An analysis of the impact of the water curtain system on the safety of an underground water-sealed cavern
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摘要: 为了解水幕系统对地下水封洞库的储藏安全的作用，验证水幕系统设置的必要性，基于多相流理论，依托烟台某地下水封洞库工程，以其丙烷子洞库为例，分别设计无水平水幕系统、设置单一水平水幕系统和设置水平与垂直双水幕系统三种工况形式，选用TOUGH2软件中TMVOC模块，进行藏品水-油-气三相流运移模拟。模拟结果显示：丙烷在储藏过程中会逐步形成围绕在洞室周边的污染晕，且污染晕的水平延伸较为显著。相邻洞室间污染晕随着时间的推移相互贯通。在无水幕系统的工况下，藏品在储藏9个月内，污染晕水平迁移距离便达到风险阈值，其余工况下，污染晕在藏品储藏100年后仍未达到风险阈值，并圈闭在一定范围内。在垂直水幕的作用下，污染晕的水平迁移受到明显抑制。因此，仅依赖天然地下水补给，藏品极易发生泄露，带来安全隐患，为保证地下水封洞库的储藏安全，设置水幕系统是必要且有效的。Abstract: In order to understand the role of the water curtain system in the storage security of underground cavern, and verify the necessity of setting up the water curtain system, on the basis of an underground water-sealed cavern in Yantai, several simulating conditions are designed, including a no-water curtain system, a single horizontal water curtain system and a horizontal and vertical water curtain system, using the TMVOC module of TOUGH2 software to simulate the three-phase flow of gas, oil and water with multiphase flow theory. The results of numerical simulations indicate that the pollution halos will form round the caverns, in which the horizontal extension is more obvious. As time goes on, the pollution halos between the adjacent caverns pass through each other. Without the water curtain system, the horizontal migration extension of the pollution halos reaches the risk threshold in 9 months. While under the other simulating conditions, the pollution halos have not reached the risk threshold after 100 years of storage, all of which are trapped in a certain range. Besides, the vertical curtain system can markedly inhibit the horizontal migration of the pollution halos. In conclusion, we note that the propane in the cavern leaks easily depending only on the natural groundwater recharge. It is necessary and effective to set the water curtain system to constrain migration of pollution halos and ensure the storage safety of the underground water-sealed cavern.
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