Abstract: The paper presents an analysis of the rock mass deformation resulting from mining in the vicinity of the shaft protection pillar. A methodology of deformation prediction is based on a deterministic method using Finite Element Method (FEM). The FEM solution is based on the knowledge of the geomechanical properties of the various geological formations, tectonic faults, types of mining systems, and the complexity of the behaviour of the rock mass. The analysis gave the stress and displacement fields in the rock mass. Results of the analysis will allow for design of an optimal mining system. The analysis is illustrated by an example of the shaft R-VIII Rudna Mine KGHM Polish Copper SA.
{"title":"Integrated analysis of rock mass deformation within shaft protective pillar","authors":"E. Warchala, A. Szostak-Chrzanowski","doi":"10.5277/MSC152202","DOIUrl":"https://doi.org/10.5277/MSC152202","url":null,"abstract":"Abstract: The paper presents an analysis of the rock mass deformation resulting from mining in the vicinity of the shaft protection pillar. A methodology of deformation prediction is based on a deterministic method using Finite Element Method (FEM). The FEM solution is based on the knowledge of the geomechanical properties of the various geological formations, tectonic faults, types of mining systems, and the complexity of the behaviour of the rock mass. The analysis gave the stress and displacement fields in the rock mass. Results of the analysis will allow for design of an optimal mining system. The analysis is illustrated by an example of the shaft R-VIII Rudna Mine KGHM Polish Copper SA.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"22 1","pages":"23-32"},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91312317","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}
{"title":"Clean Coal Technologies in every stage of coal production in Polish industry","authors":"P. Pięta","doi":"10.5277/MS150209","DOIUrl":"https://doi.org/10.5277/MS150209","url":null,"abstract":"","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"12 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79408791","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}
The paper analyses the results of the strength tests of finger splices of conveyor belts carried out at the Belt Transport Laboratory (LTT). The article presents a statistical analysis of data and assessment the reasons of the reduced strength of finger splices. The results of these tests are a valuable source material, which should be used in further works.
{"title":"Analysis of the results of the strength tests of finger splices","authors":"A. Kirjanów","doi":"10.5277/MS150203","DOIUrl":"https://doi.org/10.5277/MS150203","url":null,"abstract":"The paper analyses the results of the strength tests of finger splices of conveyor belts carried out at the Belt Transport Laboratory (LTT). The article presents a statistical analysis of data and assessment the reasons of the reduced strength of finger splices. The results of these tests are a valuable source material, which should be used in further works.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"23 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73875382","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}
{"title":"Research on efficiency of heat recovery in the cross-plate heat exchanger made of plastic","authors":"S. Sas, P. Kasprzyk","doi":"10.5277/MS150217","DOIUrl":"https://doi.org/10.5277/MS150217","url":null,"abstract":"","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"220 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83718563","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}
The article relates to the rheological properties of the salt with respect to halokinesis mainly in terms of microstructures. Phenomena are considered in terms of a non-Newtonian fluid, taking into account anomalies for small scales. Experiment on reviewing the movements that have a direct correlation with the deformation (strain) and stress. In the study, the maximum observed values were measured: the incremental displacement vector and finite displacement vector. These indicators together with the deformations can give us full information about the stress of the rock mass. Results of studies in relation to the larger scale could provide consistent information on the salt layer rheology and resistance or susceptibility to deformation of the underlying layers of the above. This would be important information during the construction of mines (for example: oil rig, pithead,mineshaft), drift mining and strip mining.
{"title":"Rheological properties of the salt in relation to halokinesis","authors":"J. Gacek","doi":"10.5277/MS150201","DOIUrl":"https://doi.org/10.5277/MS150201","url":null,"abstract":"The article relates to the rheological properties of the salt with respect to halokinesis mainly in terms of microstructures. Phenomena are considered in terms of a non-Newtonian fluid, taking into account anomalies for small scales. Experiment on reviewing the movements that have a direct correlation with the deformation (strain) and stress. In the study, the maximum observed values were measured: the incremental displacement vector and finite displacement vector. These indicators together with the deformations can give us full information about the stress of the rock mass. Results of studies in relation to the larger scale could provide consistent information on the salt layer rheology and resistance or susceptibility to deformation of the underlying layers of the above. This would be important information during the construction of mines (for example: oil rig, pithead,mineshaft), drift mining and strip mining.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"123 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74238962","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}
The article presents usage of microseismic monitoring for location of microseismic events in polish geological conditions. For location of one synthetic microseismic event, two methods of acquisition were applied: surface and downhole monitoring array. Downhole microseismic monitoring is a technique of recording induced seismicity using receivers placed in the monitoring well near to the treatment well. In case of surface monitoring receivers are placed at the surface. For determination of hypocenter location probability density function was used. Based on provided analysis it is concluded that for polish conditions it is better to use downhole microseismic monitoring. Event located with usage of this technique was located correctly and uncertainty of this location was lower.
{"title":"Differences between downhole and surface micro-seismic monitoring","authors":"Eryk Święch, Pawel Wandycz","doi":"10.5277/MSC152206","DOIUrl":"https://doi.org/10.5277/MSC152206","url":null,"abstract":"The article presents usage of microseismic monitoring for location of microseismic events in polish geological conditions. For location of one synthetic microseismic event, two methods of acquisition were applied: surface and downhole monitoring array. Downhole microseismic monitoring is a technique of recording induced seismicity using receivers placed in the monitoring well near to the treatment well. In case of surface monitoring receivers are placed at the surface. For determination of hypocenter location probability density function was used. Based on provided analysis it is concluded that for polish conditions it is better to use downhole microseismic monitoring. Event located with usage of this technique was located correctly and uncertainty of this location was lower.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"22 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85585607","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}
: In order to achieve the high standards of safety and operational reliability required of belt conveyors, there is a requirement for systematic testing of conveyor belts and their joints. This article describes joint testing methods and presents an analysis of the causes of reduced strength of multi-ply belt joints. Testing was carried out at the Belt Conveying Laboratory (LTT) of Wroclaw University of Technology. Presented here is a proprietary method for the measurement of stress distribution in conveyor belt adhesive joints.
{"title":"Laboratory testing of conveyor textile belt joints used in underground mines","authors":"M. Hardygóra, M. Bajda, R. Blazej","doi":"10.5277/MSC152211","DOIUrl":"https://doi.org/10.5277/MSC152211","url":null,"abstract":": In order to achieve the high standards of safety and operational reliability required of belt conveyors, there is a requirement for systematic testing of conveyor belts and their joints. This article describes joint testing methods and presents an analysis of the causes of reduced strength of multi-ply belt joints. Testing was carried out at the Belt Conveying Laboratory (LTT) of Wroclaw University of Technology. Presented here is a proprietary method for the measurement of stress distribution in conveyor belt adhesive joints.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"21 1","pages":"161-169"},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91053890","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}
{"title":"Modeling and simulation analysis of mine production in 3D environment","authors":"S. Checiński, Andrzej Witt","doi":"10.5277/MSC152215","DOIUrl":"https://doi.org/10.5277/MSC152215","url":null,"abstract":"","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"25 1","pages":"181-189"},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84370731","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}
All methods of rock burst hazard evaluation and control are classified as rock burst prevention. The prevention methods can be divided in two general categories – the passive (non-active) and active ones. Active methods of rock burst prevention focus generally on reducing of stress level in the area of its concentration through controlled tremors and rock bursts by blasting works. Among the active methods the hydraulic fracturing can be noted. Traditional hydraulic fracturing techniques generally form main hydraulic cracks. However, when we combine hydraulic fracturing with blasting we might obtain much better results. For example, the hydraulic crack range becomes wider than by using only conventional methods. In coal seams it is possible to increase permeability which makes gas drainage to be more effective. It is because water shockwaves and bubble pulsations induced by the explosion, cause a high strain rate in the rock mass surrounding the bore hole. When hydraulic fracturing is used, a micro seismic event takes place. This is why micro seismic technologies are used to monitor the range of hydraulic fracturing process. This article is only mentioning the issue which in the Author opinion, deserves more attention.
{"title":"Hydraulic fracturing technology in rock burst hazard controlling","authors":"W. Karkocha","doi":"10.5277/MS150202","DOIUrl":"https://doi.org/10.5277/MS150202","url":null,"abstract":"All methods of rock burst hazard evaluation and control are classified as rock burst prevention. The prevention methods can be divided in two general categories – the passive (non-active) and active ones. Active methods of rock burst prevention focus generally on reducing of stress level in the area of its concentration through controlled tremors and rock bursts by blasting works. Among the active methods the hydraulic fracturing can be noted. Traditional hydraulic fracturing techniques generally form main hydraulic cracks. However, when we combine hydraulic fracturing with blasting we might obtain much better results. For example, the hydraulic crack range becomes wider than by using only conventional methods. In coal seams it is possible to increase permeability which makes gas drainage to be more effective. It is because water shockwaves and bubble pulsations induced by the explosion, cause a high strain rate in the rock mass surrounding the bore hole. When hydraulic fracturing is used, a micro seismic event takes place. This is why micro seismic technologies are used to monitor the range of hydraulic fracturing process. This article is only mentioning the issue which in the Author opinion, deserves more attention.","PeriodicalId":43629,"journal":{"name":"Mining Science","volume":"92 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79430625","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}
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