段国勇,马如梦

• 1:三峡库区地质灾害教育部重点实验室(三峡大学)
• 2:三峡大学电气与新能源学院
• 3:防灾减灾湖北省重点实验室(三峡大学)

摘要(Abstract)：

【目的】自2003年开始蓄水以来，三峡库区水库地震的数量达到上万次，对比蓄水前后的地震数据变化可以看出，库水浸泡作用明显改变了水库地震区域灰岩的力学特性。为了研究长期库水浸泡作用对库区灰岩力学特性的影响，【方法】针对库区蓄水环境，开展了不同浸泡时长和不同孔隙水压对灰岩三轴压缩强度的影响试验，以及浸泡作用下灰岩孔隙率变化的电镜扫描分析。【结果】试验结果显示：在浸泡作用和三轴试验中考虑不同孔隙水压时，灰岩的三轴抗压强度呈现出短期浸泡时的强度增强现象，与一些水岩相互作用理论存在差异。基于这些差异，从宏观力学特性和微观结构的角度分析了灰岩损伤发展规律，提出了灰岩浸泡损伤-孔隙水压耦合模型，估算了在试验条件下使溶孔产生破裂的孔隙压力临界值，按照静水压力取孔隙压力值为地下5.6 km处，与三峡库区高桥断裂区域的水库地震震源深度较为吻合。【结论】水库地震区域灰岩的损伤并非单一的浸泡损伤，是耦合了孔隙率演变、孔隙压力变化、孔隙水形态演化等一系列复杂现象的破坏失效过程。研究成果可为水利工程中诱发地震的机理研究提供一定的理论参考价值。

关键词(KeyWords)： 水库地震;灰岩;浸泡损伤-孔隙水压耦合模型;力学性能;三峡水库库区;水利工程

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U2034203);; 防灾减灾湖北省重点实验室(三峡大学)开放基金(2022KJZ08)

作者(Author): 段国勇,马如梦

DOI: 10.13928/j.cnki.wrahe.2024.09.016

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