惠州地下水封油库三维非恒定渗流场研究

水封地下油库渗流场的分布是油库区地下水管理和油库运行方案的基本依据之一。为了解惠州水封地下油库区地下水在施工期和运行期的变化情况,应用三维非恒定流数值方法对复杂水文条件下的洞库区渗流场进行模拟,分析了不同初始地下水位条件对洞库区围岩渗流场的影响,探讨了施工期水幕系统不注水条件对油库运行的影响。研究表明:储油主洞开挖期间,水幕系统不注水将导致洞库围岩出现大范围的非饱和区,从而影响洞库多品种油品的储存。运行期水幕注水时的水封效果良好,洞库区围岩在进行灌浆处理后的涌水量较小。

3D Non-steady seepage Simulation of Huizhou Water Sealed Underground Caverns for Oil Storage

Distribution of seepage field of water sealed underground caverns is one of the foundation for underground water management and operation plan of oil underground storage engineering.To better understand the variation of ground water in the site of Huizhou water sealed underground caverns during construction period and operation time,a three dimension non-steady numerical method is employed to simulate the seepage filed of caverns area in complicated hydrology condition.The influence of initial water table on seepage field distribution is analyzed and consequence of no water injection of water curtain system during construction of main caverns for oil storage is discussed.It indicates that the unsaturated area around the caverns due to excavation during construction period will occur and it may influence the storage of different type of oil due to connective unsaturated area.The water sealed effect is good under the condition of water injection of water curtain system.The discharge flow in the caverns for oil storage is small after the surrounding rock mass grouted.