Mechanism study on the sandstone roof caving characteristics for improving the preconditioning measures to mitigate the windblast risk in coal mines
by Jinhe Jia; Zhichao Wang; Zhen Zhang
International Journal of Mining and Mineral Engineering (IJMME), Vol. 15, No. 1, 2024

Abstract: The geological feature of sandstone strata directly overlying coal seams is common in the Shendong shallow buried coal field, and causes delayed roof caving and the risk of windblasts in the initial longwall mining stage. To mitigate windblasts, preconditioning measures, such as hydraulic fracturing operations and temporary blasting operations, are employed to improve the roof caving performance. Site observations show that the thicker the overburden, the more difficult the roof caving becomes, and the conditioning measures do not produce very good roof caving performance as expected when the overburden thickness approaches 200 m. Numerical simulations are employed to investigate the roof-caving mechanism associated with the geological conditions of the Shendong coal field. The numerical results show that structurally controlled instability is the main mechanism of the roof caving; the gravitationally-loaded horizontal stress can lead to worse roof caving performance in the case of greater overburden thickness.

Online publication date: Wed, 29-May-2024

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Mining and Mineral Engineering (IJMME):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com