Mining Science and Technology最新文献_第3页

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 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, J. Żółcińska, 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

On the state of methane in coal seams 论煤层中甲烷的状态

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90832-W

I.L. Ettinger , V.V. Serpinsky

引用次数: 9

The area of influence of groundwater pumping: determination by geostatistical method in a case study 抽取地下水的影响范围:在个案研究中用地质统计学方法确定

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90745-X

S. Majumder, N.S. Sundaram

引用次数: 2

An overview of condition monitoring and an expert system for longwall mining machinery 长壁矿山机械状态监测及专家系统研究综述

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90455-L

A. Basu , Li Yuejin , R.N. Singh

引用次数: 9

Theoretical and practical aspects of circumferential pick spacing on boom tunnelling machine cutting heads 臂架掘进机切削头周向截齿间距的理论与实践

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90397-U

O.Z. Hekimoglu , R.J. Fowell

引用次数: 24

Solder properties for soldering solid pseudo alloy plates of monoblock bit obtained through testing for percussive drilling 通过冲击钻井试验，获得了焊接单块钻头固体伪合金板的焊料性能

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90513-C

P. Trifunović

引用次数: 0

Quality comparison of mining equipment based on their technical characteristics 基于技术特点的矿山设备质量比较

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90484-T

V. Čokorilo, M. MiliČić

引用次数: 2

An adiabatic apparatus to establish the spontaneous combustion propensity of coal 一种测定煤自燃倾向的绝热装置

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90890-O

M.J. Gouws , G.J. Gibbon , L. Wade , H.R. Phillips

引用次数: 21

Analysis of symmetric contact charge action in breaking rock boulders 岩石破碎过程中对称接触电荷作用分析

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90977-K

Wei Wu

引用次数: 0

Size distribution of airborne dust produced by the drilling process 钻孔过程中产生的空气粉尘的粒径分布

Mining Science and Technology Pub Date : 1991-12-01 DOI: 10.1016/0167-9031(91)90774-7

Tevfik Güyagüler

{"title":"Size distribution of airborne dust produced by the drilling process","authors":"Tevfik Güyagüler","doi":"10.1016/0167-9031(91)90774-7","DOIUrl":"https://doi.org/10.1016/0167-9031(91)90774-7","url":null,"abstract":"<div><p>The aim of this work was to investigate the size distribution of dust particles produced during the drilling process. It has already been proved that the degree of harmful effect of inhaled dust is closely related with dust particle size. The dust data needed to determine size distribution were obtained by sampling dusty atmospheres during the drilling process with a short-period thermal precipitator.</p><p>Drilling and dust sampling processes were carried out in a model gallery which simulated the working face. Rock samples used in drilling were brought from the various galleries of Kozlu mines, Zonguldak Colliery. The tests were carried on four types of sandstones, two types of shales and conglomerate, in total seven types of sedimentary rock. For each type of rock six dust samples were taken and evaluated.</p><p>It is concluded that the frequency distribution of airborne dust particles produced by each rock type is approximately lognormal. The geometric mean values of dust particles for sandstone, shales and conglomerate are found to be 0.89, 0.95 and 0.83 μm respectively. In other words, the mean value of dust particles produced during the drilling operation of different rocks are around 1 μm in diameter, which has the maximum probability to be retained in the lungs during respiration.</p></div>","PeriodicalId":100929,"journal":{"name":"Mining Science and Technology","volume":"13 3","pages":"Pages 389-394"},"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)90774-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91726071","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