余琪,陈世万,杨贵,刘家旭,叶建龙,田浪

• 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试验室(贵州大学)

摘要(Abstract)：

获得脆性相似材料是开展岩体工程脆性破坏相似模拟试验的前提。为研究配比、胶结材料、颗粒级配等因素对相似材料强度和脆性的影响及控制机制，采用声发射、核磁共振仪、电镜扫描等开展了系统试验。结果表明：(1)常规砂-水泥-石膏胶结的相似材料中水泥的占比是控制材料强度的关键因素，但配比改变对相似材料脆性影响不大。(2)加入水玻璃和石灰胶结材料的试样压缩全过程声发射显著增多，加入石灰或改善材料中骨料的颗粒级配可有效提高相似材料的脆性。(3)改善骨料颗粒级配的相似材料其单轴压缩全过程曲线及声发射特征与脆性岩石压缩全过程演化曲线及声发射特征相似，是用以模拟岩石脆性破坏过程及声发射演化的理想材料。(4)通过核磁共振与电镜扫描分析不同相似材料孔隙及胶结特征可知，相似材料孔隙量与孔隙结构与材料脆性密切相关；胶结材料对骨料颗粒包裹情况是材料脆性的重要决定因素。研究成果对岩土工程相似模拟试验具有参考价值。

关键词(KeyWords)： 崩塌;物理模型;声发射;相似材料;脆性指数

Abstract:

Keywords:

基金项目(Foundation): 贵州省科学技术基金项目([2020]1Y185);; 国家自然科学基金项目(4216020116)

作者(Author): 余琪,陈世万,杨贵,刘家旭,叶建龙,田浪

DOI: 10.13928/j.cnki.wrahe.2022.09.020

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