loading page

Failure characteristics and stress wave propagation of red sandstone under explosion with varying gas energies
  • +6
  • Xiang Zhang,
  • Jun Chen,
  • Hui Yi,
  • Yang Yang,
  • Shizheng Fang,
  • Chengxiao Li,
  • Shulin Chen,
  • Derui Gao,
  • Zhijie Wang
Xiang Zhang
China University of Mining and Technology - Beijing
Author Profile
Jun Chen
China University of Mining and Technology - Beijing

Corresponding Author:[email protected]

Author Profile
Hui Yi
China University of Mining and Technology - Beijing
Author Profile
Yang Yang
University of Science and Technology Beijing School of Civil and Resources Engineering
Author Profile
Shizheng Fang
University of Science and Technology Beijing School of Civil and Resources Engineering
Author Profile
Chengxiao Li
China University of Mining and Technology - Beijing
Author Profile
Shulin Chen
Pangang Group Company Limited
Author Profile
Derui Gao
Pangang Group Company Limited
Author Profile
Zhijie Wang
Pangang Group Company Limited
Author Profile

Abstract

The blasting excavation process during underground rock mass engineering can induce severe stress disturbance, resulting in spalling and damage to the surrounding rock mass in the tunnels, which can seriously compromise the underground engineering construction. In the present work, an experimental blast loading device was developed to study the dynamic response of rocks under explosive loads, which could vary the utilization of explosive gas energy by changing the constraint conditions. The device employed a high-speed camera to record the stress wave propagation and failure characteristics on the surface of the specimen and verified the reliability of the experimental results using an ultra-dynamic strain gauge. The developed apparatus was used to explore the failure characteristics and stress wave propagation laws in red sandstone under different explosion gas energies. The complete process of stress wave propagation in red sandstone was captured under different explosive gas energies, from an intact form to failure, and the attenuation law of stress waves was obtained. The experimental results showed that when the explosive stress wave traversed through the specimen, it primarily experienced tensile strain, with maximum tensile strain observed at the free surface. The stress wave propagation in the specimen varied under different explosive loads, leading to varying overall failure characteristics of the specimen. The larger the amplitude of the stress wave, the greater the spatial attenuation coefficients of the compression wave and the tensile wave. The thickness of the spalling fracture was determined based on the wave width of the stress wave λ 1, the attenuation coefficient of the stress wave α, and the longitudinal wave velocity C 0. The closer the crack is to the bottom of the specimen, the smaller the thickness. The experimental results provide theoretical guidance to understand the strong dynamic disturbance behavior and progressive instability failure phenomenon in deep underground engineering.
10 Nov 2023Submitted to Fatigue & Fracture of Engineering Materials & Structures
14 Nov 2023Assigned to Editor
14 Nov 2023Submission Checks Completed
18 Nov 2023Reviewer(s) Assigned