Rudarsko-Geolosko-Naftni Zbornik最新文献_第6页

The efficiency of a small sized hand-made shaped charge 手工制作的小型聚能装药的效率

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.2.7

V. Bohanek, M. Dobrilović, B. Stimac Tumara, S. Stankovic

{"title":"The efficiency of a small sized hand-made shaped charge","authors":"V. Bohanek, M. Dobrilović, B. Stimac Tumara, S. Stankovic","doi":"10.17794/rgn.2022.2.7","DOIUrl":"https://doi.org/10.17794/rgn.2022.2.7","url":null,"abstract":"Shaped charges are widely used in many different fields. The two main users of shaped charges are the military, where shaped charges are used as a weapon against armoured targets, and the oil industry, to perforate wells. Very often, shaped charges are the subject of scientific research focused on optimising shaped charge parameters and increasing the efficiency of shaped charges. Considering a significant number of parameters affecting the penetration depth, the optimization of shaped charge parameters is a complex process. This paper describes research on the efficiency of small handmade shaped charges. In this research, two methods are used, the first one involves simulations with numerical software and the second one is site testing. AUTODYN software was used for the numerical simulations. One of the simulations was focused on the shape and velocity of the shaped charge jet and the second on the penetration of the jet into the target material. On-site efficiency of shaped charges at different standoff distances was tested. The experimental result was compared with the AUTODYN simulation result for hand-made shaped charges placed at a distance of 90 mm from the target material. The results of the simulations agree very well with the results of the site tests. Some advantages and disadvantages of each approach are also observed.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68150752","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

SUBSTANTIATING THE PARAMETERS OF QUICKLY ERECTED EXPLOSION-PROOF STOPPING 确定了快速搭建防爆停机的参数

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.4.12

V. Kostenko, O. Zavialova, Yu.P. Novikova, Оlha Bohomaz, Ya. Krupka, T. Kostenko

引用次数: 1

IMPROVING MECHANICAL PROPERTIES OF OIL WELL CEMENT USING POLYPROPYLENE FIBERS AND EVALUATING A NEW LABORATORY METHOD FOR MEASURING THE CASING CEMENT BONDING STRENGTH 利用聚丙烯纤维改善油井水泥的力学性能，评价一种新的测量套管水泥粘结强度的实验室方法

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.5.3

Hani Al Khalaf, Gabriella Federer Kovacsne, Nagham Alhaj Mohammed, F. Remeczki

{"title":"IMPROVING MECHANICAL PROPERTIES OF OIL WELL CEMENT USING POLYPROPYLENE FIBERS AND EVALUATING A NEW LABORATORY METHOD FOR MEASURING THE CASING CEMENT BONDING STRENGTH","authors":"Hani Al Khalaf, Gabriella Federer Kovacsne, Nagham Alhaj Mohammed, F. Remeczki","doi":"10.17794/rgn.2022.5.3","DOIUrl":"https://doi.org/10.17794/rgn.2022.5.3","url":null,"abstract":"The main objective of this study is to enhance the poor performance of oil well cement in terms of mechanical properties by using pure polypropylene fibers. Polypropylene fibers were added in increasing concentrations from 0 to 0.1%, 0.3%, 0.5%, 0.7%, and 0.9% by weight of cement (BWOC). Rheological parameters, density, fluid loss, permeability, porosity, compressive strength, tensile strength, and flexural strength were all tested. A new method for measuring the tensile strength of cement samples in the presence of a casing is also evaluated in this research. In addition, the interfacial bonding shear strength, which represents the strength of cement adhesion to the casing, was measured using a new laboratory procedure. The influence of adding polypropylene fibers on rheology, density, and fluid loss can be ignored, according to the results of the experiments. The permeability and porosity of cement samples increased as the proportion of polypropylene fibers increased, according to the findings. Further, an increase in polypropylene fibers concentration up to 0.3% BWOC led to improving the mechanical properties at different curing times. The bonding strength of the casing cement interface improved with increasing polypropylene fibers concentration up to 0.5% BWOC.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68154262","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

DETERMINING A RESILIENT STOPE BOUNDARY FOR UNDERGROUND MASS MINING PROJECTS 地下大型采矿工程弹性采场边界的确定

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.5.9

Mohammad Shami-Qalandari, M. Rahmanpour, S. M. Mahdi Mirabedi

引用次数: 0

Mechanism of development of coal dust continuous explosion in a network of mine workings 煤矿工作网中煤尘连续爆炸的发展机理

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.1.5

V. Kostenko, O. Zavialova, S. Pozdieiev, T. Kostenko, Viktor Hvozd

{"title":"Mechanism of development of coal dust continuous explosion in a network of mine workings","authors":"V. Kostenko, O. Zavialova, S. Pozdieiev, T. Kostenko, Viktor Hvozd","doi":"10.17794/rgn.2022.1.5","DOIUrl":"https://doi.org/10.17794/rgn.2022.1.5","url":null,"abstract":"The objective of this paper is to reveal the mechanism of creating conditions for the continuous explosion of coal dust by transferring seismic energy to coal dust located along the perimeter of a working. The ANSYS software package was used to model the movement of coal dust particles in the air under the influence of seismic waves caused by the action of an explosion. It was confirmed by modelling that seismic waves, provoked by an explosion, propagate in the rock mass at a higher velocity than the moving explosive front in the air of a working. The qualitative and quantitative behaviour of a layer of coal dust in the process of oscillation of the working walls under the influence of seismic waves during one second was described. The stage of dynamic loosening of the powder is supplemented by the initial period of the mechanism of explosion development, when there are no combustible concentrations of gas or coal traces in the air composition of the mine working before the incident. It is established that under the seismic influence at a distance of about 50 m from the hypocentre of the explosion, a layer of powder-like dispersed coal rises into the air forming a dust cloud, which is the initiator of further continuous development of the explosion spreading in a network of mine workings.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68148736","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

Assessment of excavation intersections’ stability in jointed rock masses using the discontinuum approach 节理岩体开挖交叉口稳定性的非连续介质评价

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.2.12

Anatolii Protosenya, M. Vilner

{"title":"Assessment of excavation intersections’ stability in jointed rock masses using the discontinuum approach","authors":"Anatolii Protosenya, M. Vilner","doi":"10.17794/rgn.2022.2.12","DOIUrl":"https://doi.org/10.17794/rgn.2022.2.12","url":null,"abstract":"During ore deposit development, vast networks of excavations are designed, and the volume of their intersections reaches 10%. At excavation intersections, the prediction of stress-strain state changes is complicated due to spatial geometry, the cross-coupling effect, construction sequence, etc. Mechanical properties of rocks, joint set parameters and the initial stress field also have a significant impact on stress redistribution. According to studies, up to 40% of the total number of failures in excavations occur during their intersections’ construction or reinforcing. Loads on the intersection support in accordance with existing methods are determined as for single excavations with an equivalent span and defined as the width of the larger excavation. The trend towards the intensification of mining, an increase in depth and the complexity of mining and geological conditions also complicate stress state assessment. Existing approaches need to be revised and updated for a more accurate prediction of the stress-strain state at intersections, and should consider spatial geometry, joint sets and initial stress field parameters. In this research, discrete element numerical modelling in 3DEC is done and the results are compared with existing empirical methods. Numerical models are created in a spatial setting and contain explicit representations of joints in the rock mass. Models are verified based on in-situ data, and the obtained results show a difference of up to 2 times in comparison with empirical results. This indicates that the reliability of the existing empirical methods is low, which may lead to stability loss on an intersection. Therefore, empirical methods should be updated. This can be done on the basis of numerical modelling, which shows sufficient convergence with in-situ data.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68149545","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

THE MECHANISM OF THE KAISER EFFECT IN PHYLLITE UNDER INDIRECT TENSILE LOADING 间接拉伸载荷下千粒岩Kaiser效应的机理

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.3.2

Mohammadmahdi Dinmohammadpour, M. Nikkhah, K. Goshtasbi, K. Ahangari

{"title":"THE MECHANISM OF THE KAISER EFFECT IN PHYLLITE UNDER INDIRECT TENSILE LOADING","authors":"Mohammadmahdi Dinmohammadpour, M. Nikkhah, K. Goshtasbi, K. Ahangari","doi":"10.17794/rgn.2022.3.2","DOIUrl":"https://doi.org/10.17794/rgn.2022.3.2","url":null,"abstract":"Determination of in-situ stress serves as an important step in the design and construction of civil and mining projects, among others. Conventional methods of the in-situ stress measurement are time- and cost-intensive. Therefore, the application of low-cost yet rapid methodologies for in-situ stress evaluation has been increasingly regarded by researchers. The Kaiser effect-based acoustic emission method is one of such novel approaches to the in-situ stress evaluation. Not only the point at which the Kaiser effect occurs, but also the mechanism of the Kaiser effect is of paramount importance. In this research, acoustic emission tests were conducted on phyllite rock samples under Brazilian tensile loading to collect a variety of acoustic data, including the amplitude, rise time, count, duration, and energy. Then, the Kaiser effect point was determined using the collected data on acoustic parameters, with its occurrence mechanism investigated. In addition, mathematical transformations were adopted to transform the acoustic signal from the time domain to the frequency domain, where the peak frequency was analyzed. The results of the RA/AF ratio analysis showed that the acoustic emission was sourced from tensile micro-cracks. Moreover, the high level of energy indicated a high intensity of crack formation at the Kaiser effect point. The large number of received hits showed that the count of generated cracks increases abruptly within the range of the Kaiser effect. In addition, the obtained high value of the peak frequency implied that the crack growth rate is high at the Kaiser effect point.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68151465","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

SELECTION OF THE SAFETY RISK ANALYSIS TECHNIQUE MOST COMPATIBLE WITH NATURE, REQUIREMENTS AND RESOURCES OF MINING PROJECTS USING AN INTEGRATED FOLCHI-AHP METHOD 采用综合folchi-ahp方法选择最符合矿山项目性质、需求和资源的安全风险分析技术

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.3.4

Arman Hazrathosseini

引用次数: 1

A STUDY OF BUILDING PERFORMANCE INSPECTION BASED ON A COMBINATION OF SITE-SPECIFIC RESPONSE ANALYSIS AND STRUCTURAL ANALYSIS (A CASE STUDY OF THE LIGHTHOUSE VIEW TOWER IN BENGKULU CITY, INDONESIA) 基于场地响应分析与结构分析相结合的建筑性能检测研究(以印尼明古鲁市灯塔观景塔为例)

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.3.14

L. Z. Mase, Recky Yundrismein, Muhammad Ali Nursalam, Surya Manggala Putra, Aza Shelina, Sahrul Hari Nugroho

{"title":"A STUDY OF BUILDING PERFORMANCE INSPECTION BASED ON A COMBINATION OF SITE-SPECIFIC RESPONSE ANALYSIS AND STRUCTURAL ANALYSIS (A CASE STUDY OF THE LIGHTHOUSE VIEW TOWER IN BENGKULU CITY, INDONESIA)","authors":"L. Z. Mase, Recky Yundrismein, Muhammad Ali Nursalam, Surya Manggala Putra, Aza Shelina, Sahrul Hari Nugroho","doi":"10.17794/rgn.2022.3.14","DOIUrl":"https://doi.org/10.17794/rgn.2022.3.14","url":null,"abstract":"This paper presents the implementation of site-specific analysis in observing the performance of a monumental building in Bengkulu City, Indonesia that is called the Lighthouse View Tower. This building was inaugurated in 2012. So far, it is still necessary to present the issue related to the performance of the building after 10 years. The objective of this study is to observe the performance of the building after the strong earthquake occurred. This study is first conducted by performing a site investigation. The information related to the soil profile; ground motion of the strong earthquake that occurred in Bengkulu City is collected. Furthermore, the site-specific response analysis is conducted on the site where the building stands. The results from site-specific response analysis, i.e. the actual spectral acceleration is obtained. The spectral acceleration is then used as the input parameter for finite element analysis to observe the performance of the building. The main goal of this study is to observe the structure health condition. The results show that during the strong earthquake, the structure of the view tower is still reliable and in good condition. Concern regarding the building maintenance should be emphasized. In general, the method implemented in this study could be used as the method to assess the performance of structures in other areas.","PeriodicalId":44536,"journal":{"name":"Rudarsko-Geolosko-Naftni Zbornik","volume":"1 1","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68152118","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: 4

PREDICTION OF SHEAR WAVE VELOCITY AND MODIFICATION OF CASTAGNA AND CARROLL RELATIONSHIPS IN ONE OF THE IRANIAN OIL FIELDS 伊朗某油田横波速度预测及castagna - carroll关系修正

IF 1.3

Rudarsko-Geolosko-Naftni Zbornik Pub Date : 2022-01-01 DOI: 10.17794/rgn.2022.4.11

M. Mahmoudian, Y. Shiri, A. Vaezian

引用次数: 0