Izvorni znanstveni članak
https://doi.org/10.1080/00051144.2024.2399337
The analysis of damage mechanisms and vibration effects caused by cut blasting under various void shapes
Huifeng Qin
; Shijiazhuang tiedao University, Shijiazhuang Civil Engineering College, Hebei Province, People’s Republic of China
Yan Zhao
; Hebei University of Architecture,Zhangjiakou Civil Engineering College, Hebei Province, People’s Republic of China
*
Hailong Wang
; Shijiazhuang tiedao University, Shijiazhuang Civil Engineering College, Hebei Province, People’s Republic of China
Lijie Ge
; Hebei University of Architecture,Zhangjiakou Civil Engineering College, Hebei Province, People’s Republic of China
* Dopisni autor.
Sažetak
The effect of the void shape on cut blasting is investigated by establishing a damage analysis
model for a void using an improved calculation formula for stress on the wall of the void. Additionally, an optimization scheme is provided for the “square void cutting theoretical model.” The
vibration effect of the rock mass outside the excavation area is simultaneously monitored, and
its validity is substantiated through experimental and simulation-based verification. The findings
indicate that the variation of q2sinθ over time aligns with the dynamic loading process of wall
stress in holes. Under the influence of longitudinal waves, thin-walled circular damage occurs,
and tensile effects from reflected waves are influenced by impedance. In a square void cutting
model, two-stage stress waves cause tensile shear damage and inward collapse in the rock mass
along hole walls. The explosive energy generated by square holes significantly contributes to
fragmentation of rock masses. The circular empty-hole cutting model generates significant vibrations in central areas due to resistance. Vibration velocity in 45° direction for circular holes is lower than that for square voids outside cuts while vibration velocity remains equivalent between
circular and square holes at 90° direction.
Ključne riječi
Damage mechanism; longitudinal wave impact testing; dynamic evolution of stress; numerical simulation of rocks; vibration influence
Hrčak ID:
326342
URI
Datum izdavanja:
10.9.2024.
Posjeta: 0 *