Journal articles: 'Rock blasting modelling'

1

Zou, Baoping, Zhipeng Xu, Jianxiu Wang, Zhanyou Luo, and Lisheng Hu. "Numerical Investigation on Influential Factors for Quality of Smooth Blasting in Rock Tunnels." Advances in Civil Engineering 2020 (September 7, 2020): 1–17. http://dx.doi.org/10.1155/2020/9854313.

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The quality of smooth blasting including the volume of over-/underbreak and blasting-induced damage of surrounding rocks has been extensively considered to be highly correlated to both the cost and advancement rate of rock tunnelling excavated by the drill-blast method. A general control strategy for smooth blasting is too difficult to be available due to the uncertainties and complexity of rock masses, as well as the varying blasting operations. As prerequisite for the evaluation of the blasting quality, effective identification of the influential factors affecting smooth blasting usually plays a significant role in the improvement of smooth blasting design. Compared to the expensive and time-consuming experiments including physical modelling and field tests, numerical modelling, as a cost-efficient approach, offers an attractive alternative to investigate the influential factors in terms of weight, which might be more applicable and reliable for the optimization of smooth blasting parameters. In this case, the dominant factors and secondary factors can be quantitatively identified. Considering the dominant factors often orient the development of things; in this work, a numerical-based approach was proposed to quantitatively identify the dominant factors influencing the quality of smooth blasting. Proposed 3-dimensional blasting modelling was based on LS-DYNA to simulate the occurrence of smooth blasting in rock masses, and the erosion algorithm was also employed to determine the fracturing of jointed rocks. The orthogonal experimental design method was utilized to optimize the experimental arrangement. Seven factors with 4 levels including the perimeter hole spacing, line of least resistance, charge concentration, charging explosive, type of rock mass, detonation velocity, and drilling deviation were taken into account. The geological setting and project background of a real rock tunnel served for the Chengdu-Chongqing high-speed railway were selected as the site conditions to perform the numerical investigation. Calculated area and distance of overbreak as the observed parameters indicating the quality of smooth blasting were utilized to determine sensitivities of factors based on the range analysis of orthogonal experiments. The results suggested that the type of rock mass has the greatest influence on the blasting quality, whereas the charge concentration and detonation velocity can be considered as the secondary factors under the specific site conditions. The proposed numerical approach for assessing influential factors of quality of smooth blasting under specified geological conditions is expected to improve the parameter design and operation of smooth blasting in practical applications.

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Zhu, Fan, and Jidong Zhao. "Peridynamic modelling of blasting induced rock fractures." Journal of the Mechanics and Physics of Solids 153 (August 2021): 104469. http://dx.doi.org/10.1016/j.jmps.2021.104469.

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Sainoki, Atsushi, Muhammad Zaka Emad, and Hani S. Mitri. "Study on the efficiency of destress blasting in deep mine drift development." Canadian Geotechnical Journal 54, no. 4 (April 2017): 518–28. http://dx.doi.org/10.1139/cgj-2016-0260.

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Canadian hard rock mines continue to reach deeper deposits, which poses greater challenges to mine safety including rock burst control. Destress blasting techniques have been successfully employed in such underground mines with the aim of preconditioning highly stressed rock mass to mitigate the risk for rock burst occurrence in deep mines. In the present study, the efficiency of destress blasting is examined through a comparison between traditional and alternative numerical modelling approaches. The traditional modelling approach assumes a uniformly distributed blast-induced damage zone extending over the entire drift face, whilst the alternative modelling approach, presented herein, simulates the damage zone for each individual blast hole. In the first part of this paper, a three-dimensional numerical model of a single blast hole is constructed, whereby the extent of blast-induced damage zone is delineated. The latter part of this paper uses the single-hole model results to examine the efficiency of destress blasting as practiced in drift development in deep mines. It is demonstrated through comparison of FLAC3D numerical simulation results that the traditional modelling approach may lead to an overly optimistic indication of destress blasting efficiency when compared with the alternative modelling approach, in which a more precise simulation of the damage zones is applied.

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Tang, B., and H. Mitri. "Numerical modelling of rock preconditioning by destress blasting." Proceedings of the Institution of Civil Engineers - Ground Improvement 5, no. 2 (January 2001): 57–67. http://dx.doi.org/10.1680/grim.2001.5.2.57.

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Tang, B., and H. Mitri. "Numerical modelling of rock preconditioning by destress blasting." Ground Improvement 5, no. 2 (June 2001): 57–67. http://dx.doi.org/10.1680/grim.5.2.57.39983.

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Baranowski, Paweł, Krzysztof Damaziak, Łukasz Mazurkiewicz, Piotr Mertuszka, Witold Pytel, Jerzy Małachowski, Bogumiła Pałac-Walko, and Tristan Jones. "Destress Blasting of Rock Mass: Multiscale Modelling and Simulation." Shock and Vibration 2019 (July 21, 2019): 1–11. http://dx.doi.org/10.1155/2019/2878969.

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In this paper, a multiscale modelling and simulation of destress blasting of rock mass is presented. The proposed and novel approach combines two separate 3D solutions: the first was obtained for the small-scale problem, face(s) blasting process, and the second for the global scale problem, seismic wave propagation within very large volumes of surrounding rock mass. Both the approaches were based on explicit dynamic modelling methodology using the central difference method. In the local case, the arbitrary Lagrangian–Eulerian (ALE) procedure with the Jones–Wilkins–Lee (JWL) equation defining an explosive material was used. For this purpose, a selected volume of a rock mass comprising a blasted mining face was modelled in detail. From the numerical simulation, pressure distribution over the modelled rock was obtained, which was the basis for an initial condition for the global 3D FE model. The peak particle velocity (ppv) distribution obtained from finite element analysis was compared with experimental outcomes. A reasonable agreement between both results was achieved; therefore, the adopted multiscale modelling approach confirmed its effectiveness and that it can be successfully implemented in further engineering practice.

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Saharan, Mani Ram, and Hani S. Mitri. "A Numerical Approach for Simulation of Rock Fracturing in Engineering Blasting." International Journal of Geotechnical Earthquake Engineering 1, no. 2 (July 2010): 38–58. http://dx.doi.org/10.4018/jgee.2010070104.

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An approach for simulation of rock fracturing as a result of engineering blasting is presented in this paper. The approach uses element elimination technique within the framework of finite element method to capture the physics of engineering blasting. The approach does not require pre-placement of fracture paths which is the severe drawback of the other existing methodologies and approaches. Results of plane stress modelling for isotropic brittle rock behaviour are presented in this paper and these results are in good agreement with the existing knowledge base. The authors also review the existing approaches of numerical modelling to compare the efficacy of the element elimination technique. It is anticipated that the further developments with this approach can prove to be good experimental tool to improve engineering blasting operations.

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Baranowski, Paweł, Łukasz Mazurkiewicz, Jerzy Małachowski, and Mateusz Pytlik. "Experimental testing and numerical simulations of blast-induced fracture of dolomite rock." Meccanica 55, no. 12 (August 18, 2020): 2337–52. http://dx.doi.org/10.1007/s11012-020-01223-0.

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AbstractIn this paper, the Johnson-Holmquist II (JH-2) model with parameters for a dolomite rock was used for simulating rock fragmentation. The numerical simulations were followed by experimental tests. Blast holes were drilled in two different samples of the dolomite, and an emulsion high explosive was inserted. The first sample was used to measure acceleration histories, and the cracking pattern was analyzed to perform a detailed study of the blast-induced fracture to validate the proposed method of modelling and to analyze the capability of the JH-2 model for the dolomite. The second sample was used for further validation by scanning the fragments obtained after blasting. The geometries of the fragments were compared with numerical simulations to further validate the proposed method of modelling and the implemented material model. The outcomes are promising, and further study is planned for simulating and optimizing parallel cut-hole blasting.

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Huang, Dan, Xianyang Qiu, Xiuzhi Shi, Yonggang Gou, and Jian Zhou. "Experimental and Numerical Investigation of Blast-Induced Vibration for Short-Delay Cut Blasting in Underground Mining." Shock and Vibration 2019 (August 1, 2019): 1–13. http://dx.doi.org/10.1155/2019/5843516.

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It is essential to control the damage to the surrounding rock and engineering structures in the process of cut blasting with a single free surface in underground mining. To reduce vibration induced by cut blasting, this paper proposes short-delay cut blasting, in which blast holes that are near each other are sequentially initiated with short-delay times. Experimental tests of cut blasting were conducted in a roadway in the Shaxi copper mine to compare the peak particle velocity (PPV) and frequency characteristics of simultaneous blasting and short-delay blasting. Numerical modelling was then developed to study the influence of short-delay times on blast vibration. The accuracy of the numerical simulation was verified by the comparison of the test and simulated data of single-hole blasting. The results show that the amplitude reduction ratio (ARR) value increases gradually with the increase in delay intervals, and the vibration reduction for delay intervals smaller than 6 ms is very limited, particularly in the near field. The principal frequencies (PFs) for short-delay blasting are similar to those for simultaneous blasting, which implies that the frequencies do not increase directly with the decrease of the delay intervals. The experimental tests also show that the mean frequencies (MFs) for the 8 ms delay are slightly higher than those for the 0 ms delay blast. In the case of ensuring the rock breaking of cut blasting, longer delay intervals of 8∼10 ms are beneficial to further reduce PPV in practical blasting.

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Ning, Youjun, Jun Yang, Guowei Ma, and Pengwan Chen. "Modelling Rock Blasting Considering Explosion Gas Penetration Using Discontinuous Deformation Analysis." Rock Mechanics and Rock Engineering 44, no. 4 (January 20, 2011): 483–90. http://dx.doi.org/10.1007/s00603-010-0132-3.

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LI, XUELONG, ZHONGHUI LI, ENYUAN WANG, YUNPEI LIANG, BAOLIN LI, PENG CHEN, and YONGJIE LIU. "PATTERN RECOGNITION OF MINE MICROSEISMIC AND BLASTING EVENTS BASED ON WAVE FRACTAL FEATURES." Fractals 26, no. 03 (June 2018): 1850029. http://dx.doi.org/10.1142/s0218348x18500299.

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A microseismic (MS) monitoring system in a mine can monitor the MS signals generated by coal rock rupture and blasting waves and can distinguish the two types of waves more clearly to monitor and analyze the rupture and evolution process of coal rock. According to the nonlinearity characteristics of the waveform, the fractal characteristics of a mine’s MS and blasting waves are analyzed by simple fractal and multifractal theory, and the simple fractal dimension [Formula: see text] and multifractal parameters are obtained, respectively. Results show that the simple fractal dimension [Formula: see text] reflects the complexity and frequency structure of the wave. The simple fractal dimension [Formula: see text] of a blasting wave is larger than that of a mine MS wave, which indicates that the blasting wave is relatively complex with higher frequency, while the mine MS wave is relatively simple with lower frequency. However, the simple fractal dimension [Formula: see text] can only describe the wave integrity features, not the local features. The multifractal parameters can describe the local characteristics of the wave more finely, and the multifractal spectrum describes the probability information of the singularity exponent [Formula: see text]. The singularity exponential range and multifractal spectral width [Formula: see text] of the blasting wave are smaller than those of the mine MS wave, which indicates that the probability measure of distribution unevenness and the degree of partial parameter fluctuation of the blasting wave are more severe than those of the mine MS wave. Wave signal analysis based on simple fractal and multifractal methods can not only obtain the characteristics of the wave strength and spectral structure but also other important information, such as local singularity. Therefore, it is possible to more clearly and conspicuously identify mine MS and blasting waves, so that coal rock rupture can be monitored more accurately.

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12

Kulynych, Viktoriia, Valerii Chebenko, Ruslan Puzyr, and Iryna Pieieva. "Modelling the influence of gaseous products of explosive detonation on the processes of crack treatment while rock blasting." Mining of Mineral Deposits 15, no. 3 (September 2021): 102–7. http://dx.doi.org/10.33271/mining15.03.102.

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Purpose is mathematical modeling of fracturing as well as influence of gaseous products of explosive detonation on the changes in rock strength. Methods. Mathematical model, using foundations of Griffith theory, has been developed. To explain conditions of bridge formation while exploding lead azide charges, a two-stage description of solid particle condensation at a crack surface and inside it has been applied using the smoothed particle hydrodynamics. The analysis, involved electronic microscope, has helped verified the results experimentally. Findings. The effect of rock mass disturbance, resulting from explosive destruction, is manifested maximally right after the action. Subsequently, it decreases owing to the gradual relaxation of the formed defects. Therefore, an urgent problem is to develop ways slowing down strength restore of the blasted rock mass fragments. The process of rock fragment strength restoring may be prevented by microparticles getting into the microcrack cavities together with the detonation products. The research simulates their action. The data correlate to the simulation results confirming potential influence of the blasted rock on the dynamics of changes in the strength characteristics of the rock mass. Various compositions of charges with shells made of inert solid additions have been applied which solid particles can avoid the process of microcrack closure. Originality. For the first time, the possibility of deposition formation within rock micro- and macrocracks has been proposed and supported mathematically. Practical implications. Strength properties of the finished product and the energy consumption during impulse loading as well as subsequent mechanical processing of nonmetallic building materials depend on the strength properties of rock mass fragments. Hence, the ability to control the strength restore has a great practical value. Moreover, it can be implemented during the blasting operations.

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13

Lou, Xiaoming, Bao Wang, En Wu, Mingwu Sun, Ping Zhou, and Zhenchang Wang. "Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling." Advances in Materials Science and Engineering 2020 (February 18, 2020): 1–13. http://dx.doi.org/10.1155/2020/8568153.

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This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy.

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Kucharczyk, Daniel, Agnieszka Wyłomańska, Jakub Obuchowski, Radosław Zimroz, and Maciej Madziarz. "Stochastic Modelling as a Tool for Seismic Signals Segmentation." Shock and Vibration 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/8453426.

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In order to model nonstationary real-world processes one can find appropriate theoretical model with properties following the analyzed data. However in this case many trajectories of the analyzed process are required. Alternatively, one can extract parts of the signal that have homogenous structure via segmentation. The proper segmentation can lead to extraction of important features of analyzed phenomena that cannot be described without the segmentation. There is no one universal method that can be applied for all of the phenomena; thus novel methods should be invented for specific cases. They might address specific character of the signal in different domains (time, frequency, time-frequency, etc.). In this paper we propose two novel segmentation methods that take under consideration the stochastic properties of the analyzed signals in time domain. Our research is motivated by the analysis of vibration signals acquired in an underground mine. In such signals we observe seismic events which appear after the mining activity, like blasting, provoked relaxation of rock, and some unexpected events, like natural rock burst. The proposed segmentation procedures allow for extraction of such parts of the analyzed signals which are related to mentioned events.

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Yan, Bo, Xinwu Zeng, and Yuan Li. "Subsection Forward Modeling Method of Blasting Stress Wave Underground." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/678468.

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The generation of stress waves induced by explosions underground is governed by material nonlinear responses of materials surrounding explosions and affected by source region mediums and local structures. A nonlinear finite element (NFE) method can simulate the generation efficiently. However, the calculation using the NFE to observational distances, where motions are elastic, is computationally challenging. In order to tackle this problem, we present a subsection numerical simulating method for forward modelling the generation and propagation of stress waves with a hybrid method coupling the NFE and a linear finite element (LFE). The subsection idea is developed based on previous works; calculating steps of the subsection method as well as techniques of passing motions from a source region to an elastic region are discussed. 3D numerical simulations of stress wave propagation in rock generated by decoupled explosion underground with two methods for comparison are carried out. The accuracy of the subsection method is demonstrated with simulated results. The demand of PC memory and the calculating time are investigated. The subsection method provides another approach for modeling and understanding the generation and propagation of explosion-induced stress waves, though, currently, studies are preliminary.

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Rouabhi, A., M. Tijani, P. Moser, and D. Goetz. "Continuum modelling of dynamic behaviour and fragmentation of quasi-brittle materials: application to rock fragmentation by blasting." International Journal for Numerical and Analytical Methods in Geomechanics 29, no. 7 (April 14, 2005): 729–49. http://dx.doi.org/10.1002/nag.436.

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Zhang, Zehua, Wenle Gao, Kunpeng Li, and Baojie Li. "Numerical simulation of rock mass blasting using particle flow code and particle expansion loading algorithm." Simulation Modelling Practice and Theory 104 (November 2020): 102119. http://dx.doi.org/10.1016/j.simpat.2020.102119.

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Nazarenko, Yu B. "The formation of subsurface rock breakdown zones around workings during their driving by drilling and blasting." Journal of Applied Mathematics and Mechanics 56, no. 1 (January 1992): 152–55. http://dx.doi.org/10.1016/0021-8928(92)90110-t.

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Amegbey, N., B. O. Afum, S. Ndur, and E. Coffie-Anum. "Impact Assessment of Atmospheric Pollutants Emissions from Mining Operations at Ghana Managanese Company Ltd." Ghana Mining Journal 16, no. 2 (December 20, 2016): 65–72. http://dx.doi.org/10.4314/gm.v16i2.9.

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Atmospheric pollutants diffusion study was conducted around the operational sites and immediate neighbouring communities of Ghana Manganese Company (GMC). The pollutants are emitted by sources associated with the main operations and activities of the mine including on-bench rock drilling and blasting, material excavation and hauling, vehicular movements and mine machinery exhaust emissions, as well as crushing of blasted rocks. Methodologies involving computerised dispersion modelling was used to estimate near-field ambient pollutant impacts on neighbouring Tarkwa-Banso community, at 400 m from the Mine’s nearest operational site (Pit C North). The community is located in the dispersive fan of North to the East-South-Eastern part of the mine site. Measured airborne particulates (PM10 and TSP) concentrations in the Tarkwa-Banso community were below Ghana EPA’s permissible limits of 70 µg/m3 and 150 µg/m3 respectively. The predicted monthly concentrations of the airborne particulates (PM10 and TSP) at 400 m buffer from the crushing plant were greatly lower than the permissible regulatory limits. With effective dust mitigation measures, the predicted PM10 and TSP dust concentrations emanating from drilling, blasting, loading and hauling activities at Pit C North were also generally lower than the regulatory requirement. All the predicted monthly concentrations of NOx and SO2 at the 400 m buffer from Pit C North were significantly lower than the allowable regulatory requirement of 60 µg/m3 and 100 µg/m3 respectively. The study indicates that, the operation of the crushing plant together with the general mining operations at Pit C North in the mine has no significant impact on Tarkwa-Banso community. Keywords: Impacts, Particulates Matter, Concentration Levels, Environment, Prediction

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Han, Haoyu, Daisuke Fukuda, Hongyuan Liu, Ebrahim Fathi Salmi, Ewan Sellers, Tingjin Liu, and Andrew Chan. "Combined finite-discrete element modelling of rock fracture and fragmentation induced by contour blasting during tunnelling with high horizontal in-situ stress." International Journal of Rock Mechanics and Mining Sciences 127 (March 2020): 104214. http://dx.doi.org/10.1016/j.ijrmms.2020.104214.

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Forquin, Pascal. "Brittle materials at high-loading rates: an open area of research." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 375, no. 2085 (January 28, 2017): 20160436. http://dx.doi.org/10.1098/rsta.2016.0436.

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Brittle materials are extensively used in many civil and military applications involving high-strain-rate loadings such as: blasting or percussive drilling of rocks, ballistic impact against ceramic armour or transparent windshields, plastic explosives used to damage or destroy concrete structures, soft or hard impacts against concrete structures and so on. With all of these applications, brittle materials are subjected to intense loadings characterized by medium to extremely high strain rates (few tens to several tens of thousands per second) leading to extreme and/or specific damage modes such as multiple fragmentation, dynamic cracking, pore collapse, shearing, mode II fracturing and/or microplasticity mechanisms in the material. Additionally, brittle materials exhibit complex features such as a strong strain-rate sensitivity and confining pressure sensitivity that justify expending greater research efforts to understand these complex features. Currently, the most popular dynamic testing techniques used for this are based on the use of split Hopkinson pressure bar methodologies and/or plate-impact testing methods. However, these methods do have some critical limitations and drawbacks when used to investigate the behaviour of brittle materials at high loading rates. The present theme issue of Philosophical Transactions A provides an overview of the latest experimental methods and numerical tools that are currently being developed to investigate the behaviour of brittle materials at high loading rates. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

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"Spherical element bulking mechanisms for modelling blasting induced rock motion." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 29, no. 6 (November 1992): 373. http://dx.doi.org/10.1016/0148-9062(92)91887-b.

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Tuan Nguyen, Anh, Pham VAN HOA, Pham VAN VIET, Tran DINH BAO, and Le THI HAI. "Simulation of FLY-ROCK DISTANCe as a Function of Blast Conditions: a Case Study in Vietnam." Inżynieria Mineralna 1, no. 2 (October 8, 2020). http://dx.doi.org/10.29227/im-2020-02-33.

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The prediction of fly-rock distances is a big problem in the blasting areas of open-pit mines. The fly-rock distance plays a crucial role in the reduction and control of blasting accidents in quarries. This paper proposes the modelling of the contact dynamics as a non-smooth discrete element method (NSCD). Then, the fly-rock phenomenon is simulated using this NSCD method. This approach was to develop a model that correlates to blast conditions, initial fly-rock/rock-fall velocities and permits the computation of fly-rock range from randomization orbits. The results showed that the NSCD method is a good means for the simulation with the variability of blasting parameters. This method is to relate the initial fly-rock velocity to blast conditions and then uses ballistic trajectories to compute the maximum fly-rock distance. Finally, it should be noted that the proposed simulation of fly-rock trajectories which shows the distribution of fly-rock bounce heights above the ground level with the different coefficient of restitution range as a function of blast conditions. It should be used in the Ninh Dan limestone quarry belonging to the Song Thao Cement, Phu Tho province (Vietnam), and it should be directly used in the same other quarries.

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"Optimising blasting operations through rock characterisation and computer modelling-processes in Australia." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 24, no. 6 (December 1987): 245. http://dx.doi.org/10.1016/0148-9062(87)92503-4.

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Mutinda, E. K., B. O. Alunda, D. K. Maina, and R. M. Kasomo. "Prediction of rock fragmentation using the Kuznetsov-Cunningham-Ouchterlony model." Journal of the Southern African Institute of Mining and Metallurgy 121, no. 3 (2021). http://dx.doi.org/10.17159/2411-9717/1401/2021.

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SYNOPSIS Assessment of blast fragment size distribution is critical in mining operations because it is the initial step towards mineral extraction. Different empirical models and techniques are available for predicting and investigating the consequences of blasting, one of which is the Kuznetsov-Cunningham-Ouchterlony (KCO) model. In this paper we summarize the advances in the empirical models from inception until now, and explore the improvements that have been made so far with particular emphasis is on the most recent KCO model. Utilization of the model and the errors that arise between expected and the actual outcomes are analysed. The results indicate that the KCO model remains useful for predicting the blast fragmentation at limestone mine sites, despite the availability of other advanced prediction models. It is also a valuable instrument for pre-surveying the impact of varying certain parameters of a blast plan. Keywords: blasting, rock fragmentation, modelling, prediction.

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Changyan, Chen, Wang Sijing, and Shen Xiaoke. "Engineering geological assessment of the permanent ship lock slope, the Three Gorges Project, China." Journal of Nepal Geological Society 22 (December 1, 2000). http://dx.doi.org/10.3126/jngs.v22i0.32302.

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The permanent ship lock slope of the Three Gorges Project was excavated through the hill of granite massif with the aspect of SE(106°). Some problems of engineering geology (such as statistical features of rock mass structure) were comprehensively studied based on field investigation and numerical analysis. The numerical modelling techniques including damage variable and finite element analysis were used for the detailed study of the effect of excavation and blasting on rock mass quality and slope stability. The analyses indicate that the rock mass is relatively intact and rock mass quality varies mainly from Class I to Class II. Consequently, the overall stability of slope can be ensured except for some minor local unstable blocks.

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Córdova, E., I. Gottreux, A. Anani, A. Ferrada, and J. S. Contreras. "Blasting and preconditioning modelling in underground cave mines under high stress conditions." Journal of the Southern African Institute of Mining and Metallurgy 121, no. 2 (2021). http://dx.doi.org/10.17159/2411-9717/1274/2021.

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SYNOPSIS Cave mining is an underground mass mining technique. The largest projects, which are known as 'super caves', produce hundreds of thousands of tons of ore per day, which involves large footprints with considerable column height, and have a life of mine of over 20-40 years. These operations are typically located deep, under high stresses and in competent rock masses, making initiation and propagation of the caving process harder to manage. These challenges must be confronted by optimizing the fragmentation of the orebody to achieve smaller size blocks that will result in consistent caving and improved flow of the ore from the drawpoints. To achieve better performance from the drawpoints, preconditioning is applied to fragment and damage the material required to cave. We present a proposed design for preconditioning in underground mines, considering the challenges that these large-scale mines are already facing, based on a comprehensive analysis of current design parameters, case studies, and sensitivity analyses using numerical models. Keywords: fragmentation, preconditioning, caving, blasting, structures, stresses, explosives.

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Wang, Y., B. Zhang, B. Li, and CH Li. "A strain-based fatigue damage model for naturally fractured marble subjected to freeze-thaw and uniaxial cyclic loads." International Journal of Damage Mechanics, June 18, 2021, 105678952110216. http://dx.doi.org/10.1177/10567895211021629.

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The naturally fractured rock in the open pit slope is susceptible to irreversible damage caused by fatigue loads related to freeze-thaw weathering, blasting vibration, earthquakes and tramcar traffic. To ensure the safety of rock mass and reveal how natural fracture affects the damage modelling characteristics is of great concern. Hence, this work aims at investigating the fatigue damage evolution of rock from volumetric deformation caused by F-T and cyclic loads. The rock structural deterioration and damage accumulation were investigated as well as the stimulated natural fracture pattern. Results show the frost heaving force acted on natural fracture results in the rock volumetric changes. The damage variable expressed by volumetric strain presents a linear relationship with freeze-thaw cycles. In addition, the axial, lateral and volumetric strain of marble exposed to cyclic loads present a two-stage pattern, they first increase quickly and then get to steady and last for a long time. A new fatigue damage model was established by considering the freeze-thaw damage and mechanical damage simultaneously. The proposed coupling damage model can well describe rock damage accumulation. Moreover, the CT images further reveal the influence of the natural fracture on rock volumetric deformation and the final damage accumulation. It is suggested that the opening-mode natural fractures contribute a lot to rock freeze-thaw deformation and fatigue deformation.

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Guo, Hongquan, Hoang Nguyen, Xuan-Nam Bui, and Danial Jahed Armaghani. "A new technique to predict fly-rock in bench blasting based on an ensemble of support vector regression and GLMNET." Engineering with Computers, August 2, 2019. http://dx.doi.org/10.1007/s00366-019-00833-x.

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30

Bach, Lis, Morten Holtegaard Nielsen, and Sandra M. Bollwerk. "Environmental Impact of Submarine Rock Blasting and Dredging Operations in an Arctic Harbor Area: Dispersal and Bioavailability of Sediment-Associated Heavy Metals." Water, Air, & Soil Pollution 228, no. 6 (May 9, 2017). http://dx.doi.org/10.1007/s11270-017-3363-z.

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Journal articles on the topic 'Rock blasting modelling'

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