Lead squeezed out from cast iron pipe joint

[pe123]

I'm investigating the failure of a cast iron bell and spigot water main with lead and oakum joints. Pipe settlement caused joint rotation resulting in a bell fracture. Has anyone observed lead squeezed or pushed out of this type of joint or analyzed lead squeeze mechanics including creep versus time?

 

[rconner]

If you have not yet read the thread at

http://www.eng-tips.com/viewthread.cfm?qid=167007&page=1,

you may perhaps be helped by it or linked references.