... ABSTRACT: Blocks of rock are large fragments of the bedrock that have not suffered a strong erosive process and have remained in the soil horizons. They can be oval shaped, or nearly spherical. The calculation for blasting is different, as the volume between these blocks varies, and so does...

... of their components (fragments and matrix) and the matrix ratio (the percentage of matrix in a given volume). INTRODUCTION Common rock mass classification systems (Q, RMR, SMR) are mostly applicable to hard rocks and do not fully apply for the characterization of weak materials (Kanji, 2014; Zhai et al., 2017...

.... Moreover, inter-granular fractures mainly occur under quasi-static compressive conditions, and the failure mode becomes trans-granular when the strain rate is high. Specimens with lower grain content exhibited fewer fractures and larger fragments than those with higher grain content. Considering...

... and fault gouges). The rock texture found in the core zones is made of fragments that follow a fractal size distribution from the microscale to, occasionally, hundreds of meters in length (Billi et al., 2003). Fault zones typically exhibit substantial heterogeneity since they comprise intact, unaltered...

... Abstract The safe geometrical configuration of the mine overburden dumps largely depends on the size distribution of the fragmented rock and its shear resistence characteristics. The aggregate mixture of fragmented rock and loose soil developed interlocking effect thereby strengthening...

... of the segments and abandoning of the tunnel (Gong et al. 2016). As a result, advance time of tunnel boring machine (TBM) and project costs would be increased. Thus, necessary measures must be taken to precondition the boulders before TBM excavation. Drilling and blasting from the ground to fragment the boulders...

... trajectory algorithm axis mining science apparatus rock mechanic international journal calculation tracking fragment rotation resolution fragmentation frag 50 fragment trajectory viewpoint development giacomini Abstract In this paper, an apparatus to track rock fragment...

... rockburst reservoir characterization journal amplitude reservoir geomechanics sandstone specimen numerical simulation wellbore design hydraulic fracturing simulation fdem rockburst simulation energy characteristic confinement characteristic rock mechanic fragment munjiza...

... and the compactness of the rocks (Aktinson, 1993; Fiorentini, 2002; Back, 2015). rio grande sul fragment federal resistance deposit santa maria specification granulation reservoir characterization degradation mineral porto alegre departamento nacional ground transportation aggregate...

...FRACTAL FEATURE RESEARCH ON IMPACT FRAGMENTS OF COALMINE DEEP ROCK *Qi Ping, Qinyong Ma, Pu Yuan, and Xiaozhu Chen Ministry of Education s Engineering Research Center of Mine Underground Projects, Anhui University of Science and Technology No.168, Shungeng Road Huainan, Anhui, P.R. China 232001...

... Abstract During crushing, rock particle is subjected to complicated loading and the particle shape influences the fragmentation outcome. Thus, a highly controlled laboratory test is desired to establish the relation between the loading and the fragmentation parameters for better understanding...

... and Li (1997) found linguoid, river-shaped and rhizome-shaped fractures on the surface of rockburst fragments and observed that the transcrystalline cracks was the main crack style. He et al. (2010) showed that more transcrystalline cracks were generated in granite rockburst as compared with the uniaxial...

... energy to act upon the rockmass for the fragmentation and muck displacement. It is also shown that better explosive energy utilization put lesser pressure on loading-hauling equipment which can reduce carbon footprints for the mining. Subject: rock breakage and excavation techniques Keywords: blasting...

... Gesteinbruch - - - .~ INTRODUCTION , I In most enng practices, or na~r~ dis~ters, rocks are uSUallyfractured at high loading rates, i.e, dynamic (stress wave) lOading. So far ,most of the research concerning the dynamic fracture and fragmentation of rock has been basically limited to the influences...

.... Reservoir Characterization strength limit shear resistance shear resistance wellbore integrity roughness experiment zertsalov Upstream Oil & Gas resistance evaluation inclination rock mass asperity graph Wellbore Design calculation deformability analysis jointed rock mass fragment...

... ABSTRACT: Calculating the tension deformed state of the rocks based on the quantity minimizing of the fragments full potential energy, which is consisted of the final elements describing the researched object is given here. RESUME: On propose la methode de minimisation locale de l'etat-tendu...

... Upstream Oil & Gas scale effect correlation main result fragment cutting spherical indenter index test mechanical property reservoir geomechanics strength Rock mechanics diameter size sample Reservoir Characterization rock fragment dimension rock strength epoxy resin...

...Analysis of rock fragmentation in bench blasting using digital image processing Untersuchung der Felszersplitterung durch Sprengung mittels digitaler Bildverarbeitung Analyse de fragmentation de roche avant et apres I'abattage utilisant Ie traitement digital d'image IAN W. FARMER, I.w. Farmer...

... "fragment" remained largely intact, allowing good observation of the rock surfaces. ' , J 2 ,GEOLOGY AND MINING GEOMETRY. Finsch Diamond Mine commenced mining by open pit methods. These operations were completed recently, with the pit at a maximum depth of 430m. During the progress of the open pit mining...

... ABSTRACT: Laboratory scale bench blasting experiments were run in instrumented concrete models up to 1 m 3 in size to study the fracture and fragmentation mechanisms. Eight single-hole and two time-delayed two-hole tests were conducted. High speed photographs of the tests were analysed...