摘要
玄武岩力学特性与未来海洋资源开采、探月工程和火星基地建设息息相关,由于深海和深空环境下获取完整岩心难度较大,难以通过传统宏观岩石力学试验来准确测定其力学参数。为此,基于微观岩石力学试验与精确矿物晶体模型(accurate grain-based modeling,AGBM),提出了一种适用于非标准尺寸和形状玄武岩样本的力学参数测试方法。利用矿物自动定量分析系统(TESCAN integrated mineral analyzer,TIMA)和纳米压痕测试,分别获取玄武岩的矿物成分、微观结构信息和成岩矿物的微观弹性模量。基于TIMA和纳米压痕得到的微观参数,构建玄武岩精确矿物晶体模型,通过数值模拟玄武岩单轴压缩过程得到玄武岩的宏观弹性模量,进而实现任意小尺寸玄武岩样本的弹性模量测定。研究表明,基于AGBM的数值模拟所得玄武岩弹性模量与宏观试验结果最为接近,显著优于传统的均质化方案,包括Voigt-Reuss-Hill方案、Mori-Tanaka方案及稀释方案。最后,讨论了晶间相力学性质、孔隙率及孔隙填充对AGBM模型尺度升级效果的影响。本研究为小尺寸非标准玄武岩样本的力学性质预测提供了技术支持。
Mechanical properties of basalt are crucial for future marine resource extraction,lunar exploration,and Mars base development.However,obtaining intact basalt cores is challenging due to the difficulties of sampling in deep-sea and deep-space environments,making it impractical to determine their mechanical properties using traditional macroscopic rock mechanics tests.In this study,a new method to get mechanical properties of non-standard basalt specimens based on microscopic rock mechanics experiments and accurate grain-based modeling(AGBM)is proposed.The TESCAN integrated mineral analyzer(TIMA)is used to analyze mineral composition and microstructure of basalt.Nanoindentation tests are used to obtain elastic moduli of rock-forming minerals.AGBM models of basalt are constructed based on digital images obtained by TIMA and mechanical parameters derived from nanoindentation.It is found that elastic moduli of basalt obtained through AGBM-based numerical simulations of uniaxial compression tests closely align with those from macroscopic experiments.In contrast,homogenization methods,including the Voigt-Reuss-Hill scheme,the Mori-Tanaka scheme,and the dilution scheme,show considerable discrepancies.Finally,the study examines the impacts of interphase mechanical properties,porosity,and pore filling on upscaling results of AGBM models.The proposed method provides an approach for predicting mechanical properties of basalt samples in arbitrary shapes and small sizes.
作者
齐姝霞
刘一苇
唐旭海
张俊楷
严成增
刘泉声
QI Shuxia;LIU Yiwei;TANG Xuhai;ZHANG Junkai;YAN Chengzeng;LIU Quansheng(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Wuhan University Shenzhen Research Institute,Shenzhen 518057,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)
出处
《岩土工程学报》
北大核心
2025年第9期1956-1966,共11页
Chinese Journal of Geotechnical Engineering
基金
中国博士后科学基金特别资助项目(2023TQ0247)
中国博士后科学基金面上项目(2023M732715)
国家资助博士后研究人员计划项目(GZB20230544)
广东省基础与应用基础研究基金项目(2023A1515111071,2024A1515011772)。
关键词
玄武岩
纳米压痕
多尺度
微观力学性能
尺度升级
basalt
nanoindentation
multi-scale
microscale mechanical property
upscaling method
