Typification of the Mining Technological Complexes at the Quarries

Computer-aided design of rational parameters for the location of blasthole charges in horizontal underground development

“…The timing between the rows of blasthole (borehole) charges initiations is determined by the time of separation of the previous layer from the massif and is determined by the dependence: where u is the average movement velocity of the front of the gap formed between the boreholes in the given row. According to the calculations given in Rakishev (2016), it lies in the range of 10–15 m/s.…”

“…The most successful scheme of the explosion of G. I. Pokrovsky, which has received experimental confirmation and has become a classic, is considered below (Pokrovsky and Fedorov 1957) to determine the most significant of those factors. It was further developed in the works of B. R. Rakishev (1983, 2016).…”

“…Using general theorems of theoretical mechanics, regularities and provisions of the theory of elasticity (Adushkin and Sukhotin 1961; Rodionov and Adushkin 1971; Hanukaev 1974; Stanyukovich 1975; Nikiforovsky and Shemyakin 1979; Rakishev and Rakisheva 2011) in Rakishev (1983, 2016) for the relative limiting radius of the blast cavity (see Figure 1(a)) – the main criterion for the effect of an explosion in a solid rock mass – the following equation was derived: where is the initial pressure of the EPs in the charging chamber (MPa) and is the strength characteristics of rocks under conditions of all-round explosive loading (MPa).…”

“…The condition under which the complete coverage of the broken layer of rocks by cracks formed by the action of the explosion of explosive charges is ensured is the principle of rational placement in the exploded mass. In the case of well benching of benches, it is expressed by the equalities (Rakishev 1983, 2016): where is the coefficient taking into account the fraction of destruction of the rock mass both from the action of reflected waves and the swelling action of the explosion and ; is the line of resistance along the bottom of the ledge (LLR) (m); is the distance between wells in a row (m); is the height of the cylindrical charge in the well without overdrilling (m); is the height of the blasted block (m).…”

Analysis of the Modern Development of Mining and Processing Complexes in Uzbekistan

“…This provision requires an urgent revaluation of the specified field on a systematic, integrated basis, which will allow to clarify the scale of the field's industrial reserves (according to preliminary consolidated calculations, it should increase approximately 2-3 times) and optimize its conditions and boundaries, as well as the order and pace of reserves development [5].…”