Safety improvement in recycle development headings in potash mines: Current problems and prospects

The article discusses basic procedures of safety in recycle development headings in the Starobinsky potassium salt deposit. The prime no-pillar flow charts for longwall mining of complex-structure seams assume protection of recycle development headings with support installation behind the face line at the boundary with mined-out area. One of the most complicated tasks in implementation of such flow charts is safety of such headings in the sections between the longwall face line and the nearest cut-through toward the mined-out area. The underground and analytical investigations prove that recycling of paired development headings in long longwalls in the Starobinsk deposit is impossible in case of standard flow charts without additional protection measures. The nature of change in the finished cross-section of haulage drift n the test area shows that rock falls in the drift take place from the side of a yielding pillar, which is explained by the different compression characteristics of the pillar and intact rock mass. The ways of improving the no-pillar technologies of longwall mining and recycling of development heading are identified.

Sokol D. G., Le Quang Phuc, Than Van Duy Safety improvement in recycle development headings in potash mines: Current problems and prospects. MIAB. Mining Inf. Anal. Bull. 2020;(12):33-43. [In Russ]. DOI: 10.25018/0236-1493-2020-12-0-33-43.

D.G. Sokol¹, Graduate Student, e-mail: sokaldzianis@gmail.com,
Le Quang Phuc¹, Graduate Student, e-mail: lequangphuc@humg.edu.vn,
Than Van Duy¹, Graduate Student, e-mail: thanduyvp@gmail.com,
¹ Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia

D.G. Sokol, e-mail: sokaldzianis@gmail.com.

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