Steep Seams Research Articles

Steep seam mining in France : Forryan, M A Colliery GuardV238, N11, Nov 1990, P288–291

Steep seam mining in France : Forryan, M A Colliery GuardV238, N11, Nov 1990, P288–291

Mining subsidence and displacement prediction using influence function methods for steep seams

The prediction of subsidence and displacements arising from longwall mining of steep seams is examined. Various influence function methods and the U.K. Subsidence Engineers' Handbook empirical design technique are compared for different mining conditions. Comparisons are made between the methods reviewed. The results of predictions with these methods are compared with field observations.

幌内炭鉱の深部移行に伴う坑内条件と技術改善の推移

Working Level of Horonai Coal Mine which is the most deepest mine in Japan has reached up to the depth of S.L (Sea Level)-1, 210 m, i.e. to the 10th Level.The distance between the Levels isvertically 70 m and our present rate of deepening in a year is 20m. As a coal mining method, we have been adopting mechanized mining since 1969 using Self Advancing Powered Roof Support with Double Ranging Drum Shearer.Horonai Coal Mine has been tormented with two large problems.1. One of the high temperature environment in underground.2. Other is the inclination increase of mechanized working face.According to the deepening ofmining area, the working environment is getting worse year by year owing to the high temperature and inclination increase.Since 1983 we have been studying positively to solve these problems and have tried various countermeasures.1. Central Cooling System which is the first installation of its kind in Japan, adding to the operation of former type partical cooling system. We could have succeeded to obtain almost sufficient environmental condition.2. We have been adopting mechanaized mining techniques for the coal seams inclination, which was limited to about 25 degrees. As a result of reinforcement and improvement, it hasbecome possible to mine under the steep seams inclination of 43 degrees inclination. It was solved by the mechanized mining techniques for the steep coal seams of about 40 degrees inclination.

Evaluating the conditions of spread of endogenous fires in steep seams

This article correlates the collapse behavior and rock mechanics of an inclined coal seam with its combustibility and the projected spread of a mine fire along the shaft or roadway in an extensive mathematical model which takes into account such variables as coal porosity, deformation, displacement, and gas composition and which can be used to forecast and prevent possible fire hazards.

Trends in the development of comprehensive mechanization equipment for working thick gently sloping and steep Kuzbass coal seams with filling of the worked-out space

1. For working thick steep coal seams with a system of level technologies and the back-filling of worked-out space, a standardized set of equipment should be created to advance the face using aggregate support systems with a base that would be able to maintain internal outward pressure, on which the cutter-loader, conveyor, and filling equipment are installed. 2. As a core for building the standard set of machinery to mine thick steep coal seams in the Kuznetsk Basin with the backfilling of worked-out space. The aggregate statically stable and actively controllable mechanized support system of KVZ complex can be used in this context.

Steep seam mining experience aids chock shield design : Colliery Guard V232, N12, Dec 1984, P445

Steep seam mining experience aids chock shield design : Colliery Guard V232, N12, Dec 1984, P445

Computer Assisted Remote Control and Automation Systems for Longwall Shearers

The automation and centralized monitoring of longwall type underground mining is presently an important subject matter of research in France. The purposes are : . to improve safety and working conditions . to increase productivity. . to improve efficiency in machine operation through continuous “health monitoring”. . to make winning possible in difficult seams. For these purposes, CERCHAR has developed adequate equipment for shearer monitoring and remote control : . a direct view remote control system, TELSAFE, which allows one or two machine-operators to control the shearer from a remote place (typically 30-40 feet) safe from dust and falling blocks. This system is of general use in French coal mines . a high rate teletransmission system transmitting analog and digital data from the shearer to a remote station through the machine power cable. . a remote control system to drive the shearer from a remote station also through the power cable. These two systems operating through the power cable were mounted on a shearer working in a very steep seam (almost vertical) iri the Lorraine Collieries. The driver's station is located a few hundred meters from the face at the end of the panel. Data Collected from the sensors on the shearer is transmitted to a micro-computer which then displays on a graphic color terminal a mimic diagram of the machine, of its position and motion in the face, including different values of typical operating parameters and automatic default warning. Research is in progress to build algorithms for real-time optimization of shearer command.

A study and choice of parameters of mechanical reinforcement of level pillars by anchors of an enhanced carrying capacity

Improving efficiency of the extraction of coal from steep seams depends largely on the need for preventing the development of sources of endogenous fires. The authors have tested in the laboratory the possibility of insulating the level pillars with a rock strip bounded on top and bottom by pliable guard supports with two rows tied with a steel cable. For maintaining the level pillar, the anchor support system should ensure its stability under deformation levels across the course of up to 15% and along the dip up to 8% of the seam thickness. The pillar should maintain the continuity and integrity of the bed.

Chock shield technology in steep seam mining : Colliery GuardV232, N11, Nov 1984, P345–346

Chock shield technology in steep seam mining : Colliery GuardV232, N11, Nov 1984, P345–346

Development of mobile support systems in the excavation of thick steep seams

The authors discuss the prospects for solving the problems associated with movable support systems. Mining and geologic conditions and technical data show that a strong and light-weight design for a support system can be built that will meet all the requirements. The development of elastoplastic movable support systems of the KPP type, combined with level insulation and filling of the workedout space, will ensure effective excavation of thick steep seams.

Assessment of floor stability during steep seam mining (In Russian) : Frumkin, R A UgolN6, June 1983, P11–14

Assessment of floor stability during steep seam mining (In Russian) : Frumkin, R A UgolN6, June 1983, P11–14

Condition of the solid coal surrounding outburst cavities in steep seams (in Russian) : Khorunzhii, Y T Ugol UkrN12, Dec 1982, P37–38

Condition of the solid coal surrounding outburst cavities in steep seams (in Russian) : Khorunzhii, Y T Ugol UkrN12, Dec 1982, P37–38

Sub-level caving in steep seams (in French) : Poyol, F Publ Tech Charbon FrN3, 1983, P153–166

Sub-level caving in steep seams (in French) : Poyol, F Publ Tech Charbon FrN3, 1983, P153–166

Physico-chemical methods of preventing gas emission and outbursts in steep seam shield faces (in Russian) : Abramov, F A Ugol UkrN10, Oct 1982, P22–24

Physico-chemical methods of preventing gas emission and outbursts in steep seam shield faces (in Russian) : Abramov, F A Ugol UkrN10, Oct 1982, P22–24

Assessing the probability of repeated outbursts in steep seams (in Russian) : Khorunzhii, Y T Ugol Ukr, N5, May 1982, P37

Assessing the probability of repeated outbursts in steep seams (in Russian) : Khorunzhii, Y T Ugol Ukr, N5, May 1982, P37

Supports for inclined and steep seams (in Polish) : Chodzko, M; Pretor, W Mech Autom Gorn, V20, N6, June 1982, P26–31

Supports for inclined and steep seams (in Polish) : Chodzko, M; Pretor, W Mech Autom Gorn, V20, N6, June 1982, P26–31

Reinforcement of rock and coal in steep seams in the donbass by means of chemical roof bolting (in Russian) : Gorgonov, A T; Salnikov, V K Ugol Ukr, N2, Feb 1982, P14–16

Reinforcement of rock and coal in steep seams in the donbass by means of chemical roof bolting (in Russian) : Gorgonov, A T; Salnikov, V K Ugol Ukr, N2, Feb 1982, P14–16

Predicting rock behaviour in steep seam faces (in Russian) : Ugol Ukrainy, N5, May 1981, P14–16

Predicting rock behaviour in steep seam faces (in Russian) : Ugol Ukrainy, N5, May 1981, P14–16

Update in the hydraulic mine strata mechanic studies in thick and steep seams of rocky mountains : Fisekci, M Y; Chiang, C; Bannerman, W Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28–30 May 1980, P458–467

Update in the hydraulic mine strata mechanic studies in thick and steep seams of rocky mountains : Fisekci, M Y; Chiang, C; Bannerman, W Proc 21st US Symposium on Rock Mechanics, Rolla, Missouri, 28–30 May 1980, P458–467

Large-hole drilling in steep seams (in German and English) : Mertens, V; Gathmann, B Gluckauf, V116, N9, 8 May 1980, P432–437 (English version P198–201)

Large-hole drilling in steep seams (in German and English) : Mertens, V; Gathmann, B Gluckauf, V116, N9, 8 May 1980, P432–437 (English version P198–201)