Optimization of cut‐hole layout under high in situ stress based on numerical simulation and field tests
Year: 2025
Type: article
Abstract: A well‐designed cut‐hole layout is crucial for improving drilling and blasting efficiency in deep underground engineering. For this purpose, this study investigates the patterns of blast‐induced rock damage under various cut‐hole layouts and ground stress conditions through numerical simulations and field tests. The key cut‐hole parameters include uncoupling coefficients ( K ), the empty hole diameter (), and hole spacing (). In simulations, when K exceeded 1.15, indicating the use of uncoupling charge, both the rock damage scope and the blast shock wave transmission were significantly suppressed. In contrast, the coupled charge ( K = 1.0) demonstrated better performance in promoting damage. Additionally, large‐diameter empty holes ( = 8 or 10 cm) showed pronounced free surface effects on the facing‐blasting side, completely breaking the rock mass between the charge hole and the empty holes and effectively guiding crack propagation on the back‐blasting side. Hole spacing had an inhibitory effect on effective plastic strain near empty holes; the optimal value is 14 cm. Finally, field tests were conducted, and the results revealed that the suggested cut‐hole parameters enhanced cycle advancement and borehole utilization by 9.0% and 12.3%, respectively, while reducing the powder factor by 27.4%. These findings provide valuable insights for similar underground engineering applications.
DOI: 10.1002/dug2.70016
Authors: Junjie Zhao, Diyuan Li, P. G. Ranjith, Xinxin Lü, Yanliang Li, Xiaoli Su
Institutions: Central South University, Monash University, Jilin University
Language: English
Topic: Blasting Impact and Analysis
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: diamond
Award: G1167414316
OpenAlex ID: W4409403091