Abstract
In this article, a model of ore deposit in form of a lense carried out in the MineScape program, is presented. The lense had a thickness of 30 m, length along the strike 200 m, and the depth buried was for 80 m to 110 m below the surface. In the first layer, counting from the lowest level, a room and pillar method with variable geometry was designed. The width and length dimensions for rooms and pillars were: 4 m, 5 m and 6 m, respectively. For the selected part of the deposit, three variants of the system with variable geometry of rooms and pillars were designed, for which the deposit utilization coefficient was determined. The next stage of the research was to determine the influence of the geometry of the pillars and rooms on the range of the rock destruction zone around room excavations. For this purpose, numerical calculations using the three-dimensional Examine 3D program, based on the boundary element method, were made. The results of numerical tests were used to calculate the load of the rock bolt support, which is currently used in the zinc and lead underground mine “Olkusz-Pomorzany” in Poland. Currently in the mine, the bolt spacing is 1 m × 1 m, and the technology for fixing the bolt rod is based on resin cartridges that completely fill the bolt hole. In order to spread the spacing of the rock bolt support and to apply segmental fixing of the bolt rod, in the laboratory tests, rock bolt supports with increased strength were tested. Based on the results obtained, it was found that the rock bolt can be installed segmentally, using a cement grout, and its spacing can be increased to 2 m.
Highlights
Contemporary underground mining of mineral resources is increasingly associated with geological and mining software packages
In order to spread the spacing of the rock bolt support and to apply segmental fixing of the bolt rod, in the laboratory tests, rock bolt supports with increased strength were tested
The obtained results of laboratory tests of the tensile SAS 650/800 rock bolt support allows us to state, that for the support equipped with a flat washer and one nut, the weakest construction point is the inlet to the spiro steel pin (Figure 15a)
Summary
Contemporary underground mining of mineral resources is increasingly associated with geological and mining software packages. Computer-aided design (CAD) programs support the work of engineers from the point of exploration of the deposit, determination of the size of its resources, mineral quality, geological, hydrogeological, tectonic conditions, through planning of access and cutting of the deposit. The process of planning and scheduling exploitation requires the combination of a large amount of diverse data, geological, operational or economic, which is the basis for most of the available computer-aided design programs. At present, when designing underground operations, calculations for operational losses, and the deposit utilization factor [2], are separately performed. The relationship between room and pillar geometry is known as a deposit utilization factor
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
