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流变扰动效应下红砂岩敏感邻域范围试验研究

Experimental study on the sensitive neighboring area range of red sandstone under rheological disturbance effect

  • 摘要: 深部岩体受到“强扰动”和“高地压”的影响,失稳致灾的风险逐渐增加。开展流变扰动效应理论研究是深部岩体稳定性控制的关键环节。其中,岩石流变扰动效应敏感邻域范围的识别与分析是重要组成部分。本研究在不同围压条件下通过细分红砂岩流变的轴向应力等级,选取岩石流变扰动效应下具有标志性的累计残余变形发展阶段(衰减阶段、近似等速阶段及加速阶段),结合流变扰动效应下其与岩石微观孔隙结构动力响应的一致相关性,多角度分析红砂岩流变扰动效应敏感邻域的演化特征。研究结果表明:① 在不同围压条件下,红砂岩流变扰动累计残余变形的发展阶段表现出与静态流变相似的特征。随着围压的增加,其不同阶段的反应特征和速率都会发生显著变化,从而对岩体的稳定性和强度产生一定影响。② 利用岩石流变扰动敏感性相关系数,进一步将红砂岩流变扰动敏感邻域划分为弱敏感区和强敏感区,并指出弱敏感区应作为流变岩体稳定性防护的关键阶段。③ 综合不同围压条件下的宏微观损伤演化特征响应分析,围压增大会导致红砂岩流变扰动敏感邻域范围的收缩和弱敏感区间的减少,加速了向强敏感区的特征转化。同时,随着围压的增大处于强敏感邻域内红砂岩的破坏发育速率也随之增大。本研究通过岩石流变扰动效应下对红砂岩微观孔隙结构和宏观变形量动力响应的综合分析,多角度揭示红砂岩流变扰动效应敏感邻域的动态演化特征,为深部岩体的安全开采和稳定性评估提供理论依据。

     

    Abstract: Deep rock masses are increasingly at risk of destabilization and disaster due to “strong disturbances” and “high geostress”. Conducting rheological disturbance effect theoretical research is a key part of controlling the stability of deep rock masses. Among these, the identification and analysis of the sensitive neighboring areas affected by rock rheological disturbance effects is an important component. This study, under different confining pressure conditions, subdivides the axial stress levels of red sandstone rheology, selecting stages of cumulative residual deformation development under rock rheological disturbance effects (attenuation stage, near constant speed stage, and acceleration stage). It combines the consistency correlation between the rheological disturbance effects and the dynamic response of the micro-pore structure of the rocks, analyzing from multiple perspectives the evolutionary characteristics of the sensitive neighboring areas affected by red sandstone rheological disturbance. The results show: ① Under different confining pressure conditions, the development stages of cumulative residual deformation in red sandstone rheological disturbance show characteristics similar to static rheology. With the increase of confining pressure, the response characteristics and rates of different stages change significantly, thereby affecting the stability and strength of the rock mass. ② Using the rheological disturbance sensitivity correlation coefficient of the rocks, the sensitive neighboring areas of red sandstone rheological disturbance are further divided into weakly sensitive and strongly sensitive areas, and it is pointed out that the weakly sensitive area should be considered a key stage in the stability protection of rheological rock masses. ③ By integrating the response analysis of macro and micro damage evolution characteristics under different confining pressure conditions, an increase in confining pressure leads to a contraction of the range of red sandstone rheological disturbance sensitive neighboring areas and a reduction in the weakly sensitive intervals, accelerating the transformation towards strongly sensitive characteristics. At the same time, with the increase of confining pressure, the failure development rate of red sandstone in the strong sensitive neighborhood also increases. This study, through a comprehensive analysis of the dynamic response of the micro-pore structure and macroscopic deformation of red sandstone under rheological disturbance effects, reveals from multiple perspectives the dynamic evolutionary characteristics of the sensitive neighboring areas affected by red sandstone rheological disturbance effects, providing a theoretical basis for the safe mining and stability assessment of deep rock masses.

     

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