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<p>In gob-side entry retaining, directional blasting is commonly used to pre-split hard roofs. However, the blasting impact often causes severe dynamic damage to the surrounding rock and filling walls. To investigate the dynamic response and stability of entry retaining under blasting roof cutting, a numerical model was established using Livermore Software Dynamics based on the geological conditions of the Daxing Coal Mine. The Johnson-Holmquist dynamic constitutive model was introduced to simulate the non-linear damage behavior of the rocks under explosive loads. The results show that the blasting disturbance significantly affects the roadway roof and filling wall, with the maximum roof displacement reaching 3.26 cm and a maximum tensile stress of 9.42 MPa generated at the upper part of the filling wall. Notably, the damage degree of the filling wall exhibits an exponential decay trend as the horizontal roof-cutting distance increases. Furthermore, a joint analysis combining the dynamic blasting disturbance and the static overlying strata pressure indicates that the combined stress on the filling wall reaches a minimum of 0.149 MPa at a horizontal cutting distance of 7 m. Therefore, 7 m is determined as the optimal roof-cutting distance. The findings provide a quantitative reference for the stability control of gob-side entry retaining under hard roof conditions.</p>

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Dynamic response and stability of gob-side entry retaining under blasting roof cutting

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Jihuan Han,
  • Qing Wu,
  • Changan Liu,
  • Jing Wang,
  • Zhixiang Huang,
  • Hailong Kong

摘要

In gob-side entry retaining, directional blasting is commonly used to pre-split hard roofs. However, the blasting impact often causes severe dynamic damage to the surrounding rock and filling walls. To investigate the dynamic response and stability of entry retaining under blasting roof cutting, a numerical model was established using Livermore Software Dynamics based on the geological conditions of the Daxing Coal Mine. The Johnson-Holmquist dynamic constitutive model was introduced to simulate the non-linear damage behavior of the rocks under explosive loads. The results show that the blasting disturbance significantly affects the roadway roof and filling wall, with the maximum roof displacement reaching 3.26 cm and a maximum tensile stress of 9.42 MPa generated at the upper part of the filling wall. Notably, the damage degree of the filling wall exhibits an exponential decay trend as the horizontal roof-cutting distance increases. Furthermore, a joint analysis combining the dynamic blasting disturbance and the static overlying strata pressure indicates that the combined stress on the filling wall reaches a minimum of 0.149 MPa at a horizontal cutting distance of 7 m. Therefore, 7 m is determined as the optimal roof-cutting distance. The findings provide a quantitative reference for the stability control of gob-side entry retaining under hard roof conditions.