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tolerance for lean of retaining wall
hi, i am involved in an investigation regarding a leaning retaining wall. i am trying to write a report and am wondering if anyone knows offhand a code based tolerance for angle of lean (ie. what is/is not acceptable), especially in a canadian context.
thanks

i think this is not a code issue, rather an engineering investigation (on original design and strength of the retaining wall)in conjuction with geotechnical analysis is required.
thre is no acceptablility criteria for lean of a retaining wall that i know of.
i don't know how much the wall needs to actually move to achive the active pressure, but if it is cantilevered retaining wall, it is supposed to move....... again, i don't know how much.
it is not an issue of forward movement for the development of active vs passive pressure or anything like that.
the wall is actually rotating or falling over due to the pressure of the soil behind it. its very obvious to the naked eye; we had it surveyed and its about 8 degrees off a vertical reference line. in other words, an overturning failure. i suspect it was backfilled with the local clay instead of a granular fill.
i was assuming that there must be some kind of tolerance that i could compare it to in my report as even a "properly" designed and constructed retaining wall would be resonably be expected to lean a little bit either backwards or forwards.
thanks
then find out what the angle is for development of active pressure for a typical soil and use that.
i cannot remember an actual maximum deflection criteria for retaining walls. perhaps there should be. but 8 degrees is certainly unacceptable. is this a cantilever wall or a gravity wall? if cantilevered, the failure could be either rotation or stem failure.
retaining walls backfilled with clay are very complicated things. if the clay shrinks and swells with moisture change, cracks will collect debris, changing the volume. where you are the cracks will also collect water and freeze. thus the movement is often gradual (creep) and can continue to move for years.

2009-09-16, 03:00 PM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	olerance for lean of retaining wall tolerance for lean of retaining wall hi, i am involved in an investigation regarding a leaning retaining wall. i am trying to write a report and am wondering if anyone knows offhand a code based tolerance for angle of lean (ie. what is/is not acceptable), especially in a canadian context. thanks i think this is not a code issue, rather an engineering investigation (on original design and strength of the retaining wall)in conjuction with geotechnical analysis is required. thre is no acceptablility criteria for lean of a retaining wall that i know of. i don't know how much the wall needs to actually move to achive the active pressure, but if it is cantilevered retaining wall, it is supposed to move....... again, i don't know how much. it is not an issue of forward movement for the development of active vs passive pressure or anything like that. the wall is actually rotating or falling over due to the pressure of the soil behind it. its very obvious to the naked eye; we had it surveyed and its about 8 degrees off a vertical reference line. in other words, an overturning failure. i suspect it was backfilled with the local clay instead of a granular fill. i was assuming that there must be some kind of tolerance that i could compare it to in my report as even a "properly" designed and constructed retaining wall would be resonably be expected to lean a little bit either backwards or forwards. thanks then find out what the angle is for development of active pressure for a typical soil and use that. i cannot remember an actual maximum deflection criteria for retaining walls. perhaps there should be. but 8 degrees is certainly unacceptable. is this a cantilever wall or a gravity wall? if cantilevered, the failure could be either rotation or stem failure. retaining walls backfilled with clay are very complicated things. if the clay shrinks and swells with moisture change, cracks will collect debris, changing the volume. where you are the cracks will also collect water and freeze. thus the movement is often gradual (creep) and can continue to move for years. __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]