Limestone can be a bit tricky as it may have voids. Be careful.
Suggest you consider post tensioned anchors. DSI (Dywidag) have an excellent system, and as the bars can be spliced easily, and protected from corrosion with their system, should be usable. You may have to have a wall that is thin...
Cornerstone is at risistone.com, and Allan Block is at allanblock.com
They do provide computer programs for their products; but these can be a bit difficult to operate. If used, they should be verified by independent calculations. I have seen reports and design procedures from geotextile...
The active pressure is when the wall is allowed to move - agreed; but then in long term retaining walls the soil consolidates and the pressure builds. For walls with a life of less than 1 year (shoring for excavations that will be backfilled), the active pressure can be used. Longer durations...
