As mining advances and undergoes operational changes, it is crucial to re-evaluate modes of slope failure potential. In addition to continually ensuring the integrity of the final highwall, this re-evaluation will also reduce the likelihood of instability and rockfall hazards.
Further optimization such as steepening slope angles, increasing bench heights, or even reducing bench widths can provide significant economic benefits and protect the life of an operation. Some realized gains include improved access to ore, minimization of waste rock removal without sacrificing overall stability, and enhanced safety in challenging geologic conditions.
GeoStabilization can improve the overall integrity of pit slope and combat planes of weakness such as joints, faults, mud seams, intersecting voids and changes in face orientation against an unfavorable geological structure. Additional benefits include stabilizing bench and ramp access or relieving pore pressure within the rock mass.
Specific applications include:
Previously GeoStabilization has provided Value Engineering (VE), design-build proposals that focus on the dominant planar surfaces incorporating a rock bolt pattern. Deeper anchor depths are allocated here to penetrate the dominant discontinuity and designed to optimize anchor load capacities.
To expedite a stabilization project, GeoStabilization incorporated limited access wagon drills with a helicopter to mobilize our compressor and drills to the working bench. A safety scale was completed ahead of installing 60 grouted anchors.
Surface water runoff from the upper benches eroded the slope’s center portion and undercut a lower bench slope. The resulting washout ripped through the geofabric and sliced through the slope. GeoStabilization erected a structure to divert the water away from this critical mud cell and prevent further erosion. This action preserved this crucial area of the mine.
GeoStabilization installed a rockfall protection barrier system at the base of the steep slope and constructed of a soil nail wall ahead of the decline ramp tunnels.
A variation of karst sinkhole grouting is the grouting of mined coal seams and workings located below existing infrastructure that exhibit the potential to propagate to the surface and cause sinkholes and/or subsidence.