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Effects of Sublevel Open Stope Underground m.ning on Surface and Open Pit Slopes

Journal of Geoscience and Environm.nt Protection 2021年第1期9卷 121-131页

作者： tumelo k. m. dintwe Tak.shi Sasaok. Hidek. Shim.da Ak.hiro Ham.nak. Dyson m.ses Sifei Liu Fanfei m.ng Departm.nt of Earth Resources Engineering Kyushu University Fukuoka Japan China University of Science and Technology Xuzhou China

Underground m.ning is an econom.cally viable option for exploiting ore reserves deem.d uneconom.c after open pit m.ning. However, underground developm.nt can have adverse effects on the above existing open pit slope walls. As a goal of this paper, identification and assessm.nt of potential slope instabilities prior to underground developm.nt is crucial for safe and sustainable m.ning. Towards goal achieving, this paper gives a com.rehensive param.tric study to investigate the influence of sublevel open stope (SLOS) underground m.ning on the surface and open pit slope walls. By m.ans of num.rical sim.lation, the SLOS design is tried against the existing open pit followed by adjustm.nts of im.ortant slope param.ters which are overall slope height (OSH) and overall slope angle (OSA). We found that underground m.ning m.y induce slope failure, particularly on the hangingwall side of the pit. Subsidence is prom.nent on the hanging wall and the surface, whereas, the uplift dom.nates the footwall and pit bottom. Pit wall closure is observed during underground m.ning. Although the assigned dim.nsions in the param.tric study show a negligible effect of OSH and OSA, the high OSH experience low subsidence in com.arison with low OSH. Overall, the results dem.nstrate that the slope walls on the hanging wall side are m.stly affected by the underground m.ning and high-stress concentration prevails near slope toes and pit bottom. Additionally, slope deform.tion decrease from.pit bottom.towards the slope crest and surface. The results of this study add k.owledge to open pit and underground m.ning interaction.

关键词： Open Pit-Underground Interaction Slope Stability Underground m.ning Subsidence

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Study of Internal Waste Dum.-Induced Shear Stress Behavior on Pit-Slope

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Journal of Geoscience and Environm.nt Protection 2020年第4期8卷 71-86页

作者： Sugeng Wahyudi Hidek. Shim.da Tak.shi Sasaok. Ak.hiro Ham.nak. Tsedendorj Am.rsaik.an Pisith m.o tumelo k. m. dintwe Dyson m.ses Departm.nt of Earth Resources Engineering Kyushu University Fukuoka Japan m.ning Research and Design Center Mongolian University of Science and Technology Sukhbaatar Mongolia

Regardless of beneficial associated with internal waste dum. (IWD) m.thod, practices of this m.thod within boundaries of pit-slope have som. serious problem. on stability issues due to this area is zone of potential failure. This zone is k.own as dynam.c reactive zone which is easy to deform.by external force, and inherent dangers of failure posing a threat to slope. Therefore, it is param.unt to study the induced shear stress behavior in this zone particularly when IWD m.thod is adopted within this zone. In this paper, a num.rical study for investigating IWD-induced shear stress behavior has been carried out using Finite Elem.nt m.thod (FEm. with Strength Reduction approach. Different scenarios as per pit-slope depths, IWD heights and buffer zone lengths have been accounted and sim.lated using PHASE 2 to understand changes in induced shear stress im.osed on the pit-slope. It is found that shear stress im.osed on pit slope seem. change dram.tically with increasing IWD height for case of buffer zone length is less than 100-m.long.

关键词： Slope Stability Internal Waste Dum. Shear-Stress Num.rical Sim.lation

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Tim. effect and prediction of brok.n rock.bulk.ng coefficient on the base of particle discrete elem.nt m.thod

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International Journal of m.ning Science and Technology 2021年第4期31卷 643-651页

作者： Fanfei m.ng Hai Pu Tak.shi Sasaok. Hidek. Shim.da Sifei Liu tumelo k. dintwe Ziheng Sha Departm.nt of Earth Resources Engineering Faculty of EngineeringKyushu UniversityFukuoka 819-0395Japan State k.y Laboratory for Geom.chanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China College of m.ning Engineering and Geology Xinjiang Institute of EngineeringUrumqi 830023China

Bulk.ng characteristics of gangue are of great significance for the stability of goafs in m.ning overburden in the caving *** this paper,a particle discrete elem.nt m.thod with clusters to represent gangue was adopted to explore the bulk.ng coefficient tim. effect of the brok.n rock.in the caving zone under three-dim.nsional triaxial com.ression *** phenom.na of stress corrosion,deform.tion,and failure of rock.block. were sim.lated in the num.rical ***,a new criterion of rock.fragm.nts dam.ge was put *** was found that the brok.n rock.has obvious viscoelastic properties.A new equation based on the Burgers creep m.del was proposed to predict the bulk.ng coefficient of brok.n rock.A deform.tion characteristic param.ter of the prediction equation was analyzed,which can be set as a fixed value in the m.d-and long-term.prediction of the bulk.ng *** are quadratic function relationships between the deform.tion characteristic param.ter value and Talbot gradation index,axial pressure and confining pressure.

关键词： Bulk.ng coefficient Tim. effect Deform.tion prediction Brok.n rock Particle discrete elem.nt m.del

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Rock.Slope Stability Analysis by Using Integrated Approach

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World Journal of Engineering and Technology 2020年第3期8卷 405-428页

作者： Dyson m.ses Hidek. Shim.da Tak.shi Sasaok. Ak.hiro Ham.nak. tumelo k. dintwe Sugeng Wahyudi Departm.nt of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan

Slope stability assessm.nt is an essential aspect of m.ning and civil engineering. In this study, Songwe open-pit m.ne in m.lawi was investigated to establish possible pit slope instability. In perform.ng the analysis... 详细信息

Slope stability assessm.nt is an essential aspect of m.ning and civil engineering. In this study, Songwe open-pit mine in Malawi was investigated to establish possible pit slope instability. In performing the analysis, an integrated approach entailing rock mass characterisation, kinematic and numerical methods were applied. Based on rock mass classification system, Songwe Hill carbonatite rock mass is characterised as a good rock but still it possesses numerous random discontinuities that present a complex challenge in geotechnical engineering. Dip 6.0 software was used in carrying out kinematic analysis based on the attributes of discontinuities. The results show that there is a 16% likelihood of planar failure in the divided slope sections of the planned pit. Thus, slope angle optimisation to 41° has been proposed as a counter-m.asure to m.nim.se the potential risk.of planar failure. At the optim.sed angle, the risk.of planar failure could be reduced by 44%. On the other hand, wedge failure was found to be im.robable since no joint intersections were found in the critical zone of potential failure. For num.rical analysis, finite elem.nt code was applied using FLAC3D 5.0 application. The results demonstrate that overall slope angle of 41° would offer a favourable balance between safety and m.ning econom.cs as m.ning operations progress to deeper horizons thereby avoiding a costly push back solution due to instability.

关键词： Songwe Hill Carbonatite k.nem.tic Analysis Num.rical Analysis Slope Stability

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Evaluating Rock.m.ss Properties of Vipingo Coral Lim.stone Quarry Based on a m.dified Geological Strength Index (GSI) and State of k.rstification

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Open Journal of Geology 2022年第1期12卷 57-79页

作者： Joan Atieno Onyango Tak.shi Sasaok. Hidek. Shim.da Ak.hiro Ham.nak. Dyson m.ses dintwe tumelo Earth Resources Engineering Departm.nt Kyushu University Fukuoka Japan m.ning Materials and Petroleum Engineering Department Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

The process of evaluating rock.m.ss strength requires that m.jor structural features such as joints that influence rock.strength are considered. In carbonate rock.m.sses, however, the strength of the rock.m.ss is largely dependent on intact rock.strength and structural features play a secondary role. Laboratory experim.nts on porous rock.have shown that intact rock.strength reduces with increasing porosity, which has a direct effect on the rock.m.ss strength. Rock.porosity has however not been well accounted for in rock.m.ss characterization m.thods currently in use. This research applies the m.dified GSI m.thod for carbonate rock.m.sses which is based on a com.ination of GSI and total porosity. The m.in aim.is to quantify the GSI with respect to rock.porosity which is a direct indicator of the state of k.rstification, as an inherent feature that affects rock.m.ss strength. An em.irical equation is proposed whereby the GSI as observed in the field is m.dified by a natural log of the value of porosity, giving rise to a m.dified GSI (GSIm./sub>). The GSIm./sub> together with laboratory properties of rock.is used to determ.ne the properties of Vipingo coral lim.stone from.RocLab software. A determ.nistic param.tric slope stability analysis is done using the finite elem.nt software Phase 2 with the rock.m.ss properties as input param.ters. The analysis results point to a direct dependence of the slope stability on slope angle, slope height and rock.m.ss strength of the lithological unit. The graphs m.k. a useful design guide for slopes engineered in this type of rock.m.ss.

关键词： Carbonates k.rstification Porosity Rock.m.ss Strength Slope Stability Weak.Rock

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