Joint orientation and spacing has a profound influence on blasting design, wall control and stabilization. Joint mapping is essential for accurate rock quality designations and features prominently in most rock mass classifications.
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WipJointwill indicate the pre-blast in situ block size from the jointing pattern data that is evident on the rock face. Contractors involved in tunneling will find this valuable in documenting ground conditions encountered as the tunnel proceeds. WipJoint can provide a permanent data and image record for archival purposes. Quarry operators will be able to pre-determine the “blastability of material” based on jointing data and assess the damage caused by previous blasting and pre-shear efforts on the highwall.
Mine planners, blasters and design engineers will be able to adjust patterns based on jointing characteristics to minimize overbreak and reduce underbreak resulting in more competent support and safer openings.
In tunneling and underground mining changing rock conditions play an important part in the overall design and subsequent support of the openings that are created in the rock. Frequently ground conditions will change throughout the course of a project and compensating steps must be taken to remain within budget and preserve the structural integrity of the openings. If these steps are not taken heavily jointed formations may be “overblasted” with subsequent overbreak and damage to walls. This may necessitate remedial measures in the form of anchors and shotcreate which is costly.
WipJoint allows you to document the jointing patterns encountered. It also defines the orientation and spacing of the joints and from this predicts the blastability of the rock. Armed with this information contractors can adjust drill patterns and wall control methods to compensate for the changing conditions.
Often cost disputes arise after the fact when contractors submit billing that exceeds the estimates. If unresolved this can lead to litigation. WipJoint then becomes an invaluable record of the conditions encountered and can be introduced as evidence to support claims.
WipJoint users will be able to assess the comminution factor which is the mean block size based on jointing before the blast divided by the mean block size measured after the blast. This factor can be used to predict fragmentation based on jointing data for future shots and blast models can be adjusted to produce more accurate results.