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Abstract The influences of geometrical parameters，surrounding rock parameters and the height of casing shoe under various geological conditions on the stability，impermeability and serviceability of the underground gas storage in salt rock were studied based on the numerical simulation. And then the optimization criteria of design parameters for underground gas storage under various geological conditions were presented. In salt domes and thick salt layers，central expansion cylindrical cavity should be adopted in order to minimize the damage of the salt rock. In the same geological conditions，the top expansion cylindrical cavity should be adopted in order to decrease the cavity shrinkage and ground settlement. And in thin salt layers the best shape to ensure the stability of cavity was ellipsoid with the axial ratio of 7/3. The reasonable pillar spacing in the salt dome and thick salt layers should exceed three times of the chamber diameter，and two times in thin salt layer. The minimum thickness of roof should ensure salt cavity did not leak，collapse and the ground did not subside heavily under the maximum allowable internal pressure. The top of the casing shoe should be located outside the allowable influence range of salt creep in order to make sure the impermeability of the cavity.
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Received: 15 February 2011
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2011, Vol. 30 
