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Drill bit wear monitoring and failure prediction for mining automation

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International Journal of Mining Science and Technology 2023年第3期33卷 289-296页

作者： Hamed Rafezi ferri hassani Department of Mining and Materials Engineering McGill UniversityMontreal H3A 0G4Canada

This article introduces a novel approach for tricone bit wear condition monitoring and failure prediction for surface mining applications.A successful bit health monitoring system is essential to achieve fully autonomous blasthole *** this research in-situ vibration signals were analyzed in timefrequency domain and signals trend during tricone bit life span were investigated and introduced to support the development of artificial intelligence(AI)*** addition to the signal statistical features,wavelet packet energy distribution proved to be a powerful indicator for bit wear *** artificial neural network(ANN)models were designed,trained and evaluated for bit state ***,an ANN architecture and feature vector were introduced to classify the bit condition and predict the bit failure.

关键词： Drilling vibration Condition monitoring Failure prediction Bit wear Wavelet energy Mining automation

Stability analysis of slopes with planar failure using variational calculus and numerical methods

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Frontiers of Structural and Civil Engineering 2020年第5期14卷 1262-1273页

作者： Norly BELANDRIA RobertoÚCAR Francisco M.LEON ferri hassani Geological Engineering School University of Los AndesMérida 5101Venezuela Mechanical Engineering School University of Los AndesMérida 5101Venezuela Department of Mining and Material Engineering McGill UniversityMontrealQC H3A 0E9Canada

This study investigates the technique of variational calculus applied to estimate the slope stability considering the mechanism of planar *** critical plane failure surface should be determined because it theoretically indicates the most unfavorable plane to be considered when stabilizing a slope to rectify the instability generated by several statistically possible *** generates integrals that can be solved by numerical methods,such as the Newton Cotes and the finite differences ***,a system of nonlinear equations is obtained and *** surface of the critical planar failure is determined by applying the condition of transversality in mobile boundaries,for which various examples are *** number of slices is varied in one of the examples,while the surface of the critical planar failure is determined in the *** are compared using analytical methods through axis *** the results obtained by considering normal stress,safety factors,and critical planar failure are nearly the same;however,in this research,a study is carried out for“n”number of slices using programming ***-routines are important because they can be applied in slopes with different geometry,surcharge,interstitial pressure,and pseudo-static load.

关键词： slopes stability planar failure variational calculus numerical methods

Friction factor correlation for airflow through broken rocks and its applications in mine ventilation

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International Journal of Mining Science and Technology 2020年第4期30卷 455-462页

作者： Leyla Amiri Seyed Ali Ghoreishi-Madiseh ferri P.hassani Agus P.Sasmito Department of Mining and Materials Engineering McGill UniversityMontrealQuebec H3A 2A7Canada Norman B.Keevil Institute of Mining Engineering University of British ColumbiaVancouverBritish Columbia V6T 1Z4Canada

The Atkinson equation along with its friction factor is commonly used to estimate pressure requirement in mine ***,friction factor correlation of flow through broken rock,typically found in blasted stope,gob,rock pit or block caving rock deposits,etc.,is currently ***,it is impractical to conduct direct measurements of flow resistance in an inaccessible broken rock *** paper aims to develop a new friction factor correlation of flow through broken rock that can be used directly in Atkinson *** proposed correlation is valid for broken rocks with diameter between 0.04 and 1.2 m and porosity ranging from 0.23 to 0.7.

关键词： Broken rock Fractured rock Packed rock bed Large particle Pressure drop Friction factor

The influence of microwave irradiation on rocks for microwaveassisted underground excavation

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第1期8卷 1-15页

作者： ferri hassani Pejman M.Nekoovaght Nima Gharib Department of Mining and Material Engineering McGill University

Demand is growing for explosive-free rock breakage systems for civil and mining engineering, and space industry applications. This paper highlights the work being undertaken in the Geomechanics Laboratory of Mc Gill University to make a real application of microwave-assisted mechanical rock breakage to fullface tunneling machines and drilling. Comprehensive laboratory tests investigated the effect of microwave radiation on temperature profiles and strength reduction in hard rocks(norite, granite, and basalt)for a range of exposure times and microwave power levels. The heating rate on the surface of the rock specimens linearly decreased with distance between the sample and the microwave antenna, regardless of microwave power level and exposure time. Tensile and uniaxial compressive strengths were reduced with increasing exposure time and power level. Scanning electron micrographs(SEMs) highlighted fracture development in treated basalt. It was concluded that the microwave power level has a strong positive influence on the amount of heat damage induced to the rock surface. Numerical simulations of electric field intensity and wave propagation conducted with COMSOL Multiphysics~ software generated temperature profiles that were in close agreement with experimental results.

关键词： Microwaves Crack density Microwave-assisted tunnel boring Rock breakage

Experimental investigation on the effects of microwave irradiation on kimberlite and granite rocks

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 267-274页

作者： Samir M.Deyab Hamed Rafezi ferri hassani Mehrdad Kermani Agus P.Sasmito Department of Mining and Materials Engineering McGill UniversityMontrealCanada

This study is a part of an overall research project on the effects of microwave(MW)irradiation on rocks for assisted rock breaking systems as well as mineral processing at McGill *** the first time,this paper highlights a comprehensive investigation on the effects of microwave irradiation on Canadian *** contribution to the continuous rock excavation and rock weakening effect prior to implementation of mechanical techniques was *** different kimberlite rocks,*** kimberlite(VK)and hypabyssal kimberlite(HK),and granite samples were *** important physical properties of the rock samples were measured including rock quality designation(RQD),specific gravity,porosity,and specific heat *** samples were treated for various exposure times using a multi-mode MWunit at different power levels ranging from 2 kW to 15 *** effect of MW irradiation on rock samples was *** results indicate that the mechanical properties including unconfined compressive strength(UCS)and Brazilian tensile strength(BTS)were significantly dropped as a result of ***,the effect on rock abrasivity using the Cerchar abrasivity index(CAI)has also been discussed.

关键词： Microwave irradiation Kimberlite Rock excavation Rock strength Abrasivity

Introduction and evaluation of a novel hybrid brattice for improved dust control in underground mining faces: A computational study

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International Journal of Mining Science and Technology 2015年第4期25卷 537-543页

作者： Kurnia Jundika C. Sasmito Agus P. hassani ferri P. Mujumdar Arun S. Mechanical Engineering Department Universiti Teknologi PETRONAS Department of Mining and Materials Engineering McGill University

A proper control and management of dust dispersion is essential to ensure safe and productive underground working environment. Brattice installation to direct the flow from main shaft to the mining face was found to be the most effective method to disperse dust particle away from the mining face. However,it limits the movement and disturbs the flexibility of the mining fleets and operators at the tunnel. This study proposes a hybrid brattice system- a combination of a physical brattice together with suitable and flexible directed and located air curtains- to mitigate dust dispersion from the mining face and reduce dust concentration to a safe level for the working operators. A validated three-dimensional computational fluid dynamic model utilizing Eulerian–Lagrangian approach is employed to track the dispersion of dust particle. Several possible hybrid brattice scenarios are evaluated with the objective to improve dust management in underground mine. The results suggest that implementation of hybrid brattice is beneficial for the mining operation: up to three times lower dust concentration is achieved as compared to that of the physical brattice without air curtain.

关键词： Dust dispersion Hybrid brattice Underground mine Ventilation

SPH-FEM simulations of microwave-treated basalt strength

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Transactions of Nonferrous Metals Society of China 2022年第6期32卷 2003-2018页

作者： Chun YANG ferri hassani Ke-ping ZHOU Feng GAO Ameen TOPA School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mining and Materials Engineering McGill University3450 UniversityFrank Dawson Adams Bldg.MontrealQC H3A 0E8Canada Research Center for Mining Engineering and Technology in Cold Regions Central South UniversityChangsha 410083China Institute of Transportation Infrastructure Universiti Teknologi PETRONASSeri IskandarPerak 32610Malaysia Department of Maritime Technology University Malaysia TerengganuKuala Terengganu 21300Malaysia

Microwave precondition has been highlighted as a promising technology for softening the rock mass prior to rock breakage by machine to reduce drill bit/cutter wear as well as inverse production *** numerically explore the effect of numerical parameters on rock static strength simulation,and determine the numerical mechanical parameters of microwave-treated basalts for future drilling and cutting simulations,numerical models of uniaxial compression strength(UCS)and Brazilian tensile strength(BTS)were established with the coupling of smoothed particle hydrodynamics and finite element method(SPH-FEM).To eliminate the large rock strength errors caused by microwave-induced damage,the cohesion and internal friction angle of microwave-treated basalt specimens with the same microwave treatment parameters were calibrated based on a linear Mohr-Coulomb *** on parametric sensitivity analysis of SPH simulation of UCS and BTS,experimental UCS and BTS values were simultaneously captured according to the same set of calibrated cohesion and internal friction angle data,and the UCS modeling results are in good agreement with experimental ***,the effect of microwave irradiation parameter on the basalt mechanical behaviors was evaluated.

关键词： microwave irradiation microwave-assisted rock breakage rock mechanics smoothed particle hydrodynamics(SPH) parametric sensitivity analysis

Numerical and experimental analyses of rock failure mechanisms due to microwave treatment

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2483-2495页

作者： Haitham M.Ahmed Adel Ahmadihosseini ferri hassani Mohammed A.Hefni HussinA.M.Ahmed Hussein A.Saleem Essam B.Moustafa Agus P.Sasmito Mining Engineering Department King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A0E8Canada Mechanical Engineering Department King Abdulaziz UniversityJeddah21589Saudi Arabia

Despite the extensive studies conducted on the effectiveness of microwave treatment as a novel rock preconditioning method,there is yet to find reliable data on the rock failure mechanisms due to microwave *** addition,there is no significant discussion on the energy efficiency of the method as one of the important factors among the mining and geotechnical engineers in the *** study presents a novel experimental method to evaluate two main rock failure mechanisms due to microwave treatment without applying any mechanical forces,*** and concentrated *** result shows that the existence of a small and concentrated fraction of a strong microwave absorbing mineral will change the failure mechanism from the distributed heating to the concentrated heating,which can increase the weakening over microwave efficiency(WOME)by more than 10 *** observation is further investigated using the developed coupled numerical *** is shown that at the same input energy,the existence of microwave absorbing minerals can cause major heat concentration inside the rock and increase the maximum temperature by up to three times.

关键词： Microwave treatment Numerical modeling Failure mechanism Energy efficiency Rock pre-conditioning

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微波辅助机械破岩试验和理论研究进展

岩土工程学报 2016年第8期38卷 1497-1506页

作者：卢高明李元辉 hassani ferri 张希巍深部金属矿山安全开采教育部重点实验室辽宁沈阳110819 麦吉尔大学采矿与材料工程系

微波辅助机械破岩是微波加热技术和机械破岩技术相结合的一种混合型破岩方法。岩石内不同矿物成分对微波能具有不同的吸收特性,各矿物不同的热膨胀产生的内应力使岩石内发生沿晶断裂和穿晶断裂,使试样产生损伤和微裂纹,这会引起岩石强... 详细信息

微波辅助机械破岩是微波加热技术和机械破岩技术相结合的一种混合型破岩方法。岩石内不同矿物成分对微波能具有不同的吸收特性,各矿物不同的热膨胀产生的内应力使岩石内发生沿晶断裂和穿晶断裂,使试样产生损伤和微裂纹,这会引起岩石强度的降低。辐射功率和辐射时间是影响岩石力学特性的重要参数,一定功率的微波辐射处理后,试样的点荷载强度、单轴抗压强度和抗拉强度发生显著降低,微波功率越高,辐射时间越长,对试样强度的折减效果越明显。数值研究结果与试验研究结果基本一致,增加功率的同时降低辐射时间对试样强度折减具有更好的效果。岩石点荷载强度、单轴抗压强度和抗拉强度的降低能够显著提高机械破岩设备刀具的侵入率和刀具寿命,解决机械刀具的磨损问题。微波辅助机械破岩对钻孔、TBM掘进和实现金属矿矿岩连续开采都具有重要影响作用。

关键词：微波辅助破岩岩石破碎强度折减连续采矿