微生物加固模拟月壤强度特性试验研究
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重庆大学

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重庆英才计划优秀科学家项目(编号:cstc2021ycjhbgzxm0051)


Strength of Lunar Regolith Simulant reinforced by MICP
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Chongqing University

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    摘要:

    随着我国探月工程的不断推进,月球建造成为建设月球人类基地十分重要的技术环节。为探究微生物固化月壤作为建筑材料的潜力,本文通过微生物诱导碳酸钙沉淀(MICP)对CQU-L1和CQU-L2模拟月壤进行加固,对不同加固次数和不同胶结液(CS)浓度的固化模拟月壤进行了无侧限抗压试验,剪切波速试验及扫描电镜SEM微观观测。研究结果表明:随着MICP加固次数和胶结液浓度的增加,固化模拟月壤强度提升显著。相同加固次数下,固化模拟月壤强度随胶结液浓度的提升而提升,12次2.0 mol/L CS加固的样品峰值强度可达1.303MPa。土体剪切波速与无侧限抗压强度增加的趋势相似,最大剪切波速可达508 m/s。SEM试验结果表明:随着加固次数和胶结液浓度的增加,固化模拟月壤孔隙中形成更为明显的致密结构,并且碳酸钙以球霰石为主。本文提出了一种利用月壤资源进行月球建造的新路径,有望为未来月球基地建设提供技术支持。

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    With the continuous advancement of our country"s lunar exploration project, lunar construction has become a crucial technological aspect in establishing a human base on the Moon. In order to explore the potential of lunar regolith as a construction material, this study investigated the reinforcement of simulated regolith simulant CQU-L1 and CQU-L2 with Microbially Induced Calcium Carbonate Precipitation (MICP). Unconfined compressive strength tests, shear wave velocity measurement tests, and scanning electron microscope (SEM) tests were conducted on the MICP treated lunar regolith simulant with different reinforcement times and concentrations of cementing solution (CS). The research results indicate that with an increase in MICP reinforcement times and CS concentration, the strength of the cured lunar regolith simulant significantly improves. Under the same reinforcement frequency, the strength of the cured lunar regolith simulant increases with the increase in CS concentration. The peak strength of samples reinforced 12 times with 2.0 mol/L CS can reach 1.303 MPa. The trend of soil shear wave velocity is similar to the increase in unconfined compressive strength, with a maximum shear wave velocity of 508 m/s. SEM test results demonstrate that with an increase in reinforcement frequency and CS concentration, a denser structure forms in the pores of the cured lunar regolith simulant, and calcium carbonate shows vaterite type. This study provides a new approach to lunar construction using lunar resources and is expected to provide important technical support for future lunar base construction.

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  • 收稿日期:2024-06-03
  • 最后修改日期:2024-06-30
  • 录用日期:2024-07-03
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