Proceedings of the Ninth International Conference on Deep and High Stress Mining最新文献_第3页

Support and reinforcement damage initiation and design adjustments in a deep mine environment Case study: Cuiabá Mine, Minas Gerais, Brazil 深部矿山环境下支护加固损伤起爆及设计调整研究——以巴西米纳斯吉拉斯州cuiab<e:1>矿为例

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_08_COSTA

L. Costa, R. Padula, Lmv Pimenta, R. Pereira, Dt Peterle

{"title":"Support and reinforcement damage initiation and design adjustments in a deep mine environment Case study: Cuiabá Mine, Minas Gerais, Brazil","authors":"L. Costa, R. Padula, Lmv Pimenta, R. Pereira, Dt Peterle","doi":"10.36487/ACG_REP/1952_08_COSTA","DOIUrl":"https://doi.org/10.36487/ACG_REP/1952_08_COSTA","url":null,"abstract":"As the deepening of an underground mine occurs, dynamic events (rockbursts) or high deformation ground conditions can occur. The Cuiaba underground gold mine (AngloGold Ashanti, Minas Gerais, Brazil) which is around 1300 m deep, started to experience some of these issues. High deformation associated with bulking and buckling was experienced in the main decline resulting in many rehabilitation stages. Aiming to better understand and reduce the impact of this behaviour, a damage mapping of the support and reinforcement were carried out in the Serrotinho decline. \u0000Field measurements of deformation were also undertaken. It was then possible to correlate the numerical modeling outputs with the observed damage and suggest design changes. Based on the observed mechanisms, as well as the reinforcement and support damage experienced in the decline, laboratory tests were necessary to adjust the rock bolt face plate capacity and redefine the most adequate rock bolt and surface support combination to guarantee the functionality of the whole support system.","PeriodicalId":213743,"journal":{"name":"Proceedings of the Ninth International Conference on Deep and High Stress Mining","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114543004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Laboratory full-scale rock bolt testing: Analysis of recent results 实验室全尺寸锚杆试验:最近结果分析

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_17_HAGEN

S. Hagen, T. Larsen, A. Berghorst, G. Knox

引用次数: 1

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_31_MORTON

E. Morton, E. Villaescusa, A. Thompson

{"title":"Self-similarity in rock fracturing and the behaviour of large-scale faults in the mining environment","authors":"E. Morton, E. Villaescusa, A. Thompson","doi":"10.36487/ACG_REP/1952_31_MORTON","DOIUrl":"https://doi.org/10.36487/ACG_REP/1952_31_MORTON","url":null,"abstract":"Seismicity and earthquakes are the consequences of rock mass fracturing. Laboratory testing has been used to simulate rock fracturing mechanisms since the 1960s, including by Mogi (1962), Scholz ( 1968), Hardy ( 1972), Hirata, Sato and Iko (1987), Main and Meredith (1989) and Lei et al (1992). These investigations suggest that rock fracturing has similar characteristics on all scales. They also reveal that seismic data contains precursory information that can suggest impending failure. Each of these researchers has used their analysis techniques to investigate large-scale earthquake behaviour; however only limited investigations of mining seismicity have been undertaken to-date. \u0000Morton (2019) has investigated almost 700 failures in the mining environment that are specifically related to large-scale faults. The aim of the analysis was to determine if fracturing data patterns recognised in small scale laboratory samples could be recognised in real-life mining data and if so, could be used to identify failure within the mining environment. Various analysis methods were presented. New techniques were developed to select seismic events specific to selected large-scale structures within the mining environment. This enabled the analysis of the behaviour of these individual structures. Analysis was conducted on temporal variations in event rate, spatial correlation length and b-value, magnitude and energy. \u0000This paper provides a summary of some of the results determined with the research. Analysis of event rate, magnitude and spatial correlation length are provided within this paper. The analysis method and the trends in the each of these parameters will be presented.","PeriodicalId":213743,"journal":{"name":"Proceedings of the Ninth International Conference on Deep and High Stress Mining","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124736081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modern seismic is illuminating the depths 现代地震正在照亮深处

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_27_VAN_BUREN

R. V. Buren, G. Turner, G. Hird

引用次数: 0

Advanced techniques for the monitoring of pillar and excavation behaviour at a deep level massive mine 深部大体积矿山矿柱及开挖动态监测的先进技术

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_11_ANDREWS

P. Andrews, L. Rwodzi, J. Ekkerd, N. Ratshitaka

{"title":"Advanced techniques for the monitoring of pillar and excavation behaviour at a deep level massive mine","authors":"P. Andrews, L. Rwodzi, J. Ekkerd, N. Ratshitaka","doi":"10.36487/ACG_REP/1952_11_ANDREWS","DOIUrl":"https://doi.org/10.36487/ACG_REP/1952_11_ANDREWS","url":null,"abstract":"The mining methods used at South Deep started with conventional mining (pre-1998), which later evolved into mechanized mining with various layouts for drifting and benching, low-profile horizontal destressing with crush pillars and long hole stoping (LHS). The mining method was then changed during 2015-2016 to the current high profile destress with LHS. Pillars in the destress cuts are designed to yield and not pose a significant rock burst risk. \u0000High profile development was initially conducted using smaller pillars (4.5 m x 10 m and 6 m x 10 m) which completely yielded however, as these were prone to excessive scaling and extensive rehabilitation requirements. Numerical modelling was conducted by Lilly, (2016), to optimise the destress pillar dimensions. The study concluded that a larger yield pillar is viable in the high profile destress cuts. \u0000The new pillar design was still not proven in situ owing to lack of information regarding to yielding, closure rates, convergence and fracturing through the core as well as the transition between the old and new mining layout. \u0000As a first approach, borehole camera surveys were conducted to assess the pillar conditions. Ground penetrating radar (GPR) technology was then used to determine fracturing around the yield pillars and where possible, the results where compared to the borehole camera surveys. \u0000A Zeb Revo scanner was then used to obtain accurate closure and pillar yield performance. This data was used to calibrate actual vs model-predicted displacements and to calibrate numerical models, reconciling pillar and also pro-actively identify areas that were undergoing extensive deformation. \u0000This paper will describe the outcome of the above-mentioned monitoring and reconciliation programmes and the interpretation of the results.","PeriodicalId":213743,"journal":{"name":"Proceedings of the Ninth International Conference on Deep and High Stress Mining","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116829521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Anisotropic rock mass behaviour in large deformation ground at CSA mine CSA矿大变形地基各向异性岩体特性

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_23_SHARROCK

G. Sharrock, B. Chapula

引用次数: 1

Ideal stope profile to manage seismicity in deep tabular narrow reef mines 深板状窄礁矿山控制地震活动的理想采场剖面

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_22_RAKUMAKOE

O. Rakumakoe

引用次数: 1

Numerical modelling of the high rock stress challenges at Rana mine, Norway 挪威Rana矿高岩石应力挑战的数值模拟

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_09_TRINH

NQ Trinh, TE Larsen, S Molund, B Nøst, A. Kuhn

{"title":"Numerical modelling of the high rock stress challenges at Rana mine, Norway","authors":"NQ Trinh, TE Larsen, S Molund, B Nøst, A. Kuhn","doi":"10.36487/ACG_REP/1952_09_TRINH","DOIUrl":"https://doi.org/10.36487/ACG_REP/1952_09_TRINH","url":null,"abstract":"Rana Gruber AS is an iron mining company in the north of Norway, and operates the Kvannevann mine 30 km east of Mo i Rana. The Kvannevann mine is located in a foliated gneiss host rock, with an ore body about 70 m wide and more than 300 m deep. During the history of the mine, it has been in operation for many years using an open-pit mining method, which was later it converted to sublevel-stoping. After thorough planning and preparation, the sub-level cave mining method was put in operation in 2012. Experience from past mining activities and in the preparation of infrastructure for the new mining method indicates that the mine is located in a hard, brittle rock mass with high horizontal stresses. Stress measurements have been made from time to time. The measurement results indicate a major principal stress of approximately 20 MPa perpendicular to the strike of the ore, and a minor principal stress of approximately 10 MPa parallel to the strike of the ore, which is 10–15 times higher than the theoretical vertical stress caused by gravity at the measured location. This paper presents some challenges related to high stress during development and operation of the mine. The paper also presents a comprehensive rock mechanics program, applying a combination of stress measurements, numerical modelling, and monitoring, to deal with the situation.","PeriodicalId":213743,"journal":{"name":"Proceedings of the Ninth International Conference on Deep and High Stress Mining","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128806104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Accounting for rock mass heterogeneity and buckling mechanisms in the study of excavation performance in foliated ground at Westwood mine 考虑岩体非均质性和屈曲机制的西木矿片理地基开挖性能研究

Proceedings of the Ninth International Conference on Deep and High Stress Mining Pub Date : 2019-06-24 DOI: 10.36487/ACG_REP/1952_03_BOUZERAN

L. Bouzeran, M. Pierce, P. Andrieux, E. Williams

{"title":"Accounting for rock mass heterogeneity and buckling mechanisms in the study of excavation performance in foliated ground at Westwood mine","authors":"L. Bouzeran, M. Pierce, P. Andrieux, E. Williams","doi":"10.36487/ACG_REP/1952_03_BOUZERAN","DOIUrl":"https://doi.org/10.36487/ACG_REP/1952_03_BOUZERAN","url":null,"abstract":"Operations at Westwood mine in Quebec, Canada, were temporary halted in May 2015 after three large-magnitude seismic events occurred over two days. The mechanisms leading to these events, which caused severe damage to several accesses, were not well understood at first. This was partly due to the complex geology at the site, where massive, unaltered, strong, brittle, and seismically active rock can alternate with highly altered, weak, foliated, and buckling-prone rock at the meter scale. Other ground behaviours such as the significant discrepancy in blasthole performance between secondary and primary stopes and the propagation of damage from stopes to haulage drives in some locations were also not well understood. In 2017, further geotechnical characterization of the rock mass was carried out and numerical back-analyses of several locations were completed using the continuum code FLAC3D. The objectives of the back analyses were to better understand the mechanisms controlling rock mass performance and to obtain a calibrated model for predictive stoping simulations. This paper presents the key aspects of the modelling, which include: (1) An anisotropic rock mass strength model with properties derived from field and lab strength testing, and (2) a scheme to account implicitly for the deconfinement that accompanies buckling around excavations.","PeriodicalId":213743,"journal":{"name":"Proceedings of the Ninth International Conference on Deep and High Stress Mining","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128473571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3