PA34 ON TRAINING FLIGHT INITIATES GAR WITH LNDG GEAR NOT DOWN AND BOTH PROPS STRIKE RWY.

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WHILE CONDUCTING A NIGHT FLT FOR A COMMERCIAL LESSON WITH MY STUDENT WE WERE PERFORMING STOP AND GOES ON RWY 30R AT ZZZ. MY STUDENT WAS CONDUCTING THE FLT AS 'ACTING PIC' PER THE COMMERCIAL PART 142 TRAINING SYLLABUS FOR LESSON 42. WHILE DOING A SIMULATED SINGLE-ENG LNDG ON RWY 30R MY STUDENT WAS ON SHORT FINAL AND I NOTICED THAT HE HAD NOT YET EXTENDED HIS LNDG GEAR. I HESITATED TO SEE IF THE GEAR WARNING HORN WOULD SOUND WHEN HE SET 25 DEGS OF FLAPS; BUT IT DID NOT. I INSTRUCTED HIM TO 'GAR;' BUT NO ACTION WAS TAKEN. I TOOK CTLS AND ADDED FULL PWR; BUT WE WERE TOO CLOSE TO THE RWY AND I COULD NOT STOP THE SINK RATE. BOTH PROPS BRIEFLY STRUCK THE RWY BEFORE THE ACFT GAINED SOME ALT WHERE I EXTENDED THE GEAR AND LANDED ON AVAILABLE RWY. I THEN PROCEEDED TO TAXI BACK TO COMPANY RAMP WITHOUT FURTHER INCIDENT. I UNDERSTAND THAT THIS COULD HAVE BEEN EASILY AVOIDED BY MANY MEANS. THIS WAS A LATE FLT AFTER BEING UP ALL DAY AND I WAS DEFINITELY NOT PAYING CLOSE ENOUGH ATTN. THIS INCIDENT COULD BE AVOIDED BY FUTURE STUDENTS AND INSTRUCTORS BY GIVING YOURSELF GOOD STANDARDS TO FLY BY. GIVING THE NATURE OF ADVANCED TRAINING WE HAVE MORE TRUST FOR OUR DEVELOPING STUDENTS; SO IT IS POSSIBLE TO BECOME LAX IN OUR TRAINING. THIS SHOULD NOT HAPPEN. HAD I GIVEN MYSELF A PERSONAL MINIMUM OF CALLING THE GAR NO LOWER THAN 300-400 FT THIS WOULD NOT HAVE HAPPENED. ALSO; I BELIEVE THAT BETTER AND MORE FREQUENT PRACTICE WITH GAR PROCS SHOULD BE PRACTICED AT ALL SKILL LEVELS. I HOPE THIS LETTER REALLY DOES SOME GOOD FOR ALL PLTS. WHILE I AM A LOW-TIME PLT; I HAVE A GOOD AMOUNT OF EXPERIENCE IN THE ACFT I AM OPERATING. PITFALLS ARE EASY TO FALL INTO.