Archives of Mining Sciences最新文献_第4页

Convergence monitoring as a basis for numerical analysis of changes of rock-mass quality and Hoek-Brown failure criterion parameters due to longwall excavation 基于收敛监测的长壁开挖岩体质量和Hoek-Brown破坏准则参数变化数值分析

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2019.126274

P. Małkowski, Ł. Ostrowski

{"title":"Convergence monitoring as a basis for numerical analysis of changes of rock-mass quality and Hoek-Brown failure criterion parameters due to longwall excavation","authors":"P. Małkowski, Ł. Ostrowski","doi":"10.24425/ams.2019.126274","DOIUrl":"https://doi.org/10.24425/ams.2019.126274","url":null,"abstract":"In the longwall exploitation system, the main gates are subject of the most intensive movements of the rock mass, where the proximity of the excavation front is a key factor. The paper presents the results of a research on the constants mb and s of Hoek-Brown failure criterion for the rocks surrounding the gallery: shale, sandy shale, coal and medium-grained sandstone, in relation to the distance to longwall face. The research comprised numerical modeling based on convergence monitoring records. The convergence measurements were carried out on three stations in a selected maingate in a coal mine from Upper Silesia Coal Basin near Jastrz ę bie-Zdrój, concurrently with changing distance to the longwall face. The measu- red were the width, the height and the heave of the floor of the gate. The measurements showed that the convergence at the longwall-maingate crossing was 1.5-3 times greater than in the locations much further from the longwall face. It was demonstrated that this effect was due to continuously changing properties of the rock-mass surrounding the gallery that can be expressed as decreasing empirical parameters mb i s of Hoek-Brown’s criterion. These parameters are decreasing exponentially together with the distance to the longwall face The consistency between the theoretical and factual curve varies between 70% to 98%. The change of each of the parameters can be described by general equation P = a ·exp(– b · d ), where a , b are constants, and d is the distance to the excavation face. The authors highlight that during the me- asurements period the horizontal stress was 1.45 to 1.61 times greater than the concurrent vertical stress. The so high horizontal stress causes heave of unsupported gallery floor which is commonly observed in the mines in Silesia.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41911794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 18

Radon Measurements in Groundwater Mines in La Palma and El Hierro, Canary Islands (Spain) 加那利群岛La Palma和El Hierro地下水矿的氡测量（西班牙）

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.135182

引用次数: 0

Failure Characteristics and Strength Model of Composite Rock Samples in Contact Zone Under Compression 接触区复合岩石试样压缩破坏特征及强度模型

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.133197

Qihu Wang, Jie Wang, Ye Yicheng, Wei Jiang, N. Yao

{"title":"Failure Characteristics and Strength Model of Composite Rock Samples in Contact Zone Under Compression","authors":"Qihu Wang, Jie Wang, Ye Yicheng, Wei Jiang, N. Yao","doi":"10.24425/ams.2020.133197","DOIUrl":"https://doi.org/10.24425/ams.2020.133197","url":null,"abstract":"Significant differences in the physical and mechanical properties exist between the rock masses on two sides of an ore-rock contact zone, which the production tunnels of an underground mine must pass through. Compared with a single rock mass, the mechanical behavior of the contact zone composite rock comprising two types of rock is more complex. In order to predict the overall strength of the composite rock with different contact angles, iron ore-marble composite rock sample uniaxial compression tests were conducted. The results showed that composite rock samples with different contact angles failed in two different modes under compression. The strengths of the composite rock samples were lower than those of both the pure iron ore samples and pure marble samples, and were also related to the contact angle. According to the stress-strain relationship of the contact surface in the composite rock sample, there were constraint stresses on the contact surface between the two types of rock medium in the composite rock samples. This stress state could reveal the effect of the constraint stress in the composite rock samples with different contact angles on their strengths. Based on the Mohr-Coulomb criterion, a strength model of the composite rock considering the constraint stress on the contact surface was constructed, which could provide a theoretical basis for stability researches and designs of contact zone tunnels.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43753416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The Use of Limestone in Historic Road Surfaces – a Case Study 石灰石在历史路面上的应用——一个案例研究

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2022.142411

J. Hydzik-Wiśniewska, E. Hycnar

{"title":"The Use of Limestone in Historic Road Surfaces – a Case Study","authors":"J. Hydzik-Wiśniewska, E. Hycnar","doi":"10.24425/ams.2022.142411","DOIUrl":"https://doi.org/10.24425/ams.2022.142411","url":null,"abstract":": the article presents the problem of selecting the correct type of limestone for producing paving stones used to renovate the surface of Mariacki square in krakow. due to using up local limestone deposits, imported limestones began to be used. the first one was a turkish limestone with the trade name lotus beige. despite substantial physical and mechanical parameters (compressive strength 134 MPa, water absorption 0.26%), after several years of use, the paving stone cracked and, as a result, fell apart into smaller fragments. Hauteville limestone from France has been selected for the following reconstruc - tion of the surface. this limestone in the air-dry state was characterised by even higher parameters, i.e. compressive strength of 157 MPa, flexural strength at 16.9 MPa, bohme abrasion test at 15275 mm 3 , and water absorption at 0.23%. the tests also showed absolute frost resistance and high resistance to thermal shock. Unfortunately, after several years of using the surface of Mariacki square, cracks and flaking of the rock material have been observed in terms of some paving stones. these cracks appeared within the so-called stylolite seams, which are a natural feature of limestone. despite a very strict selection of materials, unfortunately, problems with the surface’s durability could not be avoided.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44840090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Underground Mine Gas Explosion Accidents and Prevention Techniques – An overview 煤矿井下瓦斯爆炸事故及防治技术综述

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2021.137463

W. Song, Jianwei Cheng, Wenhe Wang, Yi Qin, Zui Wang, M. Borowski, Yue Wang, P. Tukkaraja

{"title":"Underground Mine Gas Explosion Accidents and Prevention Techniques – An overview","authors":"W. Song, Jianwei Cheng, Wenhe Wang, Yi Qin, Zui Wang, M. Borowski, Yue Wang, P. Tukkaraja","doi":"10.24425/ams.2021.137463","DOIUrl":"https://doi.org/10.24425/ams.2021.137463","url":null,"abstract":"Mine gas explosions present a serious safety threat in the worldwide coal mining industry. it has been considered the no.1 killer for underground coal mining workers. the formation of an explosive atmosphere involves various factors. Due to complicated stratified geology and the coal production process, geological conditions and coal production process reasons and particular working sections underground present a high risk of an explosion that would most likely cause casualties and property loss. in this study, the basic conditions, propagation law and hazards analysis of gas explosions are reviewed, followed by a review of the typical locations where an explosion would occur. Finally, current technologies used in the mining industry for preventing gas explosions and suppressing the associated dangers were studied. Preventive gas explosion technologies mainly include gas drainage, gas accumulation prevention and gas and fire source monitoring technologies. the technologies often used to control or mitigate gas explosion hazards are usually divided into active and passive, and the advantages and disadvantages of each method are discussed and compared. this paper aims to summarise the latest technologies for controlling and suppressing gas explosion and guides mining engineers to design risk mitigation strategies.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45049188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Assessing Geological and Mining Condition Nuisance and its Impact on the Cost of Exploitation in Hard Coal Mines with the Use of a Multi-Criterion Method 用多准则法评价硬煤地质采矿条件妨害及其对开采成本的影响

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/123690

E. Sobczyk, M. Kopacz

引用次数: 0

Study on the Three-Phase Flow of the Water Transfer Export Elbow of Natural Gas Hydrate 天然气水合物外输弯管三相流研究

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2022.141456

Wei Chen, Haifeng Xu, Bo Wu, Fang-qiong Yang

{"title":"Study on the Three-Phase Flow of the Water Transfer Export Elbow of Natural Gas Hydrate","authors":"Wei Chen, Haifeng Xu, Bo Wu, Fang-qiong Yang","doi":"10.24425/ams.2022.141456","DOIUrl":"https://doi.org/10.24425/ams.2022.141456","url":null,"abstract":"The Euler multiphase flow and population equilibrium model were used to simulate the three-phase flow field in the bubble expansion stage of the outlet curved pipe section. The influence of the ratio of the bending diameter and the volume fraction of the gas phase on the pressure loss is revealed, and the safety range of the optimum bending diameter ratio and the volume fraction of the outlet gas phase is determined. The results show that the three-phase flow in the tube is more uniformly distributed in the vertical stage, and when the pipe is curved, the liquid-phase close to the pipe wall gathers along the pipe flank to the outside of the pipe, the solid phase is transferred along the pipe flank to the inside of the pipe, and the gas phase shrinks along the pipe flank to the inner centre. The maximum speed of each phase of the three-phase flow in the elbow is at the wall of the tube from 45° to 60° inside the elbow, and the distribution law along the axial direction of the pipe is about the same as the distribution law of volume fraction. The pressure loss of the elbow decreases with the increase of the bend diameter ratio, when the bend diameter ratio increases to 6, the pressure loss of the pipe decreases sharply, and the pressure loss decreases slowly with the increase of the bend diameter ratio. When the gas phase volume score in the elbow reaches 70%, there will be an obvious wall separation phenomenon, to keep the system in a stable working state and prevent blowout, the gas phase volume score should be controlled within 60%.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46849548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Overlying Sand-Inrushing Mechanism and Associated Control Technology for Longwall Mining in Shallow Buried Coal Seams with the Soft Surrounding Rock 软围岩浅埋煤层长壁开采上覆突砂机理及相关控制技术

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2022.143681

Fangtian Wang, Dongliang Shao, Cun Zhang, Chenkai Zhang, Ziyu Song

引用次数: 0

Revalorization of Mineral Coal, to Obtain Carbonaceous Materials with High Added Value 矿物煤的再气化，获得高附加值的碳质材料

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/ams.2020.133189

J. Vidal-Lombas, M. álvarez-Fernández, M. Casado-Sulé, M. Prendes-Gero, F. SUÁREZ-DOMÍNGUEZ

{"title":"Revalorization of Mineral Coal, to Obtain Carbonaceous Materials with High Added Value","authors":"J. Vidal-Lombas, M. álvarez-Fernández, M. Casado-Sulé, M. Prendes-Gero, F. SUÁREZ-DOMÍNGUEZ","doi":"10.24425/ams.2020.133189","DOIUrl":"https://doi.org/10.24425/ams.2020.133189","url":null,"abstract":"This paper shows the possibility that the mineral coal existing in the mining basins of northern Spain have a high added value. This would facilitate its future use in different fields such as new materials, nanotechnology, energy use in situ , coal bed methane, enhanced coal bed methane and coalmine methane. An analytical study of mineral coal samples is carried out. The samples come from two deposits located in coal basins of the Cantabrian Mountains. The duly prepared samples are subjected to an activation process. Within this transformation, different treatments are applied to different sub-samples. Some of the sub-samples suffer a previous demineralization by successive attacks with acids, followed by oxidation and pyrolysis. Finally, all of them are activated with CO 2 and H 2 O (steam) . The carbonaceous products resulting from each treatment are characterised. The results show that all the pre-treatments used were positive for the textural development of the materials. Likewise, proper management of the processes and of the different operating variables allows the procurement of carbo- naceous materials with a “tailor-made” structural development of the coal type. This material receives the name “activated” and can be employed in specific processes.","PeriodicalId":55468,"journal":{"name":"Archives of Mining Sciences","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2023-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41357871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Gravity Flow Model of Fragmented Rocks in Longitudinal Sublevel Caving of Inclined Medium-Thick Ore Bodies 倾斜中厚矿体纵向分段崩落破碎岩体重力流模型

IF 1.2 4区工程技术

Archives of Mining Sciences Pub Date : 2023-07-20 DOI: 10.24425/AMS.2019.129367

Xiufeng Zhang, Ganqiang Tao, Zhonghua Zhu

引用次数: 3