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<p>As underground engineering depths increase, the impact of in-situ stress on rock fracturing from blasting becomes more pronounced. To investigate the effect of in-situ stress on the fracture characteristics induced by blasting, a biaxial loading blasting experimental device to simulate the high in-situ stress environment of deep rock masses was developed in this paper. Experiments were conducted on granite samples with single, double, and three-hole blasting under confining pressures of 0, 5, and 10&#xa0;MPa. The cracking characteristics of the rock samples were analyzed. In addition, the acceleration, tangential strain, and radial strain were monitored to study the influence of confining pressures on the dynamic response induced by blasting. The experimental results indicate that the blast-induced fractures tend to propagate preferentially along the direction of linkage between blastholes. As the confining pressure increases, the number of rock cracks gradually decreases, their lengths shorten, and their widths narrow. Confining pressure significantly suppresses fracture formation and crack propagation between holes. Additionally, peak acceleration, tangential strain, and radial strain all decrease with rising confining pressure, with tangential strain more strongly affected. When the confining pressure increases from 0 to 10&#xa0;MPa, the tangential strain reduction rate ranges from 23.66% to 34.17% for single-hole blasting, from 26.82% to 42.26% for double-hole blasting. The research results provide an important experimental basis for a deeper understanding of the influence of confining pressure on the cracking characteristics induced by blasting under in-situ stress.</p><p><b>Highlights</b><UnorderedList Mark="Bullet"> <ItemContent> <p>Granite samples under different confining pressures were utilized in blasting experiments.</p> </ItemContent> <ItemContent> <p>Acceleration and dynamic strain time histories were captured during the blasting.</p> </ItemContent> <ItemContent> <p>Influence of confining pressures on the dynamic response induced by blasting was studied.</p> </ItemContent> <ItemContent> <p>Rock blasting cracking characteristics under different confining pressures were investigated.</p> </ItemContent> </UnorderedList></p>

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Influence of Confining Pressure on Granite Blasting Fracture: Insights From Physical Model Experiments and Numerical Simulations

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Yong Fan,
  • Jingao Wu,
  • Guangdong Yang,
  • Wenbo Lu,
  • Shengyong Ding,
  • Lehua Wang,
  • Bin Tian

摘要

As underground engineering depths increase, the impact of in-situ stress on rock fracturing from blasting becomes more pronounced. To investigate the effect of in-situ stress on the fracture characteristics induced by blasting, a biaxial loading blasting experimental device to simulate the high in-situ stress environment of deep rock masses was developed in this paper. Experiments were conducted on granite samples with single, double, and three-hole blasting under confining pressures of 0, 5, and 10 MPa. The cracking characteristics of the rock samples were analyzed. In addition, the acceleration, tangential strain, and radial strain were monitored to study the influence of confining pressures on the dynamic response induced by blasting. The experimental results indicate that the blast-induced fractures tend to propagate preferentially along the direction of linkage between blastholes. As the confining pressure increases, the number of rock cracks gradually decreases, their lengths shorten, and their widths narrow. Confining pressure significantly suppresses fracture formation and crack propagation between holes. Additionally, peak acceleration, tangential strain, and radial strain all decrease with rising confining pressure, with tangential strain more strongly affected. When the confining pressure increases from 0 to 10 MPa, the tangential strain reduction rate ranges from 23.66% to 34.17% for single-hole blasting, from 26.82% to 42.26% for double-hole blasting. The research results provide an important experimental basis for a deeper understanding of the influence of confining pressure on the cracking characteristics induced by blasting under in-situ stress.

Highlights

Granite samples under different confining pressures were utilized in blasting experiments.

Acceleration and dynamic strain time histories were captured during the blasting.

Influence of confining pressures on the dynamic response induced by blasting was studied.

Rock blasting cracking characteristics under different confining pressures were investigated.