The working face of 12,110 in Shoushan 1 mine of Pingdingshan mining area applies double-side (wind tunnel and machine tunnel) roof cutting and pressure relief technology, which is intended to solve the problem of difficult mining and excavation connection. The schematic diagram of the roof-...
Longwall miningAbutment angleNon-linear multivariate regressionGene expression programmingGolden eagle optimizerAbutment angle is a key parameter to correctly determine the weight of overlying strata of destressed zone above the longwall panel roof that is transmitted to the adjacent barrier pillars and the...
sudden roof collapse accidents and coal bursts, this study investigates the relationship between extra-thick hard roof movement and mining-induced stress using physical experiments and numerical simulation methods based on mining activities in a longwall panel in the Yima mining area, Henan province, ...
Schematic diagram of mining. Since the operation of coal mining machinery just generates limited disturbance energy in the working face and affects a small range of area, this study focuses on analyzing the effect of disturbance load on Area A. In order to study and analyze the law of dynamic...
Such relation – presented also graphically in form of the diagram – determines significance and influence of the effective working time onto obtained mining output. This relation should be considered as motivation in particular for supervisory personnel, as it shows advantages resulting from elongation...
Reed, "Ground response curves for long- wall support assessment," Institution of Mining and Metallurgy. Transactions. Section A: Mining Technology, vol. 114, no. 2, pp. A81-A88, 2005.Medhurst, T. P. and Reed, K. (2005). Ground Response Curves for Longwall Support Assessment. Trans. ...
(3) the length of the block “B” which “protects” the gob-side entry is 10–13 m; (4) stress distribution formula for the elevating section is derived; and (5) the roof pressure of the gob-side entry is much smaller than non-gob side entry and is smaller than the pre-mining ...
energies Article Mechanism and Prevention of a Chock Support Failure in the Longwall Top-Coal Caving Faces: A Case Study in Datong Coalfield, China Zhu Li 1, Jialin Xu 1,2,*, Shengchao Yu 1, Jinfeng Ju 3 and Jingmin Xu 4 ID 1 School of Mines, China University of Mining and Technology...
In the present article, two longwall mining machines have been analyzed: a cutter-loader and a plow. The analysis was based on one of the quality engineering tools - the Pareto-Lorenz diagram. This tool allows for grouping the causes of breakdowns and establishing which of them are the most...
During the mining period, the basic roof of the longwall panel no. 8102 will form a C-shaped overlying rock structure. Figure 8. Schematic diagram of T-shaped overlying rock spatial structure. (a) Schematic diagram of symmetrical short-arm T-shaped overlying rock structure section. (b) ...