The migration processes of gasoline and Liquefied Petroleum Gas (LPG) in tank pond for underground storage tank leak at different zones in some urban gas station were simulated by the three-dimensional multiphase mixture flow model. The gasoline and LPG (vapor phase and liquid phase) saturation? Velocity, hazardous concentration and temperature fields were visualized. The flow development and the effect of influencing factors on infiltration flow were analyzed. Their characteristics of infiltration diffusion were analyzed comparatively. The simulation results show that gasoline infiltration diffusion is slower greatly than LPG in the same conditions of leak hole and underground environment! When gasoline leak accident happens, underground environment will be mainly influenced; when LPG leak accident happens, not only underground environment but also atmosphere environment will be influenced ; gravity is thekey factor to gasoline infiltration diffusion and there is only Darcy flow during gasoline infiltration; the gravity is a main factor to LPG liquid phase infiltration; the direction of LPG vapor infiltration diffusion is controlled comprehensibly by gravity, leak velocity direction, the position of outlet and the tank wall shape; the position of outlet is the key factor to LPG vapor infiltration direction.%利用多相混合数值模拟模型对加油加气站常用石油燃料(汽油、液化石油气)地下储罐不同位置发生泄漏事故在罐池中渗流扩散过程进行模拟,得到汽油、液化石油气(LPG)气相和液相饱和度、危险浓度区域、流速等空间分布规律以及流动趋势变化,并对影响汽油、LPG流动的主要因素进行分析,对比讨论其泄漏渗流扩散的特点.模拟结果表明:在泄漏口周围地下环境条件相同情况下,地下储罐泄漏时汽油渗流扩散比液化石油气渗流扩散缓慢；汽油地下储罐泄漏主要对地下环境造成污染,液化石油气对地下环境造成污染而且给外界环境带来火灾爆炸危险；汽油渗流速度低,整个流场只存在层流,渗流扩散方向主要受重力影响.LPG液相泄漏受重力影响尤为明显；LPG气体渗流扩散方向受出口位置、泄漏速度方向、重力、储罐罐壁形状影响；出口位置是控制气体渗流方向关键因素.
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