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Abstract The existence of indissolvable muddy intercalation leads to many adverse effects for building salt cavern storages by solution mining. It is an urgent technical problem that how to forecast and control the collapse of indissolvable intercalation. Taking the problem as research background，the laws of tensile strength weakening of intercalation samples soaked in different brine concentrations are studied. The test results show that the lower of brine concentration is or the longer of soaked time is，the more obvious the weakening degree will be；the two factors，namely solution of salt and water-uptake soften of clay mineral，promote each other during weakening process. The test results also show that the weakening laws are not the same among samples with different salt content rates. Soaked in brine whose concentration is close to field brine concentration，the tensile strength of muddy intercalation samples with low salt content rate are weakened lightly and slowly；the samples with middle salt content rates are weakened obviously when soaked in middle concentration brine，and the solution of salt grains and water-uptake of clay mineral play a controlling role in weakening of intercalation；soaked in unsaturated brine，the samples with high salt content rate are weakened quickly，and the primary reason is the damage of framework caused by solution of salt grains.
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Received: 27 March 2009
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