高渗压条件下基于非达西流的裂隙岩体渗透特性研究

发布时间：2018-05-29 07:46

本文选题：岩石力学 + 渗透特性　；参考：《岩石力学与工程学报》2014年09期

【摘要】：钻孔高压压水试验是评估高水头条件下岩体渗透特性的主要手段。目前,高水压条件下岩体的渗透特性估算多借鉴基于Darcy流假定的钻孔常规压水试验行业规程推荐公式,尚缺乏成熟、有效的计算方法。基于非线性Izbash定律,建立高渗压条件下岩体渗透系数的估算公式,并将高压压水试验P-Q曲线分为线性段、非线性段和水力劈裂扩展段。提出的公式应用简便,各压水试验段岩体渗透系数的确定只需稳态下的流量和水头,并且表征水流流态的系数m可通过曲线拟合得到。通过对琼中抽水蓄能电站高岔区钻孔高压压水试验数据的研究表明,岩体的渗透特性不受水流流态的影响,在高压压水试验的线性段和非线性段基本保持一致;岩体发生水力劈裂后,岩体的渗透特性将急剧增大。建立的公式可为高渗压条件下岩体的渗透特性取值提供一种有效的途径。
[Abstract]:Borehole high pressure water pressure test is the main method to evaluate the permeability characteristics of rock mass under high water head condition. At present, the estimation of the permeability characteristics of rock mass under high water pressure condition is usually based on the recommended formula of conventional drilling water pressure test industry rules based on Darcy flow assumption, and there is still a lack of mature and effective calculation method. Based on the nonlinear Izbash law, a formula for estimating the permeability coefficient of rock mass under high permeability pressure is established. The P-Q curve of high pressure water pressure test is divided into linear section, nonlinear section and hydraulic fracturing extension section. The formula is simple and convenient to be applied. The determination of rock mass permeability coefficient only needs steady flow rate and water head, and the coefficient m, which characterizes the flow state of water flow, can be obtained by curve fitting. The study on the experimental data of high pressure water pressure of boreholes in the high turnout area of Qiongzhong pumped Storage Power Station shows that the permeability characteristics of rock mass are not affected by the water flow state and are basically consistent in the linear and nonlinear sections of the high pressure water pressure test. When hydraulic fracturing occurs in rock mass, the permeability characteristics of rock mass will increase rapidly. The established formula can provide an effective way to determine the permeability characteristics of rock mass under the condition of high permeability pressure.
【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;
【基金】：国家重点基础研究发展计划(973)项目(2011CB013503) 国家优秀青年科学基金项目(51222903) 国家自然科学基金面上项目(51179136)
【分类号】：TU452

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