【摘要】 结合汕头地下水封式LPG储库的修建,研究储气库的水压密封原理及LPG洞储的气密条件,并通过渗流场的三维数值模拟,得出储气库周围的压力水头及水力梯度的分布规律,验证气密性条件和设置人工水幕的必要性。由于洞库是裸洞储气,且埋深大、跨度大,因此进行了洞室稳定性的三维数值分析,同时优化施工方案,确保施工及运营过程洞室的稳定性。介绍注浆和水幕钻孔技术,这是地下水封式LPG储库修建的两项关键技术,良好的注浆效果可以减少开挖期间的渗漏水、有利于保持必要的水位线、有利于封闭裂隙而减少气体逃逸,水幕钻孔是运营期间水幕保持良好工作状态的保证。汕头地下水封式LPG储库的修建技术对今后我国地下水封式储气库的设计、施工都有一定的参考价值。更多还原

【Abstract】 Based on the construction of the underground water-seal LPG storage in Shantou,water-seal principle and the associated condition of airproof are studied in this paper.Three-dimensional numerical seepage analysis is carried out for LPG underground storage,to validate the necessity of airproof condition and manual water curtain,and to obtain the distributions of water pressure and hydraulic gradient around the LPG storage.Because the storage is unlined,deeply buried and has a large span,a three-dimensional stability analysis is also conducted.The construction scheme is optimized to ensure the stability of the storage.Two important techniques,grouting and water-curtain drilling,are introduced.The grouting method can reduce water seepage during construction,also keep the water at an adequate level.The end result is to seal fractures,thus prevent any air outflow.On the other hand,use of the water-curtain drilling method can ensure a good water-curtain condition during operation.更多还原