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Physical Model Tests of the Bearing Behavior of Tongji-1 Lunar Soil Simulant

机译：同济一号月球土壤模拟物承载行为的物理模型试验

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摘要

The new exploration programs of the Moon set up by various countries require a good understanding of the mechanical behavior of lunar soil, especially for the construction of facilities and the soft-landing process of lunar rovers. Plate load tests (PLTs) of lunar soil simulants are routinely used to gain accurate understanding of engineering properties of real lunar soil and to predict the load-settlement behavior of foundation systems on the Moon. In this paper, a test apparatus and testbed are carefully designed to account for the grain-size effect and boundary effect. A series of plate load tests of Tongji-1 lunar soil simulant (TJ-1 simulant) is conducted with a foot pad and four circular plates at different loading velocities using the strain-loading method (soft-landing process of a lunar rover). For comparison, tests using the stress-loading method are also carried out (traditional shallow foundation system). In addition, the experimental results are compared with those predicted by the Terzaghi and the modified Terzaghi methods. The results show that with the same loading method and loading velocity, the bearing capacity of TJ-1 simulant under a foot pad with top diameter Rt and bottom diameter Rb, can be estimated using the data under the plates with diameters Rt and Rb, whereas the deformation modulus is close to the data under the plate with diameter Rb; the values of ultimate bearing capacity and bearing capacity factor using the stress-loading method lie in the range of those using the strain-loading method at different velocities, whereas the values of the deformation modulus using the stress-loading method are larger than those using the strain-loading method; and the Terzaghi method overpredicts the bearing behavior of TJ-1 simulant, whereas the modified Terzaghi method underpredicts it. Hence, more experimental and engineering tests are required to find a better modified method.
机译：各国制定的新月球勘探计划要求对月球土壤的力学行为有充分的了解，尤其是在设施建设和月球漫游车的软着陆过程方面。通常使用月球模拟物的板载试验（PLT）来获得对实际月球土壤的工程特性的准确了解，并预测月球上地基系统的载荷沉降行为。在本文中，精心设计了一种测试设备和测试台，以考虑晶粒尺寸效应和边界效应。使用应变加载方法（月球车的软着陆过程），用脚垫和四个圆形板以不同的加载速度进行了同济一号月球模拟物（TJ-1模拟物）的一系列板载荷试验。为了进行比较，还使用应力加载方法进行了测试（传统浅基础系统）。此外，将实验结果与通过Terzaghi和改进的Terzaghi方法预测的结果进行了比较。结果表明，在相同的加载方法和加载速度下，可以使用直径为Rt和Rb的平板下的数据来估算TJ-1模拟物在顶部直径Rt和底部直径Rb的脚垫下的承载能力，而变形模量接近于直径为Rb的平板下的数据。应力加载法的极限承载力和承载力系数的值处于不同速度下的应变加载法的范围，而应力加载法的变形模量值大于应力加载法的变形模量值。应变加载方法； Terzaghi方法高估了TJ-1模拟物的承载性能，而改进的Terzaghi方法低估了它的表现。因此，需要更多的实验和工程测试来找到更好的修改方法。

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  • 来源
    《Journal of aerospace engineering》 |2019年第2期|04018150.1-04018150.9|共9页
  • 作者

    Jiang Mingjing; Xi Banglu; De Blasio Fabio V.; Lei Huayang; Sun Dean;

  • 作者单位

    Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China|Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, Dept Geotech Engn, Coll Civil Engn, Shanghai 200092, Peoples R China;

    Univ Milano Bicocca, Dept Earth & Environm Sci, I-20126 Milan, Italy;

    Tianjin Univ, Sch Civil Engn, Tianjin 300072, Peoples R China;

    Shanghai Univ, Dept Civil Engn, Shanghai 200072, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Lunar soil; Plate load test; Bearing capacity; Loading velocity;

    机译：月球土壤;板载试验;承载力;加载速度;

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