唐垚,朱星,王惠明,吴述彧

• 1:地质灾害防治与地质环境保护国家重点实验室(成都理工大学)
• 2:水电水利规划设计总院有限公司
• 3:中国电建集团贵阳勘测设计研究院有限公司

摘要(Abstract)：

【目的】为探究砂岩失稳破坏灾变前兆信息，【方法】采用MTS刚性压力机开展了砂岩单轴加载试验，利用声发射监测系统对加载全过程进行实时探测，并对加载过程中砂岩的弹性应变能、耗散应变能、损伤变量演变特征进行详细分析。此外，基于灰色-尖点突变理论构建了声发射能量参数的尖点突变模型，系统分析了岩样失稳破坏过程中分叉集的响应特征。【结果】结果显示：在耗散能的驱动下，岩体出现损伤破裂，储能能力降低，且岩体能量、强度以45°裂缝倾角为转折点，随裂缝倾角的增加出现先减少后增大的现象。在塑性变形阶段，分叉集出现明显的突变，突变点对应的前兆应力大多占峰值应力的比例达75%以上，对应的前兆时间占失稳时间的比例达75%以上。【结论】结果表明：在耗散应变能的驱动下，岩样进入塑性变形阶段，岩样系统的状态也由稳定向非稳定转变，并在灾变前分叉集判别指标F出现突变，揭示了分叉集判别指标F作为岩体失稳前兆指标具有较强的普适性和较好的时效性。

关键词(KeyWords)： 能量释放;声发射;灰色-尖点突变理论;前兆信息

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(41877254);; 中国电建集团科技项目(DJ-ZDXM-2020-3);; 第二次青藏高原综合科学考察研究项目(2019QZKK0201)

作者(Author): 唐垚,朱星,王惠明,吴述彧

DOI: 10.13928/j.cnki.wrahe.2023.08.016

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