Abstract
Hydraulic support instability mechanism and its control in a fully-mechanized steep coal seam working face with large mining height
Highlights
In 2013, coal production in China was 3680 Mt, accounting for more than one-third of the total world output
Hydraulic support instability is likely to occur on steeply dipping coal seam working faces where fully-mechanized mining with a large mining height (FMMLMH) is applied
In order to control hydraulic support instability (HSI), the mechanism of HSI in FMMLMH was modelled and interpreted, and the critical instability angles for the three HSI forms, i.e. hydraulic support gliding (HSG), hydraulic support tilting (HST), and hydraulic support tail twisting (HSTT) were obtained
Summary
In 2013, coal production in China was 3680 Mt, accounting for more than one-third of the total world output. It is essential to ensure mining safety in thick coal seams, especially concerning the prevention and control of hydraulic support instability (HSI), which poses a significant threat to the safety of mine workers and equipment (Tu, Yuan, and Yang, 2009). Due to the large mining height and intense induced ground pressure, HSI often occurs in FMMLMH, especially in the working faces of steeply dipping coal seams. The poor stability of hydraulic support and difficulty of HSI control are the chief obstacles to the widespread implementation of FMMLMH technology (Yuan et al, 2010). Wang analysed the stability and applicability of hydraulic support with a two-prop shield (Wang, 2009; Liu, 2006)
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