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山洞式地下油库由于具有防火、防爆、减少油料蒸发、安全储油等优点而越来越受到人们的重视。然而山洞式地下油库罐室的渗漏水防治也是急待解决的问题。在油库罐室的开挖过程中,由于爆破松动使围岩初始应力消失,岩石自然应力平衡状态遭到破坏后,将向新的平衡状态转化。同时岩石节理更加发育,山体局部地区裂隙水流向和流量将发生变化,并通过岩石节理裂隙渗漏出来,导致油库罐室大面积渗水。如若在罐室开挖中遇到山体水系发育,后果更为严重。山洞式地下油库主要以钢油罐贮油为主,油罐钢板厚度一般在8毫米以下,输油管线及机械设备均为钢铁制品。钢板和钢铁制品的锈蚀除了与内在组成结构有密切关系外,相对湿度是影响腐蚀的最重要因素。相对湿度促进钢铁生锈的比值见表1。
Cave-type underground oil depots have received more and more attention due to their advantages of fire prevention, explosion-proof, reduction of oil evaporation, and safe oil storage. However, the prevention of seepage water in cavernous underground oil tanks is also an urgent problem to be solved. During the excavation of the oil tank tank room, the initial stress of the surrounding rock will disappear due to the loosening of the blasting, and the natural equilibrium state of the rock will be destroyed and the new equilibrium will be transformed. At the same time, the rock joints are more developed, and the flow and flow of the fissure water in some areas of the mountain will change and leak through rock joints and cracks, leading to a large area of seepage in the tank room. If the development of the mountain water system is encountered during the excavation of the tank, the consequences are even more serious. Cave-type underground oil depots are mainly based on oil storage tanks for steel tanks. The tank plate thickness is generally less than 8 mm. The pipelines and mechanical equipment are all steel products. Corrosion of steel plates and steel products, in addition to being closely related to the internal composition, is the most important factor affecting corrosion. The ratio of relative humidity to steel rust is shown in Table 1.