Abstract
The constantly increasing loads of vehicles predetermine the search for ways to improve both design methods, technological processes and the search for ways to improve the quality of road construction materials. The increasing volumes of open-pit coal mining require finding ways to improve the haul roads of open-pit coal mines. Thus, a qualitatively new approach is needed to determine the strength performance of coarse-grained media. In this work, it is proposed to determine the strength performance of granular media by the oblique shear method, since today there is no design method to determine the strength performance of coarse-grained media. The proposed design of the advanced oblique shear apparatus makes it possible to determine the strength performance of pre-compacted coarse-grained media with a particle size of up to 20-30 mm. To avoid the effect of keyways and chaotic results, the optimum clearance between the upper and the lower holders should be 0.3 times the maximum particle size.
Highlights
One of the most important operations in open-pit mining is rock mass hauling, which is carried out, in the vast majority of cases, by dump trucks
The strength performance of coarse-grained media have not been studied enough to be predictable or used as reference or normative data. This is due, among other things, to the fact that, despite a fairly large number of existing methods, including the direct shear, the triaxial compression and the field loading test according to the State Standard GOST 12248-2010, the rotational shear and the shear of ground pillars according to the State Standard GOST 20276-2012, as well as the oblique shear according to the IndustrySpecific Construction Standard VSN 29-76, only the last two methods can be used for coarse-grained media
If granular medium is used as a material for the construction of mine haul road pavements, it must be compacted, which makes it possible to achieve a density exceeding the density under in-place conditions, which is simulated using these apparatuses
Summary
One of the most important operations in open-pit mining is rock mass hauling, which is carried out, in the vast majority of cases, by dump trucks. To reduce the unit cost of mining, including at the expense of hauling costs, industrial enterprises tend to use dump trucks of especially large carrying capacity, up to 500 tons This cannot but affect the state of open pit roads, which are built mainly from granular media: crushed rocks, crushed stone, crushed stone-sand and gravel-sand mixtures. If granular medium is used as a material for the construction of mine haul road pavements, it must be compacted, which makes it possible to achieve a density exceeding the density under in-place conditions, which is simulated using these apparatuses In this case, all known methods become inapplicable due to the fact that they do not provide the required degree of compaction during preparation for the experiment. It is known that the mechanical properties of soils depend on their physical parameters, including density (porosity, void ratio) [5-8, etc.]
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