Hohai University,Nanjing 210024,Jiangsu,China)
出处
《水力发电》
CAS
2023年第4期29-35,74,共8页
Water Power
基金
云南省重大科技专项计划项目(202102AF080001)。
关键词
深埋隧洞
外水压力
井流理论
折减系数
解析-数值法
deep tunnel
external water pressure
well flow theory
reduction coefficient
analytical-numerical method
作者简介
戚海棠(1998-),女,江苏淮安人,硕士研究生,主要研究方向为水工结构工程;通信作者:任旭华.
