Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Lapčević Veljko"'
Sensitivity analysis of rock mass parameters estimate influence on decline support design using NATM
Publikováno v:
Podzemni Radovi, Vol 2019, Iss 34, Pp 27-41 (2019)
Capital mine development is often faced with limited geotechnical databases and designers are faced with more or less accurate estimates of missing parameters. GSI classification if often used with numerical modelling and its rounding unit is ±5 as
Externí odkaz:
https://doaj.org/article/1008c67088a548779a8fbf81b5d913ac
Publikováno v:
Podzemni Radovi, Vol 2019, Iss 35, Pp 49-55 (2019)
Development operation in underground mining require high performance drilling and blasting. In order to determine best performing cut in Lece mine series of experiments were conducted. It was noticed that sequencing of initiation has crucial impact o
Externí odkaz:
https://doaj.org/article/cca4ca185f0741909f882e26dbd8ce12
Autor:
Torbica Slavko, Lapčević Veljko
Publikováno v:
Podzemni Radovi, Vol 2019, Iss 35, Pp 13-21 (2019)
Available models for estimation of crustal stress consider the vertical stress component as weight of above laying rocks, while horizontal stress components are estimated as function of vertical component. Herein, it is assumed that horizontal stress
Externí odkaz:
https://doaj.org/article/311694bb9746419393f901e7cd68fd70
Autor:
Duranović Miodrag, Đokić Nemanja, Lapčević Veljko, Torbica Slavko, Petrović Milenko, Savić Ljiljana
Publikováno v:
Podzemni Radovi, Vol 2018, Iss 33, Pp 61-68 (2018)
Important parameters that describe successful sublevel stoping operation are optimal fragmentation and low damage of rock mass around stopes. In current state of operation fragmentation of blasted material is not optimal since high percentage of frag
Externí odkaz:
https://doaj.org/article/71ad3c22f15b4e94adb4b80a3f5a5214
Autor:
Torbica Slavko, Lapčević Veljko
Publikováno v:
Podzemni Radovi, Vol 2018, Iss 32, Pp 15-31 (2018)
Optimizing blast fragmentation and reducing the damage from it are two important research subjects in this field. Detonation and explosive charge induces three sets of tension cracks in the monolith rock. Radial tension cracks are formed under the in
Externí odkaz:
https://doaj.org/article/dc85b780dd75405891e939917efb1f53
Autor:
Lapčević Veljko, Torbica Slavko, Asadizadeh Mostafa, Đokić Nemanja, Duranović Miodrag, Petrović Milenko
Publikováno v:
Podzemni Radovi, Vol 2018, Iss 33, Pp 1-15 (2018)
Discrete element modelling is common approach for analysis of dynamical processes that include granular materials. Method is commonly applied for the modeling of the gravity flow of the broken rock in caving operations. Herein, comparison of two diff
Externí odkaz:
https://doaj.org/article/ddaf1f1ab69c40aba8487fc27e8248f5
Autor:
Đokić Nemanja, Duranović Miodrag, Lapčević Veljko, Torbica Slavko, Petrović Milenko, Savić Ljubinko
Publikováno v:
Podzemni Radovi, Vol 2018, Iss 33, Pp 31-40 (2018)
It is suggested that 2D finite element method models are used for square pillar stability analysis. Equivalent width of strip pillar that is represented by FE models is determined from tributary area method by introducing equivalence of square and st
Externí odkaz:
https://doaj.org/article/dae1562167564458bd5a093edb4d1989
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Autor:
Torbica Slavko, Lapčević Veljko
Publikováno v:
Mining and Metallurgy Engineering Bor, Vol 2016, Iss 1, Pp 103-114 (2016)
Achieving optimal fragmentation of the blasted rock is common task for mining engineers. During the years many models for fragmentation prediction were developed and are mostly based on empirical relations. While there are theoretical expansions of t
Externí odkaz:
https://doaj.org/article/8e231d39299f4fc797307040996d8a36
Autor:
Torbica Slavko, Lapčević Veljko
Publikováno v:
Podzemni Radovi, Vol 2016, Iss 28, Pp 9-17 (2016)
Stress field or in-situ stress, beside rock mass strength, determines stability or instability of underground openings. It plays key role of every rock engineering project, and has been subject of many researches. There are many theoretical models of
Externí odkaz:
https://doaj.org/article/3f016190bddd43a8a7f328af81d87ecd