I need to build a tall ( about 1.5m) retaining wall. The soil is very stony and compacted and the upper surfaces used only by foot traffic.
I'm planning a 500mm wide trench for foundations. Then a course of concrete blocks on their sides to form a wall 200mmm thick.
This will be faced by a dry stone wall also 200mm thick possibly with the backs of the stones set in mortar.
My questions are:- Is this generally a sound idea? How deep should the foundations be?