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地下水封石油洞库是利用饱水岩体密封性进行石油储存的方式。在地下水封石油洞库的建设中,由于工程体的出现,改变了区域地下水的补给、径流和排泄条件,干扰了原来平衡的地下水渗流场,为保证地下石油洞库的水封效果,需进行裂隙岩体渗透特性及地下水渗流场时空演化研究。以国内首个在建的大型地下水封石油储库为工程背景,结合现场试验数据分析,运用等效连续介质的方法,采用裂隙岩体各向异性渗透张量,建立三维地下水数值模拟模型,预测不同施工进程时地下水位的变化。分析预测结果表明:在地下洞室开挖过程中,无水幕条件下地下水位逐渐降低,主洞室部分区域出现零水头压力区,无法保证水封性;模拟运营期水幕巷道施加定水压力,地下水位上升至设计高度35 m且趋于稳定,可以满足水封效果要求。研究结果对地下石油洞库的水封性评价具有一定的工程意义和理论价值。
Groundwater sealed oil reservoir is the use of saturated rock sealing oil storage methods. In the construction of groundwater sealed petroleum coffers, due to the appearance of engineering bodies, the groundwater recharge, runoff and drainage conditions in the area have been changed, disturbing the originally balanced groundwater seepage field. In order to ensure the water seal effect of underground petroleum coffers, Study on Permeability of Fractured Rock Mass and Spatio - Temporal Evolution of Groundwater Seepage Field. Taking the first large-scale groundwater sealed oil reservoir under construction as an engineering background, a three-dimensional numerical simulation model of groundwater was established based on the field test data and the equivalent continuum method using the anisotropic seepage tensor of fractured rock mass. Changes of groundwater level during different construction processes. The results of analysis and prediction show that underground water level gradually decreases in the underground tunnel excavation process and zero head pressure zone occurs in some areas of the main tunnel, which can not guarantee the water-tightness. In the simulated operation period, Pressure, groundwater level rose to a design height of 35 m and stabilized, to meet the water seal effect requirements. The research results have certain engineering significance and theoretical value for the evaluation of water seal of underground petroleum caverns.