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<p>Rainfall and blasting are key factors affecting the long-term stability of high slopes with gently-inclined weak interlayers of carbonaceous shale. The study of shear creep characteristics and microstructure evolution of carbonaceous shale under rainfall and blasting is crucial for revealing the disaster-causing mechanism. Using the self-developed multi-field coupled shear creep testing system, shear creep tests and SEM tests on carbonaceous shale were conducted. The effects of dry–wet cycles and vibrations on the creep characteristics of carbonaceous shale were analyzed, and the creep failure evolution law of carbonaceous shale was obtained. The microstructure characteristics of the shear failure section were analyzed. The experimental results indicated that the synergistic effect of dry–wet cycles and vibrations has a more significant impact on the creep characteristics of carbonaceous shale than that of a single factor. Compared to scenarios without dry–wet cycles and vibrations, the combined effect of 8 wet-dry cycles and 24 vibrations resulted in a 46.1% increase in creep deformation, a 197% rise in the steady-state creep rate, and a 17.7% reduction in long-term strength. Dry–wet cycles leads to the “water absorption-dissolution → water loss-recrystallization → water absorption-re dissolution” of the cementitious materials, which destroys the internal structure of sample. Vibrations cause local stress concentration and and shearing of mineral particles, thereby destabilizing the creep rate. The dissolution and transport of cementitious materials during dry–wet cycles promote vibration-induced deformation. Simultaneously, microcracks generated by vibrations enhance water penetration during dry–wet cycles. The combination of the two factors further intensifies the creep deformation, leading to a sharp decrease in long-term strength and ultimately causing accelerated creep failure of the sample. The research can provide reference for the creep characteristics of soft rocks and test data for the disaster mechanism of slopes with gently-inclined weak interlayers. </p>

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Shear Creep Behaviors of Carbonaceous Shale: Equivalent Simulation of Engineering Geological Environment Coupling of Geostress-Rainfall-Blasting Disturbance

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Jing Li,
  • Bin Hu,
  • Jianlong Sheng,
  • Zhuoxi Zhong

摘要

Rainfall and blasting are key factors affecting the long-term stability of high slopes with gently-inclined weak interlayers of carbonaceous shale. The study of shear creep characteristics and microstructure evolution of carbonaceous shale under rainfall and blasting is crucial for revealing the disaster-causing mechanism. Using the self-developed multi-field coupled shear creep testing system, shear creep tests and SEM tests on carbonaceous shale were conducted. The effects of dry–wet cycles and vibrations on the creep characteristics of carbonaceous shale were analyzed, and the creep failure evolution law of carbonaceous shale was obtained. The microstructure characteristics of the shear failure section were analyzed. The experimental results indicated that the synergistic effect of dry–wet cycles and vibrations has a more significant impact on the creep characteristics of carbonaceous shale than that of a single factor. Compared to scenarios without dry–wet cycles and vibrations, the combined effect of 8 wet-dry cycles and 24 vibrations resulted in a 46.1% increase in creep deformation, a 197% rise in the steady-state creep rate, and a 17.7% reduction in long-term strength. Dry–wet cycles leads to the “water absorption-dissolution → water loss-recrystallization → water absorption-re dissolution” of the cementitious materials, which destroys the internal structure of sample. Vibrations cause local stress concentration and and shearing of mineral particles, thereby destabilizing the creep rate. The dissolution and transport of cementitious materials during dry–wet cycles promote vibration-induced deformation. Simultaneously, microcracks generated by vibrations enhance water penetration during dry–wet cycles. The combination of the two factors further intensifies the creep deformation, leading to a sharp decrease in long-term strength and ultimately causing accelerated creep failure of the sample. The research can provide reference for the creep characteristics of soft rocks and test data for the disaster mechanism of slopes with gently-inclined weak interlayers.