B717 FLT CREW TAXIES OFF THE PAVEMENT ONTO THE GRASS WHILE ATTEMPTING TO TURN AT RIC.

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WX AT IAD RESULTED IN HOLDING AT MOL FOR APPROX 30 MINS. COORDINATED WITH SOC. BINGO AT 7000 LBS AND RIC DIVERT FIELD. FBO X WAS TO HANDLE THE ACFT UPON ARR. WE LANDED ON RWY 20 AND EXITED AT U1 AND STOPPED THE ACFT ON U1. WE ASKED THE TWR FOR DIRECTIONS TO FBO X. WE WERE INSTRUCTED TO TURN L ON TXWY K. AFTER TAXIING ON TXWY K UP TO A 90 DEG R TURN; WE CAME TO A FULL STOP AGAIN AND ASKED THE TWR FOR FURTHER DIRECTIONS (GO STRAIGHT OR TURN R). WE WERE INSTRUCTED TO TURN R AND GO TO THE END TO FBO X. I INITIATED THE R TURN; FOCUSING ON REMAINING CLR OF THE OUTSIDE BOUNDARY OF THE TXWY; ONTO WHICH I WAS TURNING. ABOUT 20 DEGS INTO THE TURN; IT BECAME APPARENT TO MYSELF AND MY FO THAT THE MAINS WOULD NOT CLR AND I ATTEMPTED TO RE-STRAIGHTEN THE NOSE GEAR BACK TO THE L TO STRAIGHTEN BACK ONTO THE ORIGINAL TXWY. SIMULTANEOUSLY; THE R MAINS DEPARTED THE TXWY ONTO THE GRASS. I COULD NOT GET THE NOSE TO STRAIGHTEN AND IT CONTINUED THE TURN (AROUND THE R MAIN) ABOUT ANOTHER 20 DEGS; THEN CAME TO A REST. THE ACFT WOULD NOT MOVE UNDER NORMAL TAXI PWR. I ELECTED TO CALL FBO X FOR HELP. THEY BROUGHT A TUG; BUT WERE UNSUCCESSFUL IN PULLING US ONTO THE TXWY. FBO X AND THE CRASH CREW ON SCENE (CRASH CREW WAS NOT CALLED BY ME OR MY FO). IT WAS RECOMMENDED AT THAT TIME BY THE 'ON SCENE LEADER' FOR US TO ATTEMPT TO PWR OUT. WE WERE ASSURED THE PATH WAS CLR TO THE TXWY. APPROX PWR REQUIRED WAS EQUIVALENT TO A XBLEED ENG START. ONCE THE ACFT BEGAN TO MOVE; IT ROLLED EASILY ONTO THE TXWY. WE WERE INSTRUCTED AT THIS TIME TO GO TO FBO Y FOR HANDLING. TAXI TO NEW FBO WAS UNEVENTFUL. THE WHOLE AREA SURROUNDING TXWY K IS VERY POORLY LIT AT NIGHT; MAKING DETERMINATION OF THE WIDTH OF THE TXWY DIFFICULT. THE ARPT CHART SHOWED US AS LEGAL TO TAXI ON TXWY K. SUPPLEMENTAL INFO FROM ACN 599566: I CHKED TAXI CHART AND LOOKED UP AND NOTICED THAT THE ACFT WOULD NOT MAKE PRESENT TURN AND REMAIN ON TXWY. AT THE SAME TIME I CALLED 'STOP' GOING OFF THE TXWY. I GOT ON THE BRAKES AND ATTEMPTED TO STOP THE ACFT.