富水区隧道衬砌水压力分布特征及排水系统降压能力研究  

Study on the water pressure distribution characteristics of tunnel lining and pressure-reducing capability of the drainage system in water-rich areas

作　　者：陈信朋 王朝熠 卢锋 李林隆 赵飞龙 熊成 罗崇俊 马凯蒙 CHEN Xinpeng;WANG Chaoyi;LU Feng;LI Linlong;ZHAO Feilong;XIONG Cheng;LUO Chongjun;MA Kaimeng(Guangxi Road Construction Engineering Group Company Limited,Nanning,Guangxi 530001,China;School of Emergency Management,Xihua University,Chengdu,Sichuan 610039,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang,Hebei 050043,China)

机构地区：[1]广西路建工程集团有限公司,广西南宁530001 [2]西华大学应急管理学院,四川成都610039 [3]石家庄铁道大学土木工程学院,河北石家庄050043

出　　处：《河北科技大学学报》2025年第2期225-236,共12页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(52408440);广西路建工程集团有限公司委托课题(222300,222302)。

摘　　要：为研究富水区隧道排水系统的降压能力,以贺州至巴马高速公路(来宾至都安段)凤凰二号隧道工程为依托,通过FLAC3D软件建立三维流固耦合数值模型,提出了一种新的排水系统降压能力综合评价方法,探究了环向排水盲管间距、围岩与初支渗透系数比和水头高度3种影响因素对降压能力的影响规律。结果表明:环向盲管对衬砌拱圈水压力有显著降低作用,衬砌拱圈、边墙部位水压力较大,仅次于仰拱;盲管间距在3~5 m范围内,衬砌拱顶水压沿隧道纵向变化特征呈现“M”型变化趋势,但盲管间距大于5 m时,盲管降压效果开始显著下降,水压沿隧道纵向变化特征转变为“平顶山”状;以综合受力指数、降压系数评价排水系统的降压能力,得到了排水系统降压能力预测公式,最大预测误差为8.25%,具有较高精度;3种因素对降压能力的影响大小顺序为环向盲管间距>围岩与初支渗透系数比>水头高度;若围岩与初支渗透系数比过大,排水系统降压效能将出现下降,可采取缩小盲管间距或对围岩进行注浆加固以增加排水系统降压效能;综合考虑多因素与降压能力变化规律、结构安全性与成本效益,将工程环向盲管间距设为5 m较为合适。所提排水系统降压能力综合评价方法适用性较好,可为富水区隧道工程防排水体系的设计施工提供参考。In order to study the pressure-reducing capacity of the tunnel drainage system in the water-rich areas,a three-dimensional fluid solid coupling numerical model was established using FLAC3D software based on the Fenghuang No.2 tunnel of the Hezhou Bama Expressway(Laibin to Du′an section).A new comprehensive evaluation method for the pressure-reducing capacity of drainage system was proposed to investigate the influence of three factors including the distance between circumferential drainage blind pipes,the ratio of permeability coefficient between surrounding rock and initial support,and the height of water head on the pressure-reducing capacity.The results show that the circumferential blind pipe has a significant reducing effect on the water pressure of the lining arch ring.The water pressure at the lining arch and side wall is relatively high,only lower than that of the inverted arch.When the distance of the blind pipes is 3~5 m,the water pressure at the top of the lining along the longitudinal direction of the tunnel exhibits an"M"shaped variation trend.However,when the distance of the blind pipes exceeds 5 m,the pressure reduction effect of the blind pipes begins to significantly decrease,and the variation characteristic of water pressure along the longitudinal direction of the tunnel changes to a"flat-topped mountain"shape.The pressure-reducing capacity of drainage system was evaluated by comprehensive stress index and pressure reduction coefficient,obtaining a prediction formula for the system pressure-reducing capacity.The maximum prediction error is 8.25%,indicating a high level of accuracy.The impact of the three factors on the pressure-reducing capacity is in the following order:the distance between circumferential blind pipes>the ratio of permeability coefficient between surrounding rock and initial support>the height of water head.The larger the ratio of surrounding rock to initial support permeability coefficient is,the lower the pressure-reducing efficiency of the drainage system is.It is necessar

关 键 词：隧道工程 富水隧道 环向排水盲管间距 渗透系数比 水头高度 降压能力评价 

分 类 号：U455.49[建筑科学—桥梁与隧道工程]