It is shown that the creation of the variants of resource-saving systems for the development of long-column mining is one of the main directions for improving the technological schemes for mining operations in the mines of the Kuang Nin coal basin. They provide a reduction in coal losses in the inter-column pillars and the cost of maintaining preliminary workings fixed with anchorage. The implementation of these directions is difficult (and in some cases practically impossible) when tight rocks are lying over the coal seam, prone to significant hovering in the developed space. In the Quang Ninh basin, 9-10 % of the workings are anchored, the operational losses of coal reach 30 % or more; up to 50 % of the workings are re-anchored annually. It is concluded that the real conditions for reducing coal losses and the effective use of anchor support as the main support of reusable preliminary workings are created when implementing the idea put forward at the St. Petersburg Mining University: leaving the coal pillar of increased width between the reused mine working and the developed space and its subsequent development on the same line with the stoping face simultaneously with the reclamation of the reused mine working.
Results of the analysis of factors influencing the probability of accidental groundwater inrush into mine workings of salt (potash, potassium and magnesium) mines are given in the article. The cases of the potash mine flooding that occurred in different countries with developed mining industry are given. It is shown that at the present technical and scientific level of solving this problem the unexpected groundwater inrush in potash mines usually results in the shutdown of the enterprise and negative ecological consequences. It is pointed out that the underground waters flow into the mines through water-conducting fractures of either natural or technogenic origin which location and influence on a mine was almost impossible to predict at the design stage under existing regulations. The concept of reducing the risks of potash mine flooding caused by underground waters in-rush is formulated. Administrative and technical measures which allow reducing the risks of potash mine flooding caused by groundwater inrush into the excavations are considered.
The article focuses influence of disjunctive dislocations on parameters of secure zones on flat-lying adjacent coal seams is considered.
The most influencing the stopes walls stability factors have been determined. Physical-and-mechanical ore mass properties impact to the stopes height has been researched. Advanced ways to improve stopes walls stability have been considered.
In the article the problem associated with the necessity of application of the full goaf stowing technology in developing the steep coal seams in terms of Mao Khe deposit in Vietnam is presented.
The Memory Of A. A. Borisov,
The data characterized potentials of scientific school have been presented in the paper. The role of school in solving the problem of coal, ore and non-metallic deposits have been described. The perspective direction of scientific school development has been carried out.
The role of the Holodninsky ore deposit in ensuring need of the Russian Federation in extremely scarce raw materials – zinc and lead is shown. Technical solutions for decrease in ecological risks at extraction of this ore deposit are considered. Conclusions are drawn on prospects of extraction of the Holodninsky ore deposit.
The analysis of actually developed technological scheme of Jakovlevsky mine is made. The basic directions of perfection of existing technology of working off for-passes, promoting increase of capacity and decrease in costs proiz-vodstva ores are offered. The further direction of researches which will allow oprede-pour rational, a relative positioning clearing заходок in fulfilled layers and para-metres of technological schemes of joint dredging of layers is con- sidered.
The analysis of factors complicating the development of the Kholodninskoye deposit within the catchment area of Lake Baikal is carried out. Organisational and technical arrangements implementation of which reduces ecological risks while mining this deposit are worked out.
Mining systems for ore bodies of different thickness are developed for the conditions of Cholodninskoe deposit. Ration parameters of mining system are determined.
The article presents the results of the analysis of the Russian coal mines experience in using the variant of the long-pillar development system with the abandonment of coal pillars in the mined out areas of longwall faces. In the Kuzbass mines, this option accounts for 90-95 % of the total volume of coal mined by the underground method. It is pointed out that it is necessary to take into account the negative influence of the pillars left in the worked out space on the geomechanical conditions of conducting mining operations in the overworked (underworked) seams. A significant negative effect of the pillars is shown in combination with selective extraction of the adjacent layers on reduction of the balance reserves. The measures allowing to increase the efficiency of the use of long pillar mining systems for the development of adjacent series of seams are considered.