The paper presents the results of borehole stability research and considers possible causes of emergencies. The features of the blast hole drilling process are analyzed taking into account the properties of the rock. Based on the distribution of speed of drill fines removal from the well, an algorithm for selecting drilling modes is proposed. The nature of change in the size of the holess over time has been analyzed. This paper investigates the influence of rock fracturing and its water content on borehole stability. Possible options for eliminating the man-made impact on the massif near holes and options for fixing the hole walls with soft shells are suggested. The experimental data on the installation of shells for the conditions of open mining of apatite-nepheline ores are given. The operability and effectiveness of the technology is proved.
The paper deals with the application of air and hydraulic hammer tools for the destruction of hard rock in the mode of continuous operation. The regularities of the effectiveness of demolition of rock, depending on the shape and angle of the executive body to the surface are deter-mined. There are recommendations for use the executive bodies of shock mining machines in the article.
Status of the marginal zone of the reservoir developed largely determines the conditions of interaction of mechanized roof supports of the complex and surrounding rocks, and also defines direct link with deposition of surface and gas evolution in the face cleansing. In this paper we consider the influence of strike face speed subsidence at the surface and condition of the marginal zone of the reservoir.
On the basis of the experimental data received at erection mass of a file by throwing car with the bottom emission of breed, in the conditions of negative temperatures laws of distribution and a trajectory of flight of pieces of breed of the various sizes are established.
On the basis of consideration of processes of the is intense-deformed condition of a regional zone of a layer it is established that in the in a complex- mechanized clearing faces probably occurrence of the weakened zones. Within these zones inevitably occurrence of superfluous guantity of the methane accompanied by exsplosions of gas and a dust.
Use of traditional technologies by development of deposits of the minerals having hard layers of a roof and ground, becomes complicated difficulties of management of mountain pressure. In these conditions have gained distribution the technologies providing оставление of sights for maintenance of the basic roof. To leave a pillar sights conducts to significant losses of a mineral. Use of a bookmark instead of sights gives a gain of stocks of a mineral, raises efficiency and safety of mountain works. In work data about effective areas of descent and transport dry stowing materials in mountain developments are cited.
The underground extraction of deposits with coal-plough machines using for the mine destruction is the long-range outlook because of the full workflow automation. The grave disadvantage of mechanical destruction is heavy energy consumption on separation of. The authoring is evidence of the possibility of the coal-plough machines creation with a new principle of ore separation on the basis of the big debris ore break off. The principle is developed in SPMI and it’s permitted to reduce energy consumption on the ore destruction in comparison with legacy domestically produced and world-wide prototype.
The article deals with the development of mechanics as a science in its historical development up to the beginning of XX century. The peculiarity of the historical development of mechanics is due to the development of technology. At the initial stage till the end of XVIII - beginning of XIX centuries technique was ahead of mechanics development, and then with the development of differential and integral calculus mechanics begins to be ahead of technique and provides its further development. The article reexamines the phases of development of technique and mechanics, while noting the trends in the development of individual sections of mechanics. Due to the emerging needs of mining, both simple and compound machines (pumps, winders, blowers, etc.) arise and are improved. With their appearance arises the need for their maintenance and repair. Special attention is paid to the contribution of Russian scientists and inventors to the progress of engineering and mechanics.
This paper deals with the formation of various scientific societies, their influence and role for the development of fundamental and natural science disciplines. Some aspects of the development of such a fundamental science as mathematics, starting from the moment of its origin and up to the present time, are considered in sufficient detail.
The issues of laying of chambers on the brine fields of great depths are considered. The factors that have a favorable impact on the stability of underground dissolution chambers have been revealed. It is proposed to develop the reserves of dome-type deposits from depths of more than 2500 m.
Рассмотрены вопросы перспективного применения пневмобаллонной крепи в гибких технологических схемах отработки пластов многолетнемерзлых пород буровзрывным способом. Даны рекомендации по определению оптимальных параметров очистки забоев.
Отработка россыпных месторождений подземным способом в условиях много летней мерзлоты осуществляется камерными и камерно-лавными системами разра ботки ...
Разработка россыпных месторождений подземным способом в районах многолетнемерзлых пород осуществляется в большинстве случаев камерно-лавными системами разработки ...
Шахтными и лабораторными исследованиями методом объемных моделей установлено, что работа основной кровли в известной мере аналогична работе тонких плит. В общем случае основная кровля в режиме ее установившегося движения представляет собой консольную плиту на упругом основании, которая опирается на массив угля впереди очистного забоя и околоштрековые целики ...
