They will escape I suspect but it will be far less work dealing with that than trying to 'fix' it. Just don't let any shoots pop up where you don't want them; rhizome prune (both inside & outside the barrier) if it makes you more comfortable with the situation.
Brad Salmon, zone 5b/6 Southern Indiana
Winters -20 to -25C. Summers 30 to 35C , humid. 115 cm annual precipitation, frost free from May through early October. 259.3 meters elevation. Growing 150+ species. http://www.needmorebamboo.com/