PLTS OF AN EX-MIL SEL JET; ALLOWED ACFT TO SETTLE BACK ONTO RWY DURING TKOF CAUSING NOSE GEAR TO BE JAMMED IN THE UP POS AND CONTINUED WITH TKOF FOR EVENTUAL NOSE GEAR UP LNDG.

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TKOF FROM CTB 14900 LBS; 77 DEG F; RWY 23; WIND CALM. NORMAL ACCELERATION AND FULL PWR FROM ENG. ROTATED IN GND EFFECT 110 PLUS KTS; GEAR RETRACTED -- ACFT SETTLED TO RWY IN SPITE OF ATTEMPTS TO CTL THIS WITH ELEVATOR. ACFT CONTACTED RWY LEVEL SLID OFF AT END OF RWY 20-30 FT IN GRASS. CONTACTED RWY LIGHTS; BECAME AIRBORNE AGAIN AS GND RAPIDLY DROPPED AWAY TO A DEEP VALLEY. GAINED FLYING SPD; GEAR WAS UP; FLAPS IN TKOF 31 DEG POS. PLANE SANK INTO VALLEY; ATTAINED CLB AND FLYING SPD. CLBED TO 13000-14000 FT; ASSESSED DAMAGE. RADIO CONTACT BY HAND HELD ONLY; FLAPS FUNCTIONAL; GEAR CYCLED DOWN; NOSE GEAR TRAPPED. FLEW OVER ARPT; NOSE GEAR RPTED UP. EXHAUSTED FUEL; LANDED ON MAIN GEAR ONLY; HELD NOSE OFF; SLID TO STOP CTR OF RWY WITHOUT INCIDENT OR INJURY. THIS INCIDENT COULD HAVE BEEN AVOIDED. THE PLANE WAS HEAVILY LOADED; DENSITY ALT 5100 FT. I FEEL I SHOULD HAVE OBTAINED A HIGHER AIRSPD UNDER THESE CONDITIONS AND WAITED LONGER BEFORE RETRACTING LNDG GEAR. THE PLANE WAS CAPABLE OF FLYING OFF OF THIS ARPT AT THIS TEMP. I BELIEVE MY TECHNIQUE WAS AT FAULT.