Scholarlink

<p>The stability control of roadway surrounding rock is a hot issue in coal mining, it is of great significance to study the characteristics of surrounding rock and damage evolution mechanism under the influence of roadway excavation and mining disturbance. The RMT-150 testing machine was used to carry out the triaxial loading–unloading-uniaxial reloading mechanical characteristics test of the white sandstone specimen, the physical properties and mechanical response characteristics of the rock under different unloading points are analyzed systematically. Through monitoring the AE characteristics during rock loading, it was found that there is a close internal connection between AE and rock mechanical response. Based on the Weibull distribution function, the progressive damage evolution equation of rock was constructed, and the damage evolution law of rock under different unloading points was discussed, and the relationship between compressive strength and damage factor D of rock at different unloading points was analyzed. The results show that with an increasing degree of initial damage, the elastic modulus, deformation modulus and compressive strength of rock decrease nonlinearly, while the wave velocity and volume density first increase and then decrease; With an increasing initial damage degree, the failure modes of the rock vary during the uniaxial reloading process, it is manifested that high damage rock is ductile failure and low damage rock is brittle-ductile failure. The correlation between the acoustic emission amplitude and stress–strain curve is strong. The scale parameter m value can have an influence on the rock damage rate, when the morphological parameter ε<sub>0</sub> remains unchanged, as the scale parameter m value increases, the curve rotates counterclockwise around one certain point A; The initial damage degree of the rock under different unloading points is different. The higher the unloading point, the greater the initial damage degree, and the smaller the uniaxial compressive strength of the damaged rock. The model can predict the stability of the rock to some extent.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Mechanical Properties and AE Characteristics of White Sandstone with Prepeak Unloading Damage

  • 期刊论文

  • 发表日期：

    2025年1月18日

查看全文
  • Heng Ren,
  • Yongjian Zhu

摘要

The stability control of roadway surrounding rock is a hot issue in coal mining, it is of great significance to study the characteristics of surrounding rock and damage evolution mechanism under the influence of roadway excavation and mining disturbance. The RMT-150 testing machine was used to carry out the triaxial loading–unloading-uniaxial reloading mechanical characteristics test of the white sandstone specimen, the physical properties and mechanical response characteristics of the rock under different unloading points are analyzed systematically. Through monitoring the AE characteristics during rock loading, it was found that there is a close internal connection between AE and rock mechanical response. Based on the Weibull distribution function, the progressive damage evolution equation of rock was constructed, and the damage evolution law of rock under different unloading points was discussed, and the relationship between compressive strength and damage factor D of rock at different unloading points was analyzed. The results show that with an increasing degree of initial damage, the elastic modulus, deformation modulus and compressive strength of rock decrease nonlinearly, while the wave velocity and volume density first increase and then decrease; With an increasing initial damage degree, the failure modes of the rock vary during the uniaxial reloading process, it is manifested that high damage rock is ductile failure and low damage rock is brittle-ductile failure. The correlation between the acoustic emission amplitude and stress–strain curve is strong. The scale parameter m value can have an influence on the rock damage rate, when the morphological parameter ε0 remains unchanged, as the scale parameter m value increases, the curve rotates counterclockwise around one certain point A; The initial damage degree of the rock under different unloading points is different. The higher the unloading point, the greater the initial damage degree, and the smaller the uniaxial compressive strength of the damaged rock. The model can predict the stability of the rock to some extent.