Rock bursting and splitting
Rock bursting and splitting
Rock bursting and splitting is a controlled method of breaking rock into smaller pieces without using explosives. It is commonly used in construction, demolition, excavation, quarrying, and civil infrastructure projects where vibration, noise, or safety concerns make blasting unsuitable.
Rock Splitting
Rock Splitting
Rock splitting involves:
- Drilling a series of holes into the rock.
- Inserting hydraulic splitters or expansive grout into the holes.
- Applying pressure that causes the rock to crack along predetermined lines.
This method provides precise control over where the rock breaks.
Rock Bursting
The term “rock bursting” in construction and demolition often refers to breaking rock by generating extremely high pressure within drilled holes, causing the rock to fracture and “burst” apart. This can be achieved using:
- Hydraulic bursting equipment
- Expansive chemical agents (non-explosive demolition grout)
- Pneumatic splitting systems
Advantages
- Minimal vibration compared to blasting
- Lower noise levels
- Suitable near buildings, roads, railways, and utilities
- Improved safety in urban environments
- Reduced risk of damage to surrounding structures
Common applications
- Basement and foundation excavations
- Road and rail construction
- Trenching for services
- Tunnel construction
- Quarry operations
- Removal of large rock outcrops
- Demolition projects where blasting is prohibited
Example
If a developer encounters a large sandstone formation while excavating for a basement in Sydney, they may drill holes into the rock and use hydraulic splitters or expansive grout to fracture it into manageable pieces without affecting nearby buildings.
This technique is widely used in urban areas where traditional explosives would be impractical, unsafe, or restricted by regulations.
