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地下水封洞库渗流场分析和渗水量预测是水幕系统水封效果评价的核心内容,目前多采用连续等效模型进行这类大范围的渗流场分析,分析结果是否可靠的关键在于能否合理、可靠地获取裂隙岩体的等效渗透参数。施工期进行了大量的与水幕孔有关的现场水力学试验,可以用于分析和确定岩体等效渗透参数,但试验的理论背景、试验过程的合理性和数据分析方法还有待深入研究。首先简要介绍了黄岛石油储备洞库工程的4种水幕孔现场水力学试验的试验过程和特点;然后,采用三维渗流数值分析方法,研究了施工期因水幕廊道排水作用对水幕孔围岩渗流场的影响。基于施工期水幕孔注水试验,在达西流假定下,建立了围岩等效渗透系数与水幕孔注水量的经验关系,由此,可以根据水幕孔注水量反算出围岩等效渗透系数。采用裂隙-孔隙渗流分析模型,对比解释了裂隙不同发育特征对水幕孔注水量及岩体宏观渗透参数的影响。最后,对实测试验资料进行了分析,获得了水幕系统围岩等效渗透系数分区图。研究结果对水幕孔有关的渗透性试验的理论分析、裂隙岩体渗透参数取值研究等具有参考价值。
The seepage field analysis and water seepage prediction of groundwater sealed caverns are the core contents of water curtain sealing effectiveness evaluation. At present, continuous equivalent model is used to analyze such large-scale seepage field. Whether the result is reliable or not is reasonable , And obtain the equivalent penetration parameters of fractured rock mass reliably. During the construction period, a large number of on-site hydraulics experiments related to water curtain were conducted, which can be used to analyze and determine the equivalent permeability parameters of rock mass. However, the theoretical background of the experiment, the rationality of the test process and the data analysis methods have yet to be further studied. First of all, the experimental process and characteristics of four on-site hydraulic tests of water curtain in Huangdao Oil Storage Cave Project are briefly introduced. Then the numerical simulation method of three-dimensional seepage is used to study the influence of water curtain on water curtain Influence of Seepage Field of Hole Surrounding Rocks. Based on the test of water curtain water injection during construction period, the empirical relationship between the equivalent permeability coefficient of surrounding rock and the water injection volume of water curtain was established under the assumptions of Darcy flow. Thus, the equivalent of surrounding rock can be calculated according to the water injection quantity of water curtain Permeability coefficient. By using the fracture-pore seepage analysis model, the influence of different developmental features of fracture on water curtain water injection and macro-permeability parameters of rock mass is explained. Finally, the experimental data were analyzed and the partition diagram of equivalent permeability coefficient of surrounding rock of water curtain system was obtained. The results of the theoretical analysis of the water curtain permeability test, fractured rock mass permeability parameters such as a reference value.