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<p>The anchor injection joint reinforcement technique effectively deals with fissured rock masses in underground engineering. The current research on the mechanical properties and damage modes of fissured rock mass under static and dynamic loads with combined anchor-injection reinforcement is insufficient. For this reason, the present study adopts the method of combined anchor-injection reinforcement to carry out dynamic and static load tests under three-dimensional stress states on red sandstone masses containing prefabricated fissures to reveal the differences in the mechanical properties of the rock masses under dynamic and static stresses. The test resulted in the following: since the loading rates of the two loading tests and the simulated stress states are different, it leads to differences in the stress–strain curves under static and dynamic loads. Based on the strength evolution characteristics, a power function prediction model is proposed, in which the dynamic peak strength is represented by the static peak strength and strain rate. As the confining pressure increases, the dynamic peak strain decreases, the static peak strain increases, and both the dynamic and static secant modulus increase. The failure mode of the static load test samples is shear damage, and the failure mode of the dynamic load test samples is compression-shear damage.</p>

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Comparative study of mechanical properties and failure modes of anchor-grouting combined reinforcement red sandstone under three-dimensional dynamic and static loads

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Dafang Yang,
  • Shukai Chen,
  • Shuxue Ding,
  • Wenlin Feng,
  • Jiasai Li,
  • Shuai Gao

摘要

The anchor injection joint reinforcement technique effectively deals with fissured rock masses in underground engineering. The current research on the mechanical properties and damage modes of fissured rock mass under static and dynamic loads with combined anchor-injection reinforcement is insufficient. For this reason, the present study adopts the method of combined anchor-injection reinforcement to carry out dynamic and static load tests under three-dimensional stress states on red sandstone masses containing prefabricated fissures to reveal the differences in the mechanical properties of the rock masses under dynamic and static stresses. The test resulted in the following: since the loading rates of the two loading tests and the simulated stress states are different, it leads to differences in the stress–strain curves under static and dynamic loads. Based on the strength evolution characteristics, a power function prediction model is proposed, in which the dynamic peak strength is represented by the static peak strength and strain rate. As the confining pressure increases, the dynamic peak strain decreases, the static peak strain increases, and both the dynamic and static secant modulus increase. The failure mode of the static load test samples is shear damage, and the failure mode of the dynamic load test samples is compression-shear damage.