Fairly Steep. Fairly . Steep. Fairly . Steep. Low / Moderate. ... room-and-pillar mining of thick seams –"Benching ... in mining steeply dipping orebodies in s table rock masses ...
For studying the strata behavior due to multi-slicing top coal caving longwall mining along-the-strike direction in steeply dipping extra thick coal seams, the shield support pressures of the upper and lower slices of panel 37220 in Dongxia Coal Mine were monitored using the KJ513 dynamic monitoring system.
Table 2 summarises angle values for several cases studied at the coalfields of northwestern Spain. Fig. 4, Fig. 5 summarise the results of the case described in Rodrı́guez and Toraño [9] in which the subsidence produced by the extraction of a 3.00–3.50 m thick near-vertical seam (75°), using the sublevel caving method, is analysed. The height of …
The breaking features and stress distribution of overlying strata in a steeply dipping coal seam (SDCS) differ significantly from those in a near-horizontal one. In this study, the laws governing the evolution of vertical stress release and shear stress concentration in the overlying strata of coal seams with different dip angles are derived …
The height of the water-conducting zone is of significant importance for the safety of underground mining under a water body. Fully backfilling a mine excavation with gangue provides the advantages of safety and efficiency during the extraction of coal under buildings, railways and water bodies. Based on a mine with steeply dipping coal …
The deformation and failure law of stope roofs is more complicated than horizontal coal seams affected by the angle of the coal seam during the mining process of steeply dipping coal seams.
A new profiling function is proposed to predict the value of surface subsidence over longwall panel in the inclined seams. This function was used at the Parvada-2 mine in Tabass coal region, Iran. The calculated results are compared with the real movements obtained by field measurements.
Top-coal caving mining was first applied to the mining of steep coal seams in France, Spain, and the Socialist Federal Republic of Yugoslavia in the early twentieth century; the technique was later extended to thick coal seams in the mines of the Soviet Union, France, and other countries during the early 1950s [].Fully mechanized caving …
The system has been used to extract steep coal seams 20–25 m thick in the Spanish province of Leon ... Yang, W.; Li, L.; Li, X.; Wang, L. Water outbursts in underground mining with steeply dipping coal seams: Numerical simulations based on a mining case. Eur. J. Environ. Civ. Eng. 2014, 18, 511–535.
1. Introduction. In recent years, with the development of SDCS mining and combining mining technology, the number of steep coal mines in China has increased year by year, and therefore the coal production, as well as the economic benefits, has increased [1 – 7].At the same time, the rockfall hazard, a disaster that occurred in SDCS mining, …
Based on a systematic analysis of the deformation and instability of the surrounding rock in the quarry of a steeply dipping coal seam, the structural model of coal pillar for multi-section mining ...
Creative mining methods have been evaluated to optimize production in steep seams, and thick seams in particular. These methods involve mining the openings at shallower gradients by mining cross-seam or at an angle to the highwall.
In underground coal mining, the working environment is completely enclosed by the geologic medium, which consists of the coal seam and overlying and underlying strata. Depillaring is one of the most dangerous phases of underground coal mining. Even after centuries of experience in underground coal mining, there is no well …
:1423*(.4631 In the Chinese coal industry, a steep coal seam is defined as one that dips at an angle greater than 45° (Cao and Gou, 2011), as shown in
Surrounding rock control is problematic at irregular fully-mechanized working faces of inclined seams. This study investigated the evolution of mining-induced stress at a variable-length working face under different coal seam inclination angles by using FLAC3D software to establish an experimental model based on the occurrence conditions of the …
Abstract n Mining steeply dipping coal seams is a difficulttask. Prior to 1996, fully mechanized ... constraints in mining steep seams is established here, and a theory of strata control and hazard
Corpus ID: 106812613; Theory and practice of fully mechanized longwall mining in steeply dipping coal seams @article{Wu2013TheoryAP, title={Theory and practice of fully mechanized longwall mining in steeply dipping coal seams}, author={Yongping Wu and Panshi Xie and Hongwei Wang and Dongfeng Yun and Shiguang Ren and Xioaokun …
Abundant and widely distributed in China, steeply inclined coal seams generally have diverse and complicated geological characteristics. Intrinsic problems in mining such seams, such as large dip angle, short length of mining face, ineffective sealing and protection of working space by support systems, poor stability of equipment, …
The deformation and failure law of stope roofs is more complicated than horizontal coal seams affected by the angle of the coal seam during the mining process of steeply dipping coal seams. This study focused on and analysed the working face of a 2130 coal mine with steep dipping and large mining height.
The stability mechanism and control technologies for rock–equipment has been applied in fully mechanized caving mining of steeply inclined coal seams in …
Many recent examples have shown that rockfalls can occur in underground steep coal mines. The stratigraphic circumstances, block formation mechanism, and …
Structure stability analysis of rock masses is essential for forecasting catastrophic structure failure in coal seam mining. Steeply dipping thick coal seams (SDTCS) are common in the Urumqi coalfield, and some dynamical hazards such as roof collapse and mining- induced seismicity occur frequently in the coal mines. The cause …
The key technologies for mining steep coal seams include global and regional strata control methods in the longwall face; methods for the longwall face machines to sustain static …
Abstract Steeply inclined seams buried at dip angles of 35–55° are considered hard-excavated seams in the mining industry. A partial backfilling method based on sub-regional features of surrounding rock deformations and failure and support stability was proposed to realize safe, efficient production, to promote sustainable …
The mining of steeply dipping coal seams involves significant safety risks because of instability caused by the weak nature of surrounding rocks and their movement after …
French coal miners in the Lorraine Basin coalfields of Charbonnages de France, work under extremely difficult mining conditions. The coal seams are located in two parallel anticlines dipping to the southwest. On the northwest flanks the coal dips at angles up to 40/sup 0/; on the southeast flanks the coal dips as steep as 90/sup 0/.
The key technologies for mining steep coal seams include global and regional strata control methods in the longwall face; methods for the longwall face machines to sustain static and dynamic...
With the innovative use of three-dimensional coupling control principle for surrounding rock, we successfully resolve the technological difficulties of longwall mining …
Abundant and widely distributed in China, steeply inclined coal seams generally have diverse and complicated geological characteristics. Intrinsic problems in mining such seams, such as large dip angle, short length of mining face, ineffective sealing and protection of working space by support systems, poor stability of equipment, …
A coal mining method that accounts for less than 1% of deep coal production, Shortwall involves the use of a continuous mining machine with moveable roof supports, similar to longwall .
Underground mining of semi-steep and steep seams is connected with high labor costs and low productivity. Furthermore, this process is difficult and requires continuous presence of personnel in ...
Rockfalls in underground steep coal seams are very harmful to personnel and mining equipment because of their stratigraphic circumstances, block formation mechanism, and cumulative damage effects. There is an increased danger in SDCSs, especially when protective measures are not installed in longwall workings.
The breaking features and stress distribution of overlying strata in a steeply dipping coal seam (SDCS) differ significantly from those in a near-horizontal one.
Semantic Scholar extracted view of "THEORY AND PRACTICES OF FULLY MECHANIZED LONGWALL MINING IN STEEPLY DIPPING COAL SEAMS" by et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo ... existing in steep seam mining on longwall mining working face, is improved, and the flying gauge …
