基于高压压水试验的裂隙岩体非线性渗流参数解析模型

发布时间：2018-03-22 21:12

本文选题：裂隙岩体　切入点：渗透特性　出处：《水利学报》2016年06期 　论文类型：期刊论文

【摘要】：高渗压条件下裂隙岩体的渗透特性是高压引水隧洞近场渗流场分析与工程防渗设计的重要参数,一般通过现场钻孔高压压水试验获得。针对钻孔高压压水试验流量-压力曲线的非线性特征,建立了基于Forchheimer方程的裂隙岩体非线性渗流参数(渗透系数k和非线性系数b)解析模型。该解析模型中的渗透系数解析表达式与现行钻孔压水试验规程推荐公式一致,不仅形式简洁,而且物理意义明确,是现行规程推荐公式在非线性流条件下的拓展,可作为高压压水试验条件下钻孔压水试验规程修订的重要依据。对海南省琼中抽水蓄能电站高压岔管区钻孔高压压水试验成果的分析表明:Forchheimer方程很好地表征了高压压水试验过程中流量-压力曲线的非线性特征,本文提出的解析模型为高渗压条件下裂隙岩体非线性渗流参数的合理取值提供了有效的方法和手段,克服了现行钻孔压水试验规程对高渗压条件下裂隙岩体渗透性难以正确表征的局限和由此带来的工程防渗设计风险。
[Abstract]:The permeability characteristic of fractured rock mass under high permeability pressure is an important parameter of near field seepage field analysis and engineering impervious design of high pressure diversion tunnel. Generally, it is obtained through the field borehole high pressure water pressure test. According to the nonlinear characteristics of the flow-pressure curve of the borehole high pressure water pressure test, The analytical model of nonlinear seepage parameters (permeability coefficient k and nonlinear coefficient b) of fractured rock mass based on Forchheimer equation is established. Not only the form is simple, but also the physical meaning is clear. It is an extension of the recommended formula of the current regulations under the condition of nonlinear flow. It can be used as an important basis for the revision of drilling pressure water test rules under the condition of high pressure water pressure test. The analysis of the results of borehole high pressure water pressure test in Qiongzhong pumped Storage Power Station of Hainan Province shows that the high level is well characterized by the 1% Forchheimer equation. The nonlinear characteristics of flow-pressure curve in pressure-pressure-water test, The analytical model proposed in this paper provides an effective method and means for the rational selection of nonlinear seepage parameters of fractured rock mass under high permeability pressure. It overcomes the limitation of the current borehole water pressure test code which is difficult to accurately characterize the permeability of fractured rock mass under the condition of high permeability pressure and the engineering impervious design risk brought about therefrom.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;武汉理工大学资源与环境工程学院;
【基金】：国家自然科学基金项目(51222903,51179136,51579188) 国家重点基础研究发展计划(973)项目(2011CB013503)
【分类号】：TV223.4

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