Highwall mining is a remotely controlled mining method which extracts coal from the base of an exposed highwall. The method has the advantage of low capital cost and less lead time compared with a full underground mine, while being capable of producing in excess of 1 million tonnes per system per year....

The movement law of overburden strata in backfill mining face was studied, by the method of similar material simulation, on the background of the paste filling mining in Daizhuang Coal Mine, and in consideration of change of filling body strength with time. The results showed that the immediate roof...

There are many factors that influence part-filling pillars’ stability. In deep mining, the main factors are filling rate and the pillar’s internal friction angle that can influence the pillar’s plasticity area greatly in the process of filling pillar’s deformation and destroyment. This paper takes filling...

For recycling the remaining coal pillars resources in strip mining, a repeated mining method of using the strip filling replacement of strip coal pillar is proposed, a technical principle of strip filling controlling surface subsidence is illustrated, and the main filling factors which influence the...

Based on the monitoring data of surface subsidence in 230 mining area of Tangkou Coal Mine, the surface dynamic subsidence characteristic under deep mining subsidence and the maximum subsidence velocity were analyzed. The results showed that: in the deep mining that exceeds 300 meters, the ground surface...

Aiming at gob-side entry retaining for three typical roof conditions (hard roof, medium stable roof and limestone roof), theoretical analysis, numerical simulation, laboratory test and field test were carried out. Different support mechanical models were built, and various roadside support technologies...

Stress concentration caused by deep strip-pillar mining will give rise to rockburst. Mining and retaining parameters have a major influence on stability of coal pillar. Ideally, FLAC3D was used to analyze the distribution and evolution of vertical stress, deformation, advanced abutment pressure and elastic...

In China’s energy reserves and production, the thick coal seams account for almost 45 per cent of national coal resources. It is in dominant position for coal mining. At present, mining methods of thick coal seam include slicing, top coal caving and large cutting height. Although these methods have achieved...

Coal burst and mine earthquake frequently occur with high strength in impact roadway. Bolting system will produce a certain dynamic response under the impact load disturbance. Bolts will be damaged and rock will be instability when it serious. How to design bolting system in impact roadway is a major...

11605 coal face is the first working face in the lower series coal of Daizhuang coal mine, whose gateway drives along No.16 coal seam, containing iron sulfide with the thickness of about 300mm under the roof of 400 ~ 500 mm. To insure efficient driving of 11605 face gateway and meet the construction...

Based on the linear function between the maximum horizontal stress obtained by fitting the measured in-situ stress test result and buried depth, FLAC3D software was used in this paper to analyze the characteristics of lower-group roadway surrounding rock under the influence of multi-mining of deep nearly...

Fault fracture zone due to the loose and broken surrounding rock of roadway, tectonic stress, the surrounding rock deformation is hard to control, has been one of the difficulties in roadway support technology research. This paper aim at Xingcun coal mine-1196m level roadway through extra large fault...

This paper describes a new method of roadway support in deep mine. More than 70% of China's coal reserves exist -800m depth below. Along with the increased growing coal mining depth, mines in most mining areas are facing deep mining problems. Currently, the main support means in deep high pressure roadway...

Baodian mine is gradually mining shallow area with thin bedrock, and failure height of overburden strata in shallow area has a certain difference from one of thick bedrock area. According to the measurement of “Two zones” in 5304-1top slice face and 5304 mechanized sublevel caving face, the paper confirms...

Based on the characteristics of the deep large cross-section rock tunnel, inclined empty wedgy cutting technique, mechanized working line composing of full-hydraulic excavating drill-camel and loader buckets, secondary bolt/shotcreting support technique are proposed. These techniques effectively solve...

The large-section gob-side tailentry of the sublevel caving face often deforms heavily in the horizontal direction when driving and mining in deep mines, especially the side of solid coal, so it is difficult to support and needs several maintenances for the enough space. The control mechanism and technology...

In order to study the durability of gangue paste, the cement, fly ash and gangue were mixed with the proportion of 1:4:6 to compose paste and the mass concentration was 74%. Anti-erosion, anti-permeability and heat stability of filling body after 28d’s maintenance were tested. The results showed that...

The article considers the methods of working off of coals with high content of natural radionuclide (NRN) that allow for the coals’ completeness of the getting and environmentally reducing their safety on the example Urtuysky brown coal’ deposit opencast mining located in Trans-Baikal region.

With the development of coal deposits Siberia, the open way and justified ways of progressive technologies are researched based on the new technological and organizational principles of spatial development of the front mining operations at open pits.

By using the image processing and numerical functions of MATLAB, after the treatment of SEM image to mudstone specimen with threshold segmentation, filtering and other procedures, we can obtain binary image of mudstone; and determine the fractal dimension of the image by MATLAB program. The results showed...