Thank you, my friends. Your suggestions will be helpful. I think you have confirmed my previous conclusion that there are no readily available detailed guidelines for what I call "passive anchors", generally grouted bars in rock or soil used to support a wall or prevent hydrostatic uplift of a slab or mat. My understanding is that soil nails reinforce a soil mass by tying the soil in front to the soil behind and also support a lightly-loaded facing. Rock bolts generally join blocks of rock together to form a stable mass. I think I can borrow from both those technologies plus post-tensioned anchors.
Our detail often is a bar grouted into a 4" or 6" hole in rock, occasionally soil, with a plate or hook at the top cast into the concrete structure. I am sure we have some that are well over 50 years old, and I have never heard of a failure. Lately we have been using epoxy-coated bars. I recently saw a design by another firm that had bars grouted in corrugated encasement similar to Class I post-tensioned anchor design. I am curious about the wide range between passive anchors protected only by grout and concrete versus PT anchors with "double corrosion protection". Lately we have been requiring pre-construction testing and learned that some of our rocks eg, marl, don't fit into PTI's list of expected ultimate bond strengths.
I would welcome more discussion.