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<p>End effects has always been a difficult problem to solve by mechanical testing equipment, and existing measures cannot solve. To explore its mechanism of action and response law, this paper studies the failure mechanism of rock material and the strength enhancement effect under the end effect from the perspective of self-locking principal. The results show that: (1) The end effect is an objective self-locking. The difference in the smoothness of the end face leads to different self-locking range of compression, which affects the rock damage form and increases disperse experimental results. (2) For the standard samples (50&#xa0;mm × 100&#xa0;mm), when the end face friction coefficient <i>f</i> &lt; 0.5, the rock failure form dominates by pure tensile failure; when <i>f</i> ≥ 0.5, the rock forms the tension + shear mixed failure mainly caused by shear failure; (3) The intensity enhancement effect caused by the end effect presents nonlinear and power exponential. Therefore, through introducing the end effect coefficient k, and set up the uniaxial compressive strength correction formula under the rock end effect, the true peak intensity obtained at completely constraint is about 90% of the test value; (4) By analysis and research, the fixed end of the specimen can be used, and the height of the original specimen can be increased by one time. The test result value is the real value of the rock specimen, which can effectively solve the impact of the end effect.</p>

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Mechanical Response of Rock End Effects Based on Self-Locking Behavior

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Qingci Qin,
  • Chaoquan Luo,
  • Fa Dong,
  • Zhiguo Chang

摘要

End effects has always been a difficult problem to solve by mechanical testing equipment, and existing measures cannot solve. To explore its mechanism of action and response law, this paper studies the failure mechanism of rock material and the strength enhancement effect under the end effect from the perspective of self-locking principal. The results show that: (1) The end effect is an objective self-locking. The difference in the smoothness of the end face leads to different self-locking range of compression, which affects the rock damage form and increases disperse experimental results. (2) For the standard samples (50 mm × 100 mm), when the end face friction coefficient f < 0.5, the rock failure form dominates by pure tensile failure; when f ≥ 0.5, the rock forms the tension + shear mixed failure mainly caused by shear failure; (3) The intensity enhancement effect caused by the end effect presents nonlinear and power exponential. Therefore, through introducing the end effect coefficient k, and set up the uniaxial compressive strength correction formula under the rock end effect, the true peak intensity obtained at completely constraint is about 90% of the test value; (4) By analysis and research, the fixed end of the specimen can be used, and the height of the original specimen can be increased by one time. The test result value is the real value of the rock specimen, which can effectively solve the impact of the end effect.