MSE Wall Repair
MSE Wall Repair
(OP)
Looking for any viable options to repair an aging MSE wall (20+ years old) with severe corrosion of the internal strapping. Someone suggested drilled soil nails with a shotcrete face as an option. The wall has a wire mesh facing and is about 20 m high. The wall will have to overcome large surcharge loads (400 ton) from mining trucks as they back onto it. Trying to find an alternative to completely replacing it.





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http://www.soilnaillauncher.com/
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There is no reason to shotcrete the facing unless you have corrosion issues on the facing. If you plate the heads of the nails and put them in at about 5' centers you can span between the nails with the facing you already have.
RE: MSE Wall Repair
f-d
¡papá gordo ain't no madre flaca!
RE: MSE Wall Repair
The pilaster and tie back system is interesting, what would be a good reference in order to see what the system looks like. Are the pilasters tied to each other somehow? How wide are the pilasters in general? The wall is 13m high (update from original post) and 100 m long.
RE: MSE Wall Repair
The first thing we did was assume that the safety factor was unity (we had signs of failure). We then calculated what supplemental buttress would be needed (on a unit foot basis) to increase the safety factor to 1.5 (understanding the mode of failure and the concern on global, internal and external failures). We then considered the spacing of the pilaster (i.e., 8 ft) and determined the lateral load that would act on the pilaster. At that point it's a structural beam that's vertical, if you get my point. You have to consider bending moments, point reactions (i.e., at the tieback) and structual reinforcement. Each pilaster has a footing to support the weight of the pilaster and also the vertical contribution from the battered tie-back.
We used cast-in-place construction. We ruled out pre-cast construction as the intimate contact between the pilaster and the wall would still require some grouting or such.
f-d
¡papá gordo ain't no madre flaca!
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How the soil in between the pilasters is supported (what mechanism hold it up)?
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Thank you for the information.
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Arching.
f-d
¡papá gordo ain't no madre flaca!
RE: MSE Wall Repair