Based on the field measurement of end resistance support during initial weighting basic roof and macroscopic mine pressure behavior period 101, 22,211, 103 301 fully mechanized caving face in Changchun Xing Coal Mine, law working is summarized compared. Furthermore, relationship between length, (the strength) obtained. In range length 126–230 m, with increase end-of-cycle gradually increases, d...

In the 3 years to June 30, 2008, 4,633 injuries occurring underground at NSW (Australia) coal mines were reported to the insurer. Equipment was involved in 2149 of these injuries (46%). The narrative field accompanying these reports was examined to determine opportunities for controlling injury risks. The most common equipment types involved were: Continuous miner (12% of all underground injuri...

Green mining plays a vital role in achieving environmentally friendly and ecologically sound practices. In domestic areas, the coal method is gradually transitioning from collapse to filling mining. Paste has been proven effective controlling surface deformation, although understanding of its underlying control mechanisms remains incomplete. This study focuses on E1302 paste-filling working fac...

To investigate the failure mechanisms of coal bursts in longwalls underground mines, a case study based on real burst Tangshan mine occurring 2 August 2019 was carried out to analyze cause and basic theories and, thus, propose approaches methods mitigate damage. The occurred mainly due sliding from longwall ribs simultaneous uplifting floor. As result retraction, roof above seam too stable coll...

The determination of propulsive abutment pressure and deformation characteristics roadway surrounding rock mass in top-coal caving mining is great significance for further research on stress, support equipment selection. This paper adopts the method combining theoretical analysis field test, taking Helin coal mine j7401 working face as object. relationship between revealed by monitoring stress ...

The development pattern of fractured water-conducting zones (FWCZs) is closely related to mining safety and water conservation in areas. However, neither the nor empirical formula prediction height FWCZs are clear for fully mechanized caving conditions wet collapsible loess We took Lu’an Coal Mine as a case study, employing field measurements numerical simulation investigate surface subsidence ...

The article proposes a constructive technical solution to increase the contact adaptivity of mechanical roof support. developed mechanized support section is able adapt changing mining and geological conditions in process excavation pillar, which increases efficiency safety coal longwall.

The deformation control of roadways surrounded by rock in the fully mechanized amplification sections extra-thick coal seams is problematic. To analyze failure and characteristics a support frame, as well processes surrounding rock, through theoretical analysis industrial tests, conditions return airway caving face an seam Yangchangwan Coal Mine, Ningdong mining, area were examined. Combined wi...