Concrete masonry unit (CMU) construction can be or possibly be designed to meet the requirements you may need, however, it will need to be reinforced, with ladder mesh, every or at least every other course, in addition to vertical deformed steel bars (rebar)in filled cells, spaced appropriately. Same vertical bar needs to be tied into the footing horizontal bars or at least doweled into same, when the concrete is placed. In addition to that, to further reinforce, all the cells of the CMU should be filled, might be feasible if just a short knee wall etc. On top of that your choice of CMU and masonry accessories is important, I mean you could go with 75% filled cells high strength block, say 5000 PSI, last I knew, you can't get masonry certifications for CMU any higher than that, your supplier would be best to speak to about what they have, MFR etc. Porosity may also be an issue, depending on the condition of the CMU molds they use, seems ones that have seen a lot of use contribute to this, kind of an FYI on that.
To achieve the same thing concrete will do for you, I believe your labor and possibly material will be more, again I am not talking just plain CMU here, reinforced, quality or higher strength CMU, smaller cells, + accessories for reinforcing and necessary grouting, lastly on that, you do not want to grout but a few courses at a time, we used ready mix trucks, it will blow out a wall just like a poorly braced concrete form.
I would prefer concrete; excavate, form, place rebar, place concrete, finish, provide a keyway for the wall, strip forms, then form the wall, place rebar, place concrete, strip forms and in 28 days you can put a full load on it. Concrete vs masonry might be more consistent compressive strength, depending on how the mortar is mixed. Concrete,it's solid, less permeable, better for water proofing, properly reinforced, will withstand the forces from that bank or similar influence, I would not trust a common CMU wall type against an embankment, it very well may deflect or fail depending on how strong it is built and the forces imposed on it so the wall type design is very important with CMU. I think concrete is still the better choice.
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