In order to investigate the stability of salt caverns in long term operation, three different shapes of salt cavern models were analyzed with respect to the stress distribution of cavern wall and volume change of cavern under various running pressures. The simulation results showed that stress on the wall is at the highest level in the initial operation period of the cavem storage, and stress concentration occurs mainly in parts with higher curvature on the cavity wall. The stress relaxation is also noticeable under fluctuating operation pressure, and the stress in different parts becomes evenly distribution along the cavern wall with stress gradually declining. There is no obvious fluctuation in changing of cavern stress and cavern volume when the operation pressure varies from 4 to 14.5 Mpa annually. After a time span often years simulation, volumes of pear-shaped cavern, ellipsoid-shaped cavern and cone-shaped cavem reduces 27%, 22% and 37% respectively, and the decrease rate of cavem volume becomes smaller and smaller.%为考察盐穴储气库长期运行的稳定性,对3种不同形态的盐穴储气库模型在变化的运行压力下从腔壁应力分布及溶腔体积变化两方面进行分析.研究表明:盐穴腔体投入运行的初期是腔壁应力水平最高的时期,应力集中主要出现在腔壁曲率较大的部分；在变化的内压之下,应力松弛现象同样明显,腔壁应力在逐渐降低的同时,各部位的应力水平趋于均匀；在4～14.5 MPa的运行压力下,溶腔应力变化及体积变化未随运行压力变化出现明显波动；模拟10年的运行之后,梨形、近似球形和圆锥形储气库的体积将分别缩小27％、22％和37％,体积缩减速度在不断趋于平缓.
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