考虑排水体系时隧道突涌水分析  

Analysis of tunnel water inrush considering drainage system

作　　者：傅鹤林[1] 安鹏涛 伍毅敏[1] 成国文 FU Helin;AN Pengtao;WU Yimin;CHENG Guowen(School of Civil Engineering,Central South University,Changsha 410075,China;Guangdong Nanyue Transportation Investment&Construction Co.,Ltd.,Guangzhou 510101,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]广东省南粤交通投资建设有限公司,广东广州510101

出　　处：《铁道科学与工程学报》2022年第11期3335-3342,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金面上项目(51978668);广东省交通运输厅课题(DFH201904YS1-001)。

摘　　要：涌水量理论计算时多忽视支护结构内缘承担的水头,导致现有涌水量预测计算式精度较差。为解决该问题,构建考虑支护结构内缘承担水头的深埋隧道涌水简化计算模型,基于地下水力学理论及达西定律推导涌水量及支护结构承受水头的计算式,通过退化分析及工程案例检验涌水简化计算模型构建的有效性及公式推导的正确性。在此基础上对相关特征参数进行敏感性分析,探讨隧道涌水影响机理,揭示各支护结构及排水体系对隧道涌水的影响机制。研究结果表明:考虑排水体系时推导的涌水量计算式可退化到忽略支护结构内缘承担水头时的计算表达式,考虑支护结构内缘承担的水头时,隧道涌水量预测误差可由9.8%降低为6.1%,一定程度上提高了预测精度;富水区隧道结构设计时应先对支护结构进行计算,当仅设计支护结构无法同时满足受力及涌水时须设置注浆加固结构;适当提高注浆圈的抗渗性能可有效降低隧道涌水量,注浆设计时须对注浆圈厚度及渗透系数进行合理取值;环向盲管间距减小及土工布厚度增大均会加强隧道三维排水体系,导致排水作用增强,进而影响隧道涌水量及各结构承担的水头。In the theoretical calculation of water inflow, the head borne by the inner edge of the support structure is often ignored, which can result in the poor accuracy of the existing prediction and calculation formula of water inflow. In order to solve this problem, a simplified calculation model of water inflow of deep buried tunnel considering the water head borne by the inner edge of supporting structure was constructed. The calculation formulas of water inflow and water head borne by supporting structure were deduced based on underground hydraulics theory and Darcy’s law. The effectiveness of the simplified calculation model and the correctness of formula derivation were verified by degradation analysis and engineering cases. On this basis, the sensitivity analysis of relevant characteristic parameters was carried out. The influence mechanism of tunnel water inflow was discussed. The influence mechanism of each support structure and drainage system on tunnel water inflow was revealed. The results show that the calculation formula of water inflow deduced when considering the drainage system can be reduced to the calculation formula when ignoring the head borne by the inner edge of the support structure. When considering the head borne by the inner edge of the support structure, the prediction error of tunnel water inflow can be reduced from 9.8% to 6.1%, which improves the prediction accuracy to a certain extent;In the design of tunnel structure in water rich area.The supporting structure shall be calculated first. When only the supporting structure can not meet the stress and water gushing at the same time, the grouting reinforcement structure shall be set. Properly improving the impermeability of the grouting ring can effectively reduce the water inflow of the tunnel. The thickness and permeability coefficient of the grouting ring must be reasonably taken in the grouting design. The decrease of circular blind pipe spacing and the increase of geotextile thickness will strengthen the three-dimensional drainage sy

关 键 词：涌水量预测 达西定律 退化分析 注浆加固 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]