基于精确矿物晶体模型的玄武岩宏观力学性质及波速分析  

Investigate the macroscale mechanical property and wave velocity of basalt based on accurate grain-based model

作　　者：张俊楷 乔江美 倪祖甲 唐旭海 严成增 ZHANG Junkai;QIAO Jiangmei;NI Zujia;TANG Xuhai;YAN Chengzeng(Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]中国地质大学工程学院,湖北武汉430074 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《岩石力学与工程学报》2025年第2期442-458,共17页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(12172264);深圳市科技计划资助(JCYJ20220530140602005,JCYJ20230807090102006)~~。

摘　　要：玄武岩工程应用广泛,从矿物晶体尺度出发研究玄武岩的宏观力学性质及波速具有重要意义。基于自主搭建的微观岩石力学试验系统,通过光学显微镜、全自动矿物分析仪、纳米压痕仪及原子力显微镜,分析玄武岩的矿物组成、微观结构、成岩矿物晶体及晶间相力学性质。基于获得的微观参数,建立玄武岩精确矿物晶体模型。通过矿物晶体尺度单轴压缩模拟,分析玄武岩应力演变全过程,得到玄武岩宏观弹性模量为53.59 GPa,抗压强度为166.84 MPa,与宏观试验得到的宏观力学性质误差较小。通过矿物晶体尺度波速模拟,分析玄武岩中波速传播全过程,得到玄武岩纵波波速值为5.71 km/s,与测试得到的纵波波速值5.13 km/s相符。证明基于微观岩石力学试验结果,建立精确矿物晶体模型,从矿物晶体尺度出发,获得任意尺寸、形状岩石宏观力学性质及波速的准确性。该方法填补从矿物晶体尺度出发研究玄武岩宏观力学性质及波速响应的空白,提供岩石跨尺度研究思路,为玄武岩的工程应用提供理论指导。Basalt has extensive engineering applications,and studying its macroscale mechanical properties and wave velocity from the mineral crystal scale is of significant importance.Using a self-built microscale rock mechanics experimental system,including optical microscopy,tescan integrated mineral analyser,nanoindentation,and an atomic force microscope,this paper analyzes the mineral composition,microstructure,mineral crystals,and interphase mechanical properties of basalt.Based on the obtained microscale parameters,an accurate grainbased model of basalt was established.Through uniaxial compression simulations at the mineral crystal scale,the entire stress evolution process of basalt was analyzed,resulting in a macroscale elastic modulus of 53.59 GPa and a compressive strength of 166.84 MPa,which are in good agreement with experimental results.Additionally,wave velocity simulations at the mineral crystal scale were conducted to analyze the entire wave propagation process in basalt,and the P-wave velocity was calculated as 5.71 km/s,which is consistent with the measured P-wave velocityof 5.13 km/s. This paper demonstrates that obtaining macroscale mechanical properties and wave velocities of anysize and shape rock from the mineral crystal scale is effective,based on the establishment of an accurate grainbasedmodel using microscale rock mechanics experimental results. This method fills the gap in studying themacroscale mechanical properties and wave velocity response of basalt from the mineral crystal scale,providing across-scale research approach,and offering theoretical guidance for the engineering applications of basalt.

关 键 词：岩石力学 玄武岩 微观岩石力学试验 精确矿物晶体模型 宏观力学性质 波速 

分 类 号：TU45[建筑科学—岩土工程]