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Two new barrier pillar design methods for longwall mining 长壁采矿障碍矿柱设计的两种新方法
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90600-H
A. Majdi , F.P. Hassani , P. Cain
{"title":"Two new barrier pillar design methods for longwall mining","authors":"A. Majdi ,&nbsp;F.P. Hassani ,&nbsp;P. Cain","doi":"10.1016/0167-9031(91)90600-H","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90600-H","url":null,"abstract":"<div><p>The current barrier pillar design criteria in longwall mining are described with the aim at developing new design criteria for barrier pillars. Two analytical approaches have been developed and are presented. The results are compared with the in situ data obtained from monitoring the performance of 26 gateroads (coalface access tunnels) in mines of the Cape Breton Coalfield. Finally, the results of these approaches are compared with existing barrier pillar design criteria in longwall mining.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 323-336"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90600-H","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726077","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: 41
Distribution of gas pressure in a radial flow field 径向流场中气体压力的分布
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90861-6
Sun Peide
{"title":"Distribution of gas pressure in a radial flow field","authors":"Sun Peide","doi":"10.1016/0167-9031(91)90861-6","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90861-6","url":null,"abstract":"<div><p>It is still a difficult problem to find the analytical solutions for the gas flow equation, the nonlinear partial differential equation of the radial flow field in the coal seam. The approximate analytical solutions, with variable substitution and proper simplification, that is, the distribution expressions of gas pressure in a radial flow field are developed. The analytical formulas for gas drainage in the coal seam are presented. The numerical calculation with computers demonstrates that the new analytical formulas are accurate and easy to use for the design of a gas drainage system.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 409-415"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90861-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91609762","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
Comparison of longitudinal and transverse cutting heads on a dynamic and kinematic basis 在动态和运动学的基础上对纵向和横向切割头进行比较
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90368-M
O.Z. Hekimoglu
{"title":"Comparison of longitudinal and transverse cutting heads on a dynamic and kinematic basis","authors":"O.Z. Hekimoglu","doi":"10.1016/0167-9031(91)90368-M","DOIUrl":"10.1016/0167-9031(91)90368-M","url":null,"abstract":"<div><p>Some dynamic and kinematic characteristics of longitudinal and transverse cutting heads on boom tunnelling machines are described and compared. A dynamic and kinematic analysis was carried out for the both cutting head types under the same operational and design conditions. The results were compared with those of long term in situ trials of longitudinal cutting heads.</p><p>The cutting head design was found to have a significant effect on the performance of both cutting head types. The resultant boom force reaction was found to act perpendicular to the boom axis for a longitudinal head, whilst it tended to act parallel to the boom axis for a transverse head. The change in the magnitude of the resultant boom reaction was also seen to be relatively high for the transverse heads during transitions from arcing to lifting. It was further emphasized that the consistency in the produce size of a transverse head is likely to be higher in arcing than in lifting.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 243-255"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90368-M","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88665849","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: 10
A review of the Brazilian test for rock tensile strength determination. Part I: calculation formula 巴西岩石抗拉强度测定试验综述。第一部分:计算公式
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)91006-4
G.E. Andreev
{"title":"A review of the Brazilian test for rock tensile strength determination. Part I: calculation formula","authors":"G.E. Andreev","doi":"10.1016/0167-9031(91)91006-4","DOIUrl":"https://doi.org/10.1016/0167-9031(91)91006-4","url":null,"abstract":"<div><p>There is an opinion that the Brazilian test is not valid for materials where the ratio, <em>n = R</em><sub>c</sub>/<em>R</em><sub>t</sub>, between compressive strength, <em>R</em><sub>c</sub>, and tensile strength, <em>R</em><sub>t</sub>, is low. This article supports the view that the Brazilian test is valid for materials which exhibit brittle failure. The continual <em>δ</em> model and <em>β</em> model created on the basis of the effective tensile stress are proposed. According to the latter model: <em>R</em><sub>t</sub> = (2<em>P/πDL</em>)(<em>n</em> + 3/<em>n</em>), of which experimental proofs are given.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 445-456"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)91006-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726065","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: 95
Sill mat evaluation using centrifuge models 用离心机模型评价储层
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90542-K
R.J. Mitchell
{"title":"Sill mat evaluation using centrifuge models","authors":"R.J. Mitchell","doi":"10.1016/0167-9031(91)90542-K","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90542-K","url":null,"abstract":"<div><p>Sill mats are structural elements used in cut-and-fill mining of low to moderate width, steeply dipping ore zones in order that ore sill pillars may be mined out. Traditional sill mat design appears to have developed from experience and timber mats are often used to ensure stability. Centrifuge model studies are combined with equilibrium analyses in this paper to provide insight into sill mat behaviour. Physical model testing provides particular insight into potential modes of failure under complex boundary stress or displacement conditions. The results show that sill mat reinforcing might be considered as an alternate to timber mats in cases where plain cemented sill mats would not be expected to be suitable.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 301-313"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90542-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726075","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: 29
Dynamic roof movement in intersections during pillar extraction 矿柱回采过程中交叉口顶板动态移动
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90658-Y
André Vervoort, Garry Prohaska
{"title":"Dynamic roof movement in intersections during pillar extraction","authors":"André Vervoort,&nbsp;Garry Prohaska","doi":"10.1016/0167-9031(91)90658-Y","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90658-Y","url":null,"abstract":"<div><p>During pillar extraction, an increase in strata movement occurs. To accomodate this increase, supplementary support is often required in intersections of pillar extraction panels. This paper summarizes an investigation to determine an optimum support system. It shows that the installation of cable bolts and cable trusses as supplementary support improves the roof stability by reducing the roof deflection. The roof deflection was measured underground and the results obtained formed the basis for three-dimensional numerical simulations.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 351-357"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90658-Y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726076","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
A review of the Brazilian test for rock tensile strength determination. Part II: contact conditions 巴西岩石抗拉强度测定试验综述。第二部分:接触条件
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)91035-G
G.E. Andreev
{"title":"A review of the Brazilian test for rock tensile strength determination. Part II: contact conditions","authors":"G.E. Andreev","doi":"10.1016/0167-9031(91)91035-G","DOIUrl":"https://doi.org/10.1016/0167-9031(91)91035-G","url":null,"abstract":"<div><p>The idea of transmission of the diametrical load on a specimen, by both stiff and soft loading devices, is based on theoretical and experimental investigations. A failure in the contact area of the specimen is excluded if its modulus of elasticity differs considerably from the modulus of elasticity of the loading device, regardless of the trend.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 457-465"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)91035-G","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726068","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: 66
Computer simulation of transient climatic conditions in underground airways 地下气道瞬态气候条件的计算机模拟
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90803-K
T.R. Roy, B. Singh
{"title":"Computer simulation of transient climatic conditions in underground airways","authors":"T.R. Roy,&nbsp;B. Singh","doi":"10.1016/0167-9031(91)90803-K","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90803-K","url":null,"abstract":"<div><p>A computer program <span>clima</span> was developed to predict the time-dependent climatic change in an underground airway. The dry and wet surface temperatures of the airway used in the program were calculated following a finite difference scheme. Instead of using uniform air current temperatures in the finite difference formulations, as practised normally, the air current temperatures were regularly re-evaluated after suitable time spans so as to simulate a real situation and for improved results. The flowchart of the program is also given.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 395-402"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90803-K","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726073","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: 10
Study of shield support characteristics and their influence on the roof behaviour in coal longwalls 煤长壁盾构支护特性及其对顶板特性的影响研究
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90571-S
André Vervoort
{"title":"Study of shield support characteristics and their influence on the roof behaviour in coal longwalls","authors":"André Vervoort","doi":"10.1016/0167-9031(91)90571-S","DOIUrl":"10.1016/0167-9031(91)90571-S","url":null,"abstract":"<div><p>To ensure good roof control in coal longwalls, the correct handling of a shield support is of equal importance with the correct design of the support. This paper summarizes an underground survey of the performance of shield supports. The distributions of geometrical parameters as well as of parameters of support resistance were characterized by a wide scatter in the data. The effect of these parameters on the frequency of falls of ground showed a significant correlation.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 315-322"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90571-S","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75394143","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: 1
Experimental investigations of the flow of water and some water solutions in sandstones 砂岩中水流及某些水溶液的实验研究
Mining Science and Technology Pub Date : 1991-12-01 Epub Date: 2004-11-29 DOI: 10.1016/0167-9031(91)90919-4
R. Skawińsk, J. Żółcińska, L. Dyrga
{"title":"Experimental investigations of the flow of water and some water solutions in sandstones","authors":"R. Skawińsk,&nbsp;J. Żółcińska,&nbsp;L. Dyrga","doi":"10.1016/0167-9031(91)90919-4","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90919-4","url":null,"abstract":"<div><p>Clay present in sandstones is sensitive to the water saturation and to the kind of ions and their concentration in the flowing water. The reaction of the rock upon these factors manifests itself as an internal swelling or internal shrinkage of the rock and the resulting permeability changes in the water flow.</p><p>This paper describes experimental investigations into permeability changes occuring in the flow of water and water solutions of salt of various concentrations in sandstones collected from oil reservoirs and from hard coal mines. Experiments with the flow of water and of solutions in coal are also mentioned.</p><p>Increasing the water content in sandstones from an air-dry condition to the state of full saturation results in rapid (within hours or days) internal swelling of the rock leading to a decrease in permeability which can achieve two or three orders of magnitude. In the flows of water solutions of salt in sandstones it is possible to produce changes in permeability (increase or decrease) even by two orders of magnitude by means of changing the concentration or the ion composition of the solution.</p><p>The flow of a diluted solution of calcium hydroxide proved to be very effective in increasing permeability. Big effects were obtained even when using low concentrations of this solution, which suggests the possibility of a practical application for the observed phenomena.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 423-432"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-9031(91)90919-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91761092","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
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