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<p>The dynamic response patterns and stress distribution characteristics of rock masses under grouting have long posed challenges in rock engineering. In this study, we propose a framework for analyzing the source mechanisms of rock mass fracturing based on microseismic responses observed during curtain grouting in a dam slope rock mass. By integrating microseismic monitoring, hybrid moment-tensor inversion, and stress-tensor inversion, we systematically characterize the source parameters and focal mechanisms of grouting-induced rock fractures. Subsequently, the fracturing and stress inversion results are validated using borehole coring and in-situ stress measurement techniques. The results show that, compared to post-grouting conditions, the grouting process significantly increases both the scale of rock fracturing and the level of stress release. During grouting, rock fracturing is dominated by shear and mixed-mode failure, primarily due to grouting-induced shear slip along pre-existing fractures. The stress inversion results indicate that the fracturing behavior of the rock mass is mainly controlled by the regional tectonic stress field, with the maximum principal stress oriented nearly horizontally during grouting. These findings provide important references for optimizing curtain grouting parameters and assessing rock mass damage.</p>

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Evolution of Source Mechanism and Local Stress Inversion During Grouting in a High-Steep Slope Based on Microseismic Monitoring

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Haiyang Liu,
  • Ke Ma,
  • Kaikai Wang,
  • Zhongxin Wang,
  • Haitao Ma

摘要

The dynamic response patterns and stress distribution characteristics of rock masses under grouting have long posed challenges in rock engineering. In this study, we propose a framework for analyzing the source mechanisms of rock mass fracturing based on microseismic responses observed during curtain grouting in a dam slope rock mass. By integrating microseismic monitoring, hybrid moment-tensor inversion, and stress-tensor inversion, we systematically characterize the source parameters and focal mechanisms of grouting-induced rock fractures. Subsequently, the fracturing and stress inversion results are validated using borehole coring and in-situ stress measurement techniques. The results show that, compared to post-grouting conditions, the grouting process significantly increases both the scale of rock fracturing and the level of stress release. During grouting, rock fracturing is dominated by shear and mixed-mode failure, primarily due to grouting-induced shear slip along pre-existing fractures. The stress inversion results indicate that the fracturing behavior of the rock mass is mainly controlled by the regional tectonic stress field, with the maximum principal stress oriented nearly horizontally during grouting. These findings provide important references for optimizing curtain grouting parameters and assessing rock mass damage.