柏明武,陈世万,左双英,魏元龙,田娇,田云雷

• 1:贵州大学资源与环境工程学院
• 2:喀斯特地质资源与环境教育部重点实验室
• 3:贵州工程应用技术学院土木建筑工程学院
• 4:自然资源部复杂构造区非常规天然气评价与开发重点实验室

摘要(Abstract)：

【目的】隧道损伤区范围及其损伤特征的精确表征对隧道工程岩体质量评价和围岩支护优化十分重要。【方法】以贵州桐梓隧道为研究对象，通过围岩钻孔岩芯精细编录、钻孔波速测试和钻孔电视摄影，获得围岩内开挖诱发裂隙分布及岩体波速劣化特征；并对不同钻进深度的岩芯开展核磁共振测试，认识损伤区岩芯细微观结构改变特征。【结果】结果显示，岩芯获得率在1.25倍洞径范围内降低，新生裂隙在1.25倍洞径范围内出现，岩体波速在0.4～0.6倍等效洞径范围内降低明显；孔隙率在0～3 m内急剧下降，该范围内大孔孔隙增大明显。【结论】对比多种理论强度计算的开挖损伤区范围结果发现，Hoek-Brown准则、统一强度理论和数值模拟计算获得的损伤区范围与实测结果一致，适用于灰岩体损伤强度理论计算。损伤范围判定的经验公式，获得了判定损伤区的指标，对定量判定灰岩隧道开挖损伤范围具有重要意义。

关键词(KeyWords)： 隧道;开挖损伤区;灰岩;新生裂隙;波速;影响因素

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(41902301,42162027);; 贵州省科技计划(黔科合重大专项字[2018]3011,[2022] 212)

作者(Author): 柏明武,陈世万,左双英,魏元龙,田娇,田云雷

DOI: 10.13928/j.cnki.wrahe.2024.05.007

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