Improving the efficiency of the technology and organization of the longwall face move during the intensive flat-lying coal seams mining at the Kuzbass mines

Abstract

The reasons for the lag of the indicators of the leading Russian coal mines engaged in the longwall mining of the flat-lying coal seams from similar foreign mines are considered. The analysis of the efficiency of the longwall face move operations at the JSC SUEK-Kuzbass mines was carried out. A significant excess of the planned deadlines for the longwall face move during the thick flat-lying seams mining, the reasons for the low efficiency of disassembling operations and the main directions for improving the technology of disassembling operations are revealed. The directions of ensuring the operational condition of the recovery room formed by the longwall face are considered. The recommended scheme of converged coal seams mining and a three-dimensional model of a rock mass to justify its parameters are presented. Numerical studies using the finite element method are performed. The results of modeling the stress-strain state of a rock mass in the vicinity of a recovery room formed under conditions of increased stresses from the boundary part of a previously mined overlying seam are shown. The main factors determining the possibility of ensuring the operational condition of the recovery rooms are established. It is shown that it is necessary to take into account the influence of the increased stresses zone when choosing timbering standards and organizing disassembling operations at a interbed thickness of 60 m or less. A sufficient distance from the gob of above- or undermined seams was determined to ensure the operational condition of the recovery room of 50 m, for the set-up room – 30 m. Recommendations are given for improving technology and organization of the longwall face move operations at the mines applied longwall mining of flat-lying coal seams with the formation of a recovery room by the longwall face.

Modeling of the Natural Objects’ Temperature Field Distribution Using a Supercomputer

“…The main problem in the development of mathematical and computer models is that it is necessary to find a compromise: on the one hand, it is necessary to take into account as many factors as possible that affect the physical process, since it is required to describe the real picture as fully as possible so that the model is as adequate as possible, corresponding to the original object. On the other hand, the complication of the mathematical, and, as a consequence, the computer model, makes it impossible to implement it by means of a computer, since such a model requires too much computer resources, which significantly affects the cost of installing, maintaining, and operating equipment [34,35]. In this regard, the second task of the study was to create a parallel algorithm which allows performing calculations more efficiently for a fairly complex model.…”

Features of the Technology of Forming an Artificial Mass in the Roof Rocks Above the Recovery Room

“…Для приготовления закладочного материала пред лагается применять оборудование, указанное в табл. 3.…”

“…Проблема длительных простоев очистных механизирован ных комплексов в период их демонтажа на угольных шахтах по мере развития техники набирает и без того высокую актуаль ность [1,2,3,4,5,6]. В период с 2011 по 2018 г. общее превыше ние сроков демонтажных работ на шахтах АО «СУЭК-Кузбасс» составило более 900 дней при длине лав от 230 до 300 м и средней длительности простоя в 35 дней [1,6].…”

Assessment of the Impact of Technological Development and Scenario Forecasting of the Sustainable Development of the Fuel and Energy Complex

“…In order to take into account a more local level of sector enterprises and to unite previous trends [55][56][57], the authors expanded the 3D concept with the fourth component [58][59][60][61][62]. Hence, 4D trends at the same time included: Digitalization-the trend towards the change in approaches to business processes based on the introduction of digital technologies;…”