I don't know about the B-52 specifically, but it's common design practice to design the strut such that if a turbine engine seizes at high rpm, the strut will fail and allow the engine to depart the airframe (otherwise the stresses could literally break the wing). There was a case back in the 1960s on a 727 where it's suspected that a large chunk of 'blue ice' was ingested by one of the engines, seizing the LP spool - the strut failed as designed and the engine departed the aircraft. Apparently the flight crew had no idea the engine had departed until a rather alarmed passenger alerted a flight attendant that the engine inlet that had previously been obscuring the view out his window was no longer there
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I seem to remember there was a slightly B*tchy saying at the time when there was still potential for competition that the Comet buried its engines in its wing roots while 707 buried them in the countryside.......So it was said Im told
A 707 crashed north of Seattle in 1959 during a pre-delivery test flight - apparently they were testing a new yaw damper and in the process performed such a radical maneuver that three of the four engines departed the aircraft. They were too heavy to make it back to an airport and set it down in Stillaguamish River, killing the four people in the flight deck (four others in the back survived)