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<p>To investigate the influence of weak interlayers on the mechanical properties and energy evolution mechanism of gently inclined slate under deep high-strain conditions, this study takes a deep phosphor mine in Guizhou Province as the engineering background. Through on-site sampling, rock samples including interlayers and those without interlayers were prepared. The Zts-844 type triaxial unequal-direction stress unloading test system was used to conduct triaxial loading and acoustic emission tests. The results show: (1) The peak strength, peak axial strain, and elastic modulus of both types of rock samples increase with the increase of confining pressure, while the Poisson’s ratio decreases. (2) In terms of energy evolution, the rock sample without interlayers shows typical brittle failure energy response under low confining pressure; the dissipated energy ratio increases from 21.08% at 5&#xa0;MPa to 48.66% at 15&#xa0;MPa. The rock sample with interlayers exhibits a sharp increase in dissipated energy under high confining pressure, reaching 83.60% at 15&#xa0;MPa, and the total energy is 2.63 times that of the sample without interlayers. (3) The acoustic emission characteristics show that the maximum ringing count and maximum energy of the rock sample with interlayers are lower than those of the rock sample without interlayers, but the cumulative ringing count and cumulative energy are higher than the latter. The research results can provide a theoretical basis for the stability analysis and instability warning of gently inclined overburden rock with weak interlayers in deep mines.</p>

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Experimental Study on Mechanical Properties and Energy Evolution of Inclined Slate with Weak Interlayers under Different Confined Pressures

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Wei Chen,
  • Xiaofan Wu,
  • Wen Wan,
  • Yanlin Zhao,
  • Bowen Liu,
  • Jiayu Bao,
  • Jie Liu,
  • Junjie Huang,
  • Zhenhua Ren,
  • Xuanming Ding,
  • Yuanzeng Wang

摘要

To investigate the influence of weak interlayers on the mechanical properties and energy evolution mechanism of gently inclined slate under deep high-strain conditions, this study takes a deep phosphor mine in Guizhou Province as the engineering background. Through on-site sampling, rock samples including interlayers and those without interlayers were prepared. The Zts-844 type triaxial unequal-direction stress unloading test system was used to conduct triaxial loading and acoustic emission tests. The results show: (1) The peak strength, peak axial strain, and elastic modulus of both types of rock samples increase with the increase of confining pressure, while the Poisson’s ratio decreases. (2) In terms of energy evolution, the rock sample without interlayers shows typical brittle failure energy response under low confining pressure; the dissipated energy ratio increases from 21.08% at 5 MPa to 48.66% at 15 MPa. The rock sample with interlayers exhibits a sharp increase in dissipated energy under high confining pressure, reaching 83.60% at 15 MPa, and the total energy is 2.63 times that of the sample without interlayers. (3) The acoustic emission characteristics show that the maximum ringing count and maximum energy of the rock sample with interlayers are lower than those of the rock sample without interlayers, but the cumulative ringing count and cumulative energy are higher than the latter. The research results can provide a theoretical basis for the stability analysis and instability warning of gently inclined overburden rock with weak interlayers in deep mines.