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<p>With regard to the critical challenge of blast-induced damage control in jointed and fractured rock, this study systematically investigated the mechanical response characteristics of cement-filled joints under blasting load through model experiments. Simultaneous acoustic wave testing and vibration velocity monitoring were performed on a specialized vibration platform where the prepared cement-filled joint specimens underwent a blasting experiment. After the blasting, a shear experiment was conducted. Based on a systematic comparative analysis, the experimental results indicate that the shear strength of the cement-filled joint was influenced by the rock type, grouting age, and vibration velocity. Compare with the hard rock, additional tensile damage occurred internally in the soft rock. Under blasting vibration, the cohesion of cement-filled joint decreased significantly with an increase in PPV. The cohesion reduced by 15.71% and 14.82% in granite and sandstone, respectively, under a vibration velocity of 26.82&#xa0;cm/s and by 9.35 and 5.35%, respectively, under a vibration velocity of 14.82&#xa0;cm/s. And the cohesion of cement-filled joints increased with the grouting age. These observations enabled a quantitative evaluation of the post-blasting strength degradation in cement-filled joints and the establishment of a theoretical foundation for optimizing the excavation design scheme for jointed rock.</p>

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Experimental Investigation on the Mechanical Characteristics of Cement-Filled Joint under Blasting Load

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Ke Deng,
  • Jiajia Gao,
  • Yong Fan,
  • Guangdong Yang,
  • Ming Chen,
  • Wenbo Lu

摘要

With regard to the critical challenge of blast-induced damage control in jointed and fractured rock, this study systematically investigated the mechanical response characteristics of cement-filled joints under blasting load through model experiments. Simultaneous acoustic wave testing and vibration velocity monitoring were performed on a specialized vibration platform where the prepared cement-filled joint specimens underwent a blasting experiment. After the blasting, a shear experiment was conducted. Based on a systematic comparative analysis, the experimental results indicate that the shear strength of the cement-filled joint was influenced by the rock type, grouting age, and vibration velocity. Compare with the hard rock, additional tensile damage occurred internally in the soft rock. Under blasting vibration, the cohesion of cement-filled joint decreased significantly with an increase in PPV. The cohesion reduced by 15.71% and 14.82% in granite and sandstone, respectively, under a vibration velocity of 26.82 cm/s and by 9.35 and 5.35%, respectively, under a vibration velocity of 14.82 cm/s. And the cohesion of cement-filled joints increased with the grouting age. These observations enabled a quantitative evaluation of the post-blasting strength degradation in cement-filled joints and the establishment of a theoretical foundation for optimizing the excavation design scheme for jointed rock.