The dynamic compressive strength (DCS) of frozen-thawed rock influences the stability mass in cold regions, especially when masses are possibly disturbed by loads. Laboratory freeze-thaw weathering treatment is usually time-consuming, and test destructive. Therefore, this paper attempts to quickly predict DCS sandstones using data-driven methods, non-destructive properties, basic environmental parameters. sparrow search algorithm (SSA), gorilla troops optimiser, dung beetle optimiser were...

Abstract Empirical relationships for estimating Uniaxial Compressive Strength (UCS) of rock from other properties are numerous in literature. This is because the laboratory procedure determination UCS compression tests cumbersome, time consuming, and often considered expensive, especially small to medium-sized mining engineering projects. However, these empirical models scattered literature, making it difficult access a considerable number them when there need select model estimation UCS....

Effects of strain rate on specific fracture energy and micro-fracture surface properties rock specimen were investigated at rates ∼ 60–115.0 s-1. To achieve this, breakage was conducted under dynamic uniaxial compression using the split Hopkinson's pressure bar. The area fine fragments (<8*10-3m) measured gas absorption method while large (>8*10-3m) close-range photogrammetry. Results reveal that generally increase with during compression. Similarly, total broken also increased dissipated...

Based on the data of global mineral production and ore recovery in mining processing, this paper presents annual 25 minerals calculates losses 20 from year 1920 to 2018. The results indicate that 23 has increased by between 1 930 times since 1920, similar increase GDP per capita 1960. At same time, a vast amount been lost processing 1920. Hence, discusses possibility increasing ratio.

Abstract Rock properties are important for design of surface and underground mines as well civil engineering projects. Among rock is the characteristic impedance rock. Characteristic plays a crucial role in solving problems shock waves mining engineering. The characteristics has been related with other literature. However, regression models between literature do not consider variabilities their characterizations. Therefore, this study proposed two soft computing [i.e., artificial neural...

Abstract The strength of rock has significant influence on its performance, and is, therefore, a key input during modelling analysis mining geotechnical engineering structures. uniaxial compressive (UCS), which is popular parameter to quantifying can be determined in the laboratory using suggested method by International Society Rock Mechanics (ISRM). However, determination UCS consumes time, it costly, sometimes may not feasible perform because different conditions rock. Hence, this study...

Abstract Mineral resources are estimated to establish potential orebody with acceptable quality (grade) and quantity (tonnage) validate investment. Estimating mineral is associated uncertainty from sampling, geological heterogeneity, shortage of knowledge application mathematical models at sampled unsampled locations. The causes overestimation or underestimation deposit and/or quantity, affecting the anticipated value a mining project. Therefore, assessed avoid any likely risks, areas more...

Abstract In this study, the application of characteristic impedance in estimating specific energy and average fragment size rocks was investigated during rock breakage at high strain rates. To achieve this, specimen prepared accordance with recommendations International Society for Rock Mechanics broken rates using split Hopkinson’s pressure bar system. Results reveal that although rate is well related to rocks, product more reliable forementioned parameters. addition, dissipated generally...

To solve the safe containment and recovery efficiencies of gas in rock masses, a study on fracture process zone (FPZ) crack propagation is conducted. By using digital image correlation technology, displacement three-point bending specimens was measured. analyzing distributions at different loading stages, specific region between pre-crack tip point divided into three zones: intact zone, FPZ. The length migration velocity FPZ were determined, also microstructures investigated through optical...

The stratigraphy of the Sokoto Basin has Illo/Gundumi Formation at bottom, followed successively upward by Taloka, Dukamaje, Wurno, Dange, Kalambaina, Gamba and GwanduFormations. Re-mapping basin carried out in this studyshows that geological framework remainslargely as previously outlined except some hitherto unreported tectonically controlled structures have been documented. is generally shallower margin deepens towards centre such areas around border with Niger Republic are deepest hence...

Abstract Deformation modulus of rock mass (Em) is an important parameter for the analysis and design mining engineering projects. However, field tests measuring deformation are difficult, time-consuming, capital intensive. This has led to development numerous empirical models estimating modulus, which in different forms scattered literature. The available literature use types inputs. Therefore, this study provides a comprehensive compilation masses. compiled grouped based on their type input...

Following limited earth resources and increasing toxic effluents from utilization of nonrenewable energies in comminution processes, effects ore-loss energy wastage on earth's sustainability cannot be overemphasized. The aim this study therefore is to investigate the role characteristic impedance (product sonic wave velocity density) classifying visually similar rocks with widely varying breakage properties as a strategy for reducing ore loss consumed producing unwanted fragment sizes. To...

ABSTRACT: In this study, relations between characteristic impedance (product of sonic wave velocity and density), energy transformation dynamic stress induced faults in rock specimen were investigated. To achieve this, peridotite pyroxenite from Boliden Kevitsa mine Sodankylä, Finland was prepared to length diameter ratio 1:1 accordance with recommendations the International Society for Rock Mechanics (ISRM) tests. This followed by measurement under cyclic until breakage occurred. Results...

ABSTRACT: Rock slope design comprises systematic evaluation of geological, geotechnical, and engineering parameters affecting safety stability slopes in rockmass. However, it is common to have several possibilities for a single In the forementioned instance, reliability-based (RBD) could provide insights on most feasible this generally involves computational runs each design. study, combined Monte Carlo simulation (MCS) sample reweighting method was explored with aim obtaining rock during...

The stratigraphy of the Sokoto Basin has Illo/Gundumi Formation at bottom, followed successively upward by Taloka, Dukamaje, Wurno, Dange, Kalambaina, Gamba and Gwandu Formations. Re-mapping basin carried out in this study shows that geological framework remains largely as previously outlined except some hitherto unreported tectonically controlled structures have been documented. is generally shallower margin deepens towards centre such areas around border with Niger Republic are deepest...

Abstract Dynamic properties of rocks are essential for planning sustainable engineering structures in regions prone to dynamic loading as well effective fragment size distributions during quarrying activities. Due the vast application rock properties, several studies have been conducted on context. However, relations between dissipated energy and compressive strength scanty. The aim study is investigate fragmentation Kemi-peridotites at high strain rates. To achieve this, cored specimen was...

Summary The Bida and the Sokoto Basins are two of Nigeria's inland basins that constitute another set a series Cretaceous later rift in Central West Africa whose origin is related to opening South Atlantic. Geophysical aeromagnetic interpretation has assisted geology basins. Organic geochemical studies show Kudu Shale Northern Basin equivalent Ahoko Southern Dukamaje Formation (dark shales limestones) source rocks potential petroleum system. With averages for rock thickness 40m, area basin...

Summary The Bida and Sokoto Basins are two of Nigeria's inland basins that constitute another set a series Cretaceous later rift in Central West Africa whose origin is related to the opening South Atlantic. Geophysical aeromagnetic interpretation has assisted geology basins. Organic geochemical studies show Kudu Shale Northern Basin equivalent Ahoko Southern Dukamaje Formation (dark shales limestones) source rocks potential petroleum system. With averages for rock thickness 40m, area basin...

Summary Preliminary assessment of the structural controls Nigerian sector Iullemmeden Basin, northwestern Nigeria has been carried out using non-evasive techniques. The Sokoto Basin deepens towards Niger Republic. Depth to basement interpretations from aeromagnetic data show eight major depressions in basin comprising Yerimawa-SabonBirni-Isah trough, Wurno-Rabah trench, Sokoto-Bodinga-Tambulwa Tureta-Bakura ditches, Lema-Tambo sinks, Koko-Giro Gada holes and Kiwon Allah-Sokwoi-Illela pits....