Mining Science and Technology (China)最新文献_第3页

Mechanism and practice of rock control in deep large span cut holes 深大跨度切孔岩石控制机理与实践

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.06.020

Li Chong , Xu Jinhai , Fu Chunsheng , Wu Rui , Ma Qianqian

{"title":"Mechanism and practice of rock control in deep large span cut holes","authors":"Li Chong , Xu Jinhai , Fu Chunsheng , Wu Rui , Ma Qianqian","doi":"10.1016/j.mstc.2011.06.020","DOIUrl":"10.1016/j.mstc.2011.06.020","url":null,"abstract":"<div><p>Deep large span cut holes are difficult to stabilize. The 7801 cut hole in the Lu’an Wuyang Mine was used as this project’s background. The main factors affecting large span cut hole stability are analyzed. Pre-stressed bolting theory was used to design a roof control method for a large span roadway. By reducing the span and applying equal strength coordinated supports the rock could be stabilized. The control principles and methods are given herein along with the analysis. A double micro arch cross section roadway is defined and its use in solving the current problem is described. Beam arch theory was used to build a model of the double micro arch cross section roadway. A support reverse force model for the arch foot intersection was also derived. A support method based upon reducing the width of the large span in the cut hole is presented. These results show that the reduced span of the roadway roof plus the use of cable anchors and single supports gives an effective way to control the large span cut hole. On site monitoring showed that the reduced span support from the double micro arch cross section roadway design had a significant effect. The roadway surface displacement was small and harmful deformation of the cut hole was effectively controlled. This will ensure its long term stability.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 6","pages":"Pages 891-896"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.06.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81837005","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

Effects of strain rates on mechanical properties of limestone under high temperature 高温下应变速率对石灰石力学性能的影响

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.05.032

Tang Furong , Mao Xianbiao , Zhang Lianying , Yin Huiguang , Li Yan

{"title":"Effects of strain rates on mechanical properties of limestone under high temperature","authors":"Tang Furong , Mao Xianbiao , Zhang Lianying , Yin Huiguang , Li Yan","doi":"10.1016/j.mstc.2011.05.032","DOIUrl":"10.1016/j.mstc.2011.05.032","url":null,"abstract":"<div><p>The experimental tests for limestone specimens at 700°C in uniaxial compression were carried out to investigate the mechanical effects of loading rates on limestone by using a MTS810 rock mechanics servo-controlled testing system considering the loading rate as a variable. The mechanical properties of limestone such as the stress–strain curve, variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the strain rates ranging from 1.1×10<sup>−5</sup> to 1.1×10<sup>−1</sup>     s<sup>−1</sup> at 700°C as well as a downward trend was shown from 1.1×10<sup>−4</sup> to 1.1×10<sup>−1</sup>     s<sup>−1</sup>, however, there was no obvious changes shown for the peak strain of limestone from 1.1×10<sup>−4</sup> to 1.1×10<sup>−1</sup> <!-->s<sup>−1</sup>. These results can provide valuable references for the rock blasting effect and design of mine.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 6","pages":"Pages 857-861"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.05.032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76751329","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: 22

Optimization of shearer sliding boots by plasma cladding with Cr4MnTi 等离子熔覆Cr4MnTi优化采煤机滑靴

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.06.021

Liu Hongtao , Wang Luping , Ge Shirong , Cao Shoufan , Jin Jing , Gao Jiping

引用次数: 3

Laser triangulation measurement of the level in a coal silo 激光三角测量法测量煤仓的液位

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.05.029

Sun Jiping , Jiang Jing

引用次数: 6

Ore petrography of low-grade siliceous manganese ores from the Bonai-Keonjhar belt, Orissa, India: The influence of mineral-fabric on their beneficiation 印度奥里萨邦Bonai-Keonjhar带低品位硅质锰矿的矿石岩石学:矿物结构对其选矿的影响

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.06.025

Mishra Subrat, Mohapatra Birendra Kumar, Dash Nilima, Rao Danda Srinivas

{"title":"Ore petrography of low-grade siliceous manganese ores from the Bonai-Keonjhar belt, Orissa, India: The influence of mineral-fabric on their beneficiation","authors":"Mishra Subrat, Mohapatra Birendra Kumar, Dash Nilima, Rao Danda Srinivas","doi":"10.1016/j.mstc.2011.06.025","DOIUrl":"10.1016/j.mstc.2011.06.025","url":null,"abstract":"<div><p>Low grade siliceous manganese ores from the iron ore group of the Bonai-Keonjhar belt, Orissa, India are found mostly in shear zones. The ore characteristics of siliceous manganese ore samples from three different mines, viz. the Shankar (Barbil OMC lease hold area), the Sone-Patuli (Patmunda, OMM lease hold area), and the Musaghar (Roida, OMDC lease hold area), were studied. These siliceous manganese ores are of three types, respectively: (i) spongy-granular; (ii) massive-mosaic; and (iii) hard-mylonitized. The spongy-granular type contains granular, saccharoidal quartz and the major manganese mineral present is pyrolusite. The second type contains well crystallized quartz and cryptomelane, while the third has cherty, fine grained quartz (mylonite) along with romanechite. All three ores were subjected to physical beneficiation under similar conditions. Both gravity and magnetic separation techniques were employed. The mineral-fabric of the ores has been correlated to the extent of their beneficiation using these physical techniques. Of these three ores only the spongy-granular type responded well to upgrading. The feed with 22% Mn content could be upgraded to 44% with a 28% yield and a 49% recovery. The good response to beneficiation of the spongy-granular sample could be due to the large euhedral crystals of pyrolusite and the friable nature of the saccharoidal quartz. This study reveals the influence of mineral-fabric on beneficiation of low grade ore, siliceous Mn ore in particular.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 6","pages":"Pages 803-808"},"PeriodicalIF":0.0,"publicationDate":"2011-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.06.025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82457139","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 routing and positioning algorithm based on a K-barrier for use in an underground wireless sensor network 一种用于地下无线传感器网络的基于k屏障的路由和定位算法

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.04.003

Wang Ke, Wang Qianping, Jiang Dong, Xu Qin

引用次数: 8

Gradient based restoration of coal mine images obtained by underground wireless transmissions 基于梯度的煤矿井下无线传输图像恢复

Mining Science and Technology (China) Pub Date : 2011-11-01 DOI: 10.1016/j.mstc.2011.11.001

Lu Zhaolin , Qian Jiansheng , Li Leida

引用次数: 1

Application of micro-seismic facies to coal bed methane exploration 微地震相在煤层气勘探中的应用

Mining Science and Technology (China) Pub Date : 2011-09-01 DOI: 10.1016/j.mstc.2011.04.001

Li Donghui , Dong Shouhua , Zhang Cong , Deng Shuaiqi , Li Shujie

引用次数: 2

Overburden failure and the prevention of water and sand inrush during coal mining under thin bedrock 薄基岩下覆岩破坏与突水涌砂防治

Mining Science and Technology (China) Pub Date : 2011-09-01 DOI: 10.1016/j.mstc.2011.04.002

Yang Weifeng, Xia Xiaohong, Zhao Guorong, Ji Yubin, Shen Dingyi

{"title":"Overburden failure and the prevention of water and sand inrush during coal mining under thin bedrock","authors":"Yang Weifeng, Xia Xiaohong, Zhao Guorong, Ji Yubin, Shen Dingyi","doi":"10.1016/j.mstc.2011.04.002","DOIUrl":"10.1016/j.mstc.2011.04.002","url":null,"abstract":"<div><p>Coal mining under thin bedrock or thick unconsolidated soil layers brings mining problems related to these special geological conditions. The meaning of the term “thin bedrock” is defined through the thickness statistics of the coal seam and the bedrock layer. The coal-bearing strata having thick, unconsolidated aquifers and thin bedrock located at the Taiping Coal Mine in Shandong province were taken as a geological prototype for subsequent study. The geological, hydro-geological and engineering characteristics of the thin bedrock were analyzed. An engineering geological model was than established. Overburden failure and the development of “Three Zones” were studied by physical model tests. The rupture pattern and rock failure were analyzed for mining conditions under thin bedrock. The height of the caving zone and the freely flowing water fractured zone of different mining thicknesses were separately calculated. The results show that a mining thickness greater than 3.5m causes the height of the freely flowing water fractured zone to be sufficient to touch the weathered zone and the bottom of the Quaternary system aquifer, to various degrees. This, then, would lead to water and sand inrush into the working face. Measures to prevent water and sand flow inrush disasters by eliminating the power source are put foreword. A field dewatering scheme was designed and observational data were obtained. The dewatering project had an obvious effect and the water level at working face number 8309 dropped to a safe level. The average draw down of the groundwater was observed to be 7.86m. This showed that the dewatering project played a role in decreasing the hydraulic pressure and ensuring safety mining.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 733-736"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86005734","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: 16

Effects of coal prices on merchandise prices in China 煤炭价格对中国商品价格的影响

Mining Science and Technology (China) Pub Date : 2011-09-01 DOI: 10.1016/j.mstc.2011.10.008

Ding Zhihua , Zhou Meihua , Liu Yan

{"title":"Effects of coal prices on merchandise prices in China","authors":"Ding Zhihua , Zhou Meihua , Liu Yan","doi":"10.1016/j.mstc.2011.10.008","DOIUrl":"https://doi.org/10.1016/j.mstc.2011.10.008","url":null,"abstract":"<div><p>Coal is the principal form of energy used in China. Hence, coal price variations are expected to have some influence on merchandise prices. Monthly data from January, 2002, to October, 2010, were used to construct a varying-parameter state space model, and an error correction model, to estimate the influence of coal prices on Chinese merchandise prices. The time lag and the dynamic relationship were determined from the data. A long term equilibrium relationship between coal price and the PPI, and the CPI, can be observed. The long term influence of coal price fluctuations on the PPI is 0.263%. The corresponding value for the CPI is 0.157%. The PPI shows an influence from coal price change in the first period of observation: by eight periods the influence is obvious, after which it diminishes. The effect of coal price change on the CPI is rather weak and has no long term memory. Analysis of variance shows a similar situation. The elasticity coefficient of coal prices on the CPI, or the PPI, fluctuates over the 2002–2004 period. From 2002 to 2007 the influence elasticity on the CPI declined and subsequently levelled off after 2009.</p></div>","PeriodicalId":100930,"journal":{"name":"Mining Science and Technology (China)","volume":"21 5","pages":"Pages 651-654"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.mstc.2011.10.008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91699321","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