Hard Rock Drilling
Definition - What does Hard Rock Drilling mean?
Hard rock drilling describes the process of trenchless construction through metamorphic rocks with consolidated crystalline structures. Drilling equipment must be designed to overcome the compressive strength of the rock. Drill bits with conical tooth profiles have proven to be effective and most popular when confronted with a hard rock drilling project.
Trenchlesspedia explains Hard Rock Drilling
The type of rock to be encountered during a trenchless construction is determined through geological surveys. Granite, Basalt and Quartz are some examples of hard rock that can be encountered during trenchless drilling. Difficulties encountered when drilling through hard rock include contingencies for extended time due to slow drilling rates and also the wear and tear on equipment.
There tends to be a higher failure rate of drilling strings etc. when placed under the continuous pressure of hard rock drilling. Choosing the best drill bit is one of the most critical success factors. Other techniques can also be effective for cutting through hard rock, like air hammers and mud motors.