"掏槽深度" can be translated as "cutting depth" or "slotting depth" in English, depending on the specific context within the field of engineering or mining.
"Cutting depth" is a more general term that can be used in various contexts where material is being removed or cut.
"Slotting depth" is more specific to the process of creating slots or grooves, which might be more appropriate in certain mining or engineering operations where slots are cut into materials.
In the context of mining or tunneling, where "掏槽" often refers to the initial excavation to create a free face for subsequent blasting or excavation, "cutting depth" might be the more commonly used term. However, the exact translation may vary slightly depending on the specific industry and usage.