岩土力学 ›› 2022, Vol. 43 ›› Issue (5): 1157-1163.doi: 10.16285/j.rsm.2021.1342

• 基础理论与实验研究 •    下一篇

基于微观岩石力学试验和NWA13618陨石的 小行星岩石力学参数分析

唐旭海1,许婧璟1,张怡恒1,何琦2,王正直1,张国平3,刘泉声1   

  1. 1. 武汉大学 土木建筑工程学院,湖北 武汉 430072;2. 中国地质大学(武汉) 行星科学研究所,湖北 武汉 430074; 3. 马萨诸塞大学阿默斯特分校 土木与环境工程系,美国 阿默斯特
  • 收稿日期:2021-08-14 修回日期:2021-12-20 出版日期:2022-05-11 发布日期:2022-04-30
  • 通讯作者: 张怡恒,男,1996年生,硕士,主要从事岩土工程方面的研究工作。E-mail:zhangyiheng@whu.edu.cn E-mail:xuhaitang@whu.edu.cn
  • 作者简介:唐旭海,男,1984年生,博士,教授,博士生导师,主要从事岩土工程方面的研究工作。
  • 基金资助:
    国家自然科学基金(No. 12172264)

Determining mechanical parameters of asteroid rocks using NWA13618 meteorites and microscopic rock mechanics experiment

TANG Xu-hai1, XU Jing-jing1, ZHANG Yi-heng1, HE Qi2, WANG Zheng-zhi1, ZHANG Guo-ping3, LIU Quan-sheng1   

  1. 1. School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China; 2. Planetary Science Institute, China University of Geosciences, Wuhan, Hubei 430074, China; 3. Department of Civil and Environmental Engineering, University of Massachusetts Amherst, Massachusetts, USA
  • Received:2021-08-14 Revised:2021-12-20 Online:2022-05-11 Published:2022-04-30
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (12172264).

摘要: 未来人类的地外天体勘探、太空资源开发、地外基地建设等活动都离不开岩土工程技术的发展。目前,人类获得太空岩石样本仅有太空飞行器取样和收集陨石两种途径。由于陨石存量稀少、价格昂贵、尺寸小并且形状任意,因此难以加工成传统力学试验与模拟(mechanical testing & simulation,简称MTS)材料试验机等宏观岩石力学试验所需要的高质量标准岩样。基于微观岩石力学试验和统计分布模型,发展了适用于小尺寸陨石的力学参数测量新技术。首先,应用矿物自动定量分析系统(TESCAN integrated mineral analyzer,简称TIMA)获得NWA13618陨石成岩矿物组成、含量和分布。然后,利用网格纳米压痕技术进行大量压痕试验获得多点弹性模量;之后,利用高斯混合模型,统计求解NWA13618陨石中4种主要矿物的力学参数。橄榄石、辉石、铁镍金属、长石的弹性模量分别为116.73、101.77、87.24、70.74 GPa;最后,基于岩石力学试验结果,采用Mori-Tanaka均质化方法获得NWA13618陨石宏观cm尺度弹性模量为90.48 GPa。提出的微观岩石力学试验技术和尺度升级方法为预测L4型陨石母星小行星的力学性质提供了理论基础和技术手段。

关键词: 太空采矿, 太空岩石力学, 纳米压痕, 小行星, 陨石, 跨尺度

Abstract: In the future, the extraterrestrial human activities, such as resources exploitation and base construction beyond earth need the aid of geotechnical engineering technology. Currently, there are only two approaches for humans to obtain the rock samples beyond earth: sample-return activities by spacecraft and meteorite survey. Meteorites are rare, expensive, small in size and arbitrary in shape, so it is difficult to process them into standard rock samples required by mechanical testing & simulation (MTS) and other traditional macroscopic rock mechanical tests. In this paper, a novel technique for measuring mechanical property of small-size meteorites is developed based on microscopic rock mechanics experiments (micro-RME) and statistical probability models. Firstly, the composition, content and distribution of NWA13618 meteorite rock-forming minerals were obtained by TESCAN integrated mineral analyzer(TIMA). Then, the nanoindentation technology was used to carry out a large number of indentation tests to obtain the multi-point elastic modulus. After that, the mechanical parameters of four main minerals in meteorite NWA13618 were derived by using Gaussian mixture model, and the elastic moduli of olivine, pyroxene, Fe-Ni and feldspar were 116.73, 101.77, 87.24 GPa and 70.74 GPa, respectively. Finally, the macroscopic cm-scale elastic modulus of NWA13618 meteorite determined by the homogenization method Mori-Tanaka model was 90.48 GPa according to the mineral content and mechanical properties. The novel micro-rock mechanical experiment technique and scale upgrading method proposed in this paper provide theoretical basis and technical means for predicting the mechanical properties of L4 parent asteroid.

Key words: space mining, space rock mechanics, nanoindentation, asteroid rock, meteorite, cross-scale

中图分类号: 

  • TU 457
[1] 张 帆,胡 维,郭翰群,胡大伟,盛 谦,邵建富,. 热处理后花岗岩纳米压痕试验研究[J]. , 2018, 39(S1): 235-243.
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