弱渗透裂隙介质深埋长隧洞水文地质模型及其涌水量预测研究
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摘要
本文在南水北调西线一期工程水文地质条件专题评价工作的基础上,针对弱渗透裂隙介质深埋条件下隧洞涌水问题,从地下水渗流理论的推导、水文地质模型的建立、计算方法的创新和工程应用几个方面进行了深入探讨。围绕弱渗透深埋裂隙介质进行分析,建立的模型和使用的方法都考虑了工程地质和水文地质要素(物理量)在深埋状态下的地下水渗流特性。通过研究取得了一些有益的成果。
     论文首先简要介绍了渗流理论研究历史和现状,简述目前比较常用的几种水文地质模型的建立、边界条件的假定和模型的求解以及水文地质参数的求取,通过对比分析讨论各个模型的优缺点,对采用裂隙网络随机模拟方法来计算和预测涌水量大小进行探讨。其次,根据现场调查和勘探的第一手资料,详细分析了南水北调引水隧洞区内工程地质和水文地质条件,并分区域进行了涌水量预测和计算。最后,对所得数据进行比较分析,认为通过裂隙网络法计算得到的结果合理。
     通过对研究区水文地质条件的分析,归纳了三种典型的地下水渗流特征,并且在继承前人研究成果的基础上,将人工双层水位理论引入到分析和解决深埋条件下引水隧洞涌水量问题,对涌水发生机制以及在不同渗透性条件下指导隧洞开挖具有较好的现实意义。
     将所建立的水流模型和使用的方法应用到南水北调西线一期工程涌水量预测和计算中,取得了满意的结果,证实该方法具有实用性。
This article based on the northward rerouting of southern river west line issue of hydrogeological conditions topic appraisal project, studied the tunnel which deeply buried under the condition of the weak seepage crevasse medium by the ground water movement rule, mainly from the hydrology geology model established, the ground water transfusion theory inferentially, the computational method innovation and the project application etc.to make the thorough discussion, each part of contents all threaded up the weakly seep and deeply buried of the crevasse medium to carry on the analysis, simultaneously the model and the method which established had also considered the engineering geology and the hydrology geologic feature (physical quantity) deeply buried under the condition of the stress strain characteristic, we has yielded some beneficial results through the research..This article first briefly introduced the history of the transfusion fundamental research and the present situation, the summary at present of the several commonly used hydrgeological model establishment, the hypothesis of boundary condition and the model solution and the hydrogeological parameter obtained, discussed each model through the contrast analysis of the good and the bad aspects, attempt to calculate and forecast the water volume size through the crevasse network stochastic simulation method. Second, according to the dam site area original drill holes geological stick plots and the plaint hole element traces multianalysis northward rerouting of southern river derivation tunnel and the dam site area with the horizontal direction engineering geological and the hydrogeological conditions, then divided the region to forecast and computate welled up the water volume. Finally, we took the comparative analysis to the obtained data, proved the view point of this article.Through the various dam sites area drill-log analysis,we had induced three kind of typical ground water transfusios characteristics, and based on the foundation of the predecessors' research results, the artificial double-decked water level theory will introduce to analyze and to solve deeply buried tunnel under the condition of the derivation to well up the water volume question, this method has the better project significance to well up the water mechanism as well as instructs the tunnel under the different permeable condition to excavate.Applying the established fluent model and the method to the northward rerouting of southern river west line issue of project which well up in the water volume forecast and the computation, has obtained the satisfactory results, confirmed that this method will be widely used.
引文
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