【作者】 尹修全；

【导师】 黄涛；

【作者基本信息】 西南交通大学 ， 工程环境控制， 2012， 硕士

【摘要】 隧道工程建设中,地下水是影响隧道施工安全、工程质量及工程结构稳定的重要因素,也是隧道使用过程中的主要隐患,容易导致水土流失等环境问题。因此,掌握隧道区围岩中地下水分布及赋存规律,并建立水文地质模型,对隧道涌水量进行定量评价显得尤为重要。雪峰山1号隧道全长11679m,最大埋深约为840m,地层岩性复杂,隧道区分布有背斜、断层等地质构造,围岩类型丰富,属典型长大隧道。本文在进行雪峰山1号隧道地质环境及水文地质条件调查的基础上,所做具体工作如下：(1)分析观测资料,研究地下水的赋存特征及类型,结合地下水的补给、径流特征,掌握地下水变化与隧道施工涌水的关系。(2)将水力影响半径内隧道区划分为5个独立的水文地质区段并建立相应的水文地质概念模型。(3)在概化的基础上建立数学模型,然后通过含水系统的离散化、水文地质参数及定解条件的处理,运用Visual MODFLOW建立各水文地质区段的三维数值模拟模型用以模拟隧道开挖后渗流场情况。(4)利用模拟结果预测隧道区最大涌水量,并与常规涌水量预测方法结果进行对比分析增强预测准确性,最后提出在隧道施工建设和运营过程中需采取的防范措施,以减少由于涌突水而造成的各种危害。更多还原

【Abstract】 In the tunnel construction,groundwater is the main factor impacting the safety,quality and engineering structure stability of the tunnel construction,which is mainly hidden in the tunnel uses process and leads to soil erosion and other environmental issues. Therefore, the master of the groundwater in the tunnel area surrounding rock distribution and occurrence patterns, and the establishment of the hydrological model, quantitative evaluation to the tunnel water gushing is particularly important.Xuefengshan Tunnel No.1, total length of11679m, the maximum depth of about840m, distributes anticlines, faults and other geological structures,and it has complex formation lithology, the surrounding rock types.It is a typical Long Tunnel.The specific work is as follows on the base of the investigation on geological and hydrogeological conditions of Xuefengshan Tunnel No.1:(1) To master the relationship of groundwater changes and tunnel construction water gushing through the analysis of the observational data and the study on the characteristics and types of groundwater occurrence combined with groundwater recharge and runoff.(2) Influence tunnel of hydraulic radius is divided into five independent hydrogeological section and hydrogeological conceptual model is established.(3) Generalizate a mathematical model on the base of conceptualization,and use Visual MODFLOW to establish the three-dimensional numerical model of the hydrogeology section for the simulation of tunnel excavation seepage field through the discretization of the aquifer systems and handling of hydrogeological parameters and boundary conditions.(4)Use the simulation results to predict the tunnel area of water gushing, and regular gushing forecasting methods were analyzed to enhance the predictive accuracy.And finally propose preventive measures to be taken in the construction of tunnel construction and operation of the process to reduce gushing water caused by a variety of hazards.更多还原