Instability mechanism and blasting roof‑cutting control technology for deep soft rock roadway under thick‑hard roof
Year: 2026
Type: article
Abstract: Under dynamic loads induced by thick-hard roof fracturing, main roadways in deep soft rocks frequently undergo severe nonlinear large deformation. Taking No. 140504 working face of the Kouzidong Mine in Fu Yang, China as the engineering background, we established a strike-oriented mechanical model for the suspended roof. Using this model, we clarified the generation, propagation, and interaction of mining-induced dynamic loads with the roadway. By analyzing roadway deformation under the superposition of dynamic and static loads, we introduced a rock mass strength reduction coefficient ( ζ ) and derived a new mechanical instability criterion for deep soft rocks. Then we carried out a similar-material simulation test and captured the evolution of the overburden structure along the mining strike direction. Based on the findings, we determined the key parameters of the blasting roof cutting technology and applied this technique in the field. The monitoring results showed that this technique limits roof separation to less than 20 mm, reduces the maximum daily microseismic energy by over 50%, and significantly improves roadway stability.
Language: English
Subfield: Mechanics of Materials
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7225308137