Since only 7 throwers made the mark, the next five furthest-throwing athletes also advanced to meet the minimum 12 in the final.
Gorchakova set a new world record, besting the old one by more than 2.5 metres.
Ozolina also had a good round, besting the old Olympic record to come in second in qualification.
The top six throwers after those three received three more attempts, taking their best result of the six.
No one came close to equalling Gorchakova's qualifying round throw, her own attempts in the final not coming within 5 metres of it as she dropped to third place.