Geo-Technical Mechanics最新文献

{"title":"Geochemical features of nickel in the oils of the Dnipro-Donetsk basin","authors":"","doi":"10.15407/geotm2022.160.005","DOIUrl":"https://doi.org/10.15407/geotm2022.160.005","url":null,"abstract":"","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115353923","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}

{"title":"The forecast of a possibility to re-use preparatory roadway with anchor-frame supports in mines of Western Donbass","authors":"","doi":"10.15407/geotm2021.156.077","DOIUrl":"https://doi.org/10.15407/geotm2021.156.077","url":null,"abstract":"The authors present a solution for an live scientific applied problem on predicting a possibility to re-use a preparatory roadway - a mother entry, which is reinforced with the anchor-frame supports - in the conditions of the mines in Western Donbass. The purpose of the research is to develop a complex of practical recommendations, implementation of which will create the conditions for re-use of the roadway in the conditions of the Western Donbass mines. The solution of this problem is based on the analysis of changes in geomechanical state of the enclosing rocks in the vicinity of the roadway. The obtained analytical data on changes of the rock geomechanical state in the vicinity of the mother entry under typical operating conditions outside zone of longwall influence, in the bearing zone of advancing face of the longwall and behind the face of the longwall show that it is possible to predict a possibility for re-using a roadway during the implementation of routine measures on its maintenance and protection. Identification of the calculated values of the convergence of the roadway roof and soil showed good convergence with the corresponding factual values measured during the mine research. As a result of the research, a set of measures is proposed, implementation of which will create conditions for the roadway reuse. It is also proposed to use a combined timbering of strengthening which will allow to support the roadway edge and to change direction of load on the roadway frame support for providing more yielding and, besides, to reduce roof rock lowering up to 400 mm, preserve geometry of the roadway and prevent deformation of the frame support elements. The proposed recommendations will reduce operating costs of the roadway maintenance, improve safety of its operation and increase economic efficiency of mining district. Keywords: reuse of production, convergence of roofing and soil working, prefab stripping, operational safety.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117114555","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}

{"title":"Solving coupled problems of geomechanics and gas filtration for mining safety ensuring","authors":"","doi":"10.15407/geotm2022.160.106","DOIUrl":"https://doi.org/10.15407/geotm2022.160.106","url":null,"abstract":"","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124486291","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}

{"title":"The procedure for selecting the optimal direction of use of disturbed and technogenic environments","authors":"","doi":"10.15407/geotm2021.159.096","DOIUrl":"https://doi.org/10.15407/geotm2021.159.096","url":null,"abstract":"In the process of open-pit mining, excavations of various sizes are formed on the earth surface: from 1.5 to 8 kilometers long, from 0.4 to 1.5-2.0 km wide. At the same time, agricultural land is very often used for civil construction, as well as for the creation of industrial facilities. This leads to a reduction in land for food production. This problem is especially acute in countries with a rapidly growing population (for example, China) or with an intensively developed mining industry, where lands are significantly disturbed with the formation of technogenic and disturbed geological environments (Ukraine). In this regard, the direction of using the spaces of depleted quarries to create cities, industrial and economic, tourist, and recreational complexes is widely developing in the world. The implemented and proposed in the world practice options for the use of such technogenic and disturbed environments were analyzed. It is shown that the worked-out spaces of mines and quarries can be used for the construction of hotels, residential complexes, cities, industrial enterprises of various industries, power plants, museums, sports complexes and parks. Attention is focused on the presence of social, geomechanical, environmental and other factors, which are necessary to take into account when making a decision on the further use of a technogenic or disturbed environment. To take into account the influence of various factors through a comparison of existing indicators (the potential of the territory) with indicators of possible directions for the use of technogenic and disturbed environments is proposed. A phased analysis is proposed: indicative - to assess the safety of an object, analys of compliance of the object and the adjacent territory, area with the criteria that will determine the direction of its use, taxonomic analysis by the method of hierarchy analysis which evaluates the intensity of criteria, their weight, relative and absolute correction factors for each direction. This the most optimal direction is determines.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122084511","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}

{"title":"Mathematical model for determining the hydraulic characteristics of finely dispersed water mineral suspensions","authors":"","doi":"10.15407/geotm2022.163.155","DOIUrl":"https://doi.org/10.15407/geotm2022.163.155","url":null,"abstract":"Hydraulic characteristics of polydisperse mineral suspensions such as viscosity, concentration, porosity, volume and weight content of solid and liquid phases are necessary to calculate the speed of free or constrained deposition and floating of particles of different composition and size. This speed is the basis for the calculation of hydraulic classifiers and separators for the enrichment of mineral pulps. Determination of hydraulic characteristics requires a lot of experimental measurements, taking into account the different composition of suspensions and operating modes of the devices. The known calculation formulas are empirical and semi-empirical. Theoretical formulas are known only for viscosity, but they are limited by the concentration of the solid phase within 2–5%. The aim of the work is to develop a mathematical model for determining hydraulic characteristics depending on only one measured indicator – the density of the suspension (the volume weight of the sample). This indicator is easily measured in practice, at processing plants it serves to monitor the operating mode of the devices. In this work we use a cellular model of a water suspension consisted of discrete particles, and classical definitions of hydraulic characteristics. Based on this, defining formulas were obtained, an algorithm and a program for calculating characteristics were developed. When using the program, the obtained database allows us to establish approximating dependences: for the weight content of the solid phase θ, porosity ε, concentration β, kinematic viscosity v, density of the suspension ρs in a wide range. These dependencies allow us to calculate the hydraulic characteristics for any zone of the apparatus and different modes using only one simple measurement of pulp density by the weight method. Based on this, for example, it is possible to calculate the speed of constrained deposition and floating of particles and to build a map of the distribution of speeds and the efficiency of gravitational separation of particles. The developed mathematical model, algorithm and calculation program can be used to evaluate the optimal mode, control the stability of the equipment and design new hydraulic devices.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123961806","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}

{"title":"Peculiarities of selecting respiratory protective equipment while working with chemical substances","authors":"","doi":"10.15407/geotm2023.164.091","DOIUrl":"https://doi.org/10.15407/geotm2023.164.091","url":null,"abstract":"A high degree of industrialization and urbanization characterizes the modern working environment. As a result, there is constant contact with various man-made factors (dust, smoke, fog or gas, steam), the concentration of which in the air is higher than the maximum permissible concentrations. The purpose of the paper is to develop a procedure for assessing risks when working with chemicals, which allows substantiating the selection of adequate means of respiratory protective equipment to protect workers when performing production tasks. Methods. To substantiate the selection of the type of respiratory protective equipment when working with chemical substances, a five-step approach to risk assessment is used. The approach is based on classification of chemical substances in terms of “R-phrase”. This means risk factors that arise while working with hazardous substances described in Annex III of the EEC Directive 67/548/EEC. Together with the recommendations of the Approval of the Minimum Requirements for Safety and Health Protection When Employees Use Personal Protective Equipment at the Workplace (NPAOP 0.00-7.17-18), it allows to assess the occupational risk of danger from chemical substances taking into account their toxicity and substantiate the type of respiratory protective equipment. Findings. An approach was developed to substantiate the selection of the type of respiratory protective equipment based on the hazard risk assessment. The correlation between the hazard group according to the “phrases” of a chemical substance and severity of the worker’s health loss was defined. An algorithm for selecting respiratory protective equipment while working with chemical substances was proposed. An example of assessing the impact of sulphur dioxide during the work of miners with a recommendation of the type of respiratory protective equipment was considered. Originality. A correlation between the protection class of the respiratory protective equipment and toxicity of the chemical substance according to the R-phrase was determined. Practical value. An algorithm for selecting respiratory protective equipment to protect workers from chemical substances was proposed. The algorithm is based on five steps making it possible to develop an appropriate form of substantiation for the appropriate type and class of respiratory protective equipment.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130088166","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}

{"title":"The algorithm for determining an optimal system of routes for the mine ventilation and safety engineering masters for the purpose of monitoring aerodynamic parameters of the ventilation network in mines","authors":"","doi":"10.15407/geotm2021.159.079","DOIUrl":"https://doi.org/10.15407/geotm2021.159.079","url":null,"abstract":"Route control of the mine aerogasdynamic parameters is organized in such a way that the obtained information can supplement the information of the unified telecommunication system for dispatch control and automated control of mining machines and technological complexes or another similar system installed in the mine making this information more exact, promptly if possible, without duplications. The route control system is formed from the practical considerations with taking into account the data of the stationary system. Due to the joint functioning of stationary and route control systems with accounting the previous changes of aerogasdynamic parameters, it will be possible to build a predicted trajectory of such a change, which will improve reliability, optimize the control structure and more exactly predict the occurrence of emergency situations. In this article, the authors formulate the main definitions and properties of the route control system and the problem of creating the routes covered the entire mine ventilation network with a given number of control points. An algorithm for constructing a route control system is characterized with taking into account economic and ergonomic conditions, time factor and safety requirements. To solve this problem, it is proposed to use the method of sequential improvement of admissible plan. The essence of the method is that, having received a certain solution (an admissible plan) as an initial approximation, the measures are proposed for improving it till further improvement becomes impossible. The \"improvement\" here means more complete satisfaction of the proposed criterion for minimizing total time of the master travelling for executing his work on the route. Improvement of the admissible plan is carried out by the Monte Carlo method. The possibility of duplication of data obtained from an automated system and by route control is analyzed, and a reduction of the basis of control stations is grounded. The set of routes for monitoring parameters of the ventilation network elements by mine experts chosen in this way will reduce the risk of obtaining incomplete information about its aerogasdynamic state, and cross-monitoring of measurements within the transversal of the bases of two components of the control system will improve reliability and accuracy of the monitoring.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130619911","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}

{"title":"The analytical method for calculating ultimate compression strength of the rock cylindrical samples at pyramidal truncated type of their destruction","authors":"L. Vasyliev, D. Vasyliev, O. Nazarov, M. Malich","doi":"10.15407/geotm2019.149.142","DOIUrl":"https://doi.org/10.15407/geotm2019.149.142","url":null,"abstract":"","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477264","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}

{"title":"Readiness of mine to emergency situations and conception of «zero risk»","authors":"I. Kokoulin","doi":"10.15407/geotm2022.161.127","DOIUrl":"https://doi.org/10.15407/geotm2022.161.127","url":null,"abstract":"","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132563952","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}

{"title":"Justification of the parameters for safe blasting of floor rocks in the roadway driven through the hazardous by outbursts sandstones","authors":"S. Minieiev, O. Kostrytsia, A. Prusova, Roman Skachko, Oleksandr Dykan, Vira Maltseva","doi":"10.15407/geotm2021.159.011","DOIUrl":"https://doi.org/10.15407/geotm2021.159.011","url":null,"abstract":"In this article, the authors provide the substantiation of the parameters for safe floor rocks ripping by drilling-and-blasting technique in the roadway driven through the hazardous by outburst sandstones by way of forming an unloaded (nonhazardous by outburst) zone from the side of previously driven roadway. The nomogram of numerical values of stresses is given for the conditions of the Pokrovskoe Mine, 1st northern belt road, panel No. 11. From the given calculations, radius of the unloaded nonhazardous by outburst zone in the vertical and horizontal planes around the driven experimental roadway of the 1st northern belt road, panel No. 11, was obtained with accounting anisotropy, depth of mining operations and rate of deformation. The analysis of the material presented in the article allows to conclude that the unloading effect of the driven roadway predetermines the safety of mining operations conducted in the hazardous by outburst sandstone, and drilling-and-blasting operations within the calculated protected zone can be performed as in the nonhazardous by outburst zone. In this research, regularities of the unloading effect of the roadways were established, and dependences were obtained to determine boundaries of the unloading zones in specific mining and geological conditions, which should be determined for each concrete roadway to perform the blasting operations. The presented justifications come to the fact that drilling-and-blasting operations used for ripping hazardous by outburst rocks in the roadway floor are carried out in the already unloaded (i.e. nonhazardous by outburst) zone, which is created from the same, previously driven, roadway. That is, it follows that drilling-and-blasting operations will be carried out in sandstone with no outburst hazard. This makes it possible to perform the drilling-and-blasting operations without making the forecast of the mine outburst hazard and without introducing the shock blasting mode, which, in turns, cut the time and labor costs and lead to significant savings of material and technical means. A further research is needed for establishing dependence between the size of the formed unloaded (nonhazardous by outburst) zone around the working roadway in sandstone and depth of mining operations, section of the roadway and time passed since the roadway was driven.","PeriodicalId":222378,"journal":{"name":"Geo-Technical Mechanics","volume":"31 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131989907","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}