Comprehensive guide on the use and types of rock bolts in tunneling, mining, and civil engineering.
Rock bolts are high-strength steel threaded rods inserted into rock or soil to stabilize underground structures during excavation. These bolts create a prestressed anchorage system that transfers the load from unstable rock layers to stable strata, enhancing structural safety and stability. As a key component in geotechnical engineering, rock bolts play a crucial role in supporting tunnels, mines, retaining walls, and slopes.
The Self-Drilling Anchor (SDA) system combines drilling and grouting into a single process, ideal for loose or collapsing soil. It reduces installation time and ensures reliable anchorage even in weak ground conditions.
These consist of a steel tube with an expansion shell that anchors itself by creating compressive pressure within the rock. The expansion mechanism ensures strong mechanical interlock with the surrounding rock surface.
Resin-grouted rock anchors are used in fractured or weak rock conditions. The resin provides a strong bond between the bolt and rock, offering excellent resistance against pull-out or shear failure. Commonly used in mining, tunneling, and slope stabilization.
Swellex rock bolts expand hydraulically once inserted, adapting to irregular rock surfaces. They provide immediate support and are ideal for unstable or shifting ground conditions such as underground mines or tunnels.
Made from steel bars threaded on both ends, these bolts are anchored with nuts and plates. They are suited for hard rock formations requiring high tensile support in mining and civil projects.