测定模拟月壤物理和力学性质的室内试验方法研究

Method of Laboratory Test on the Physical and Mechanical Properties of Lunar Soil Simulant

模拟月壤的物理和力学性质是月球科学研究的重要内容,但是由于模拟月壤具有含水率低、孔隙比大的特性,不易采用一般的室内土工试验方法进行测定。通过改进制样方法,即通过环刀和击实后试样高度严格控制模拟月壤试样的质量和密实度,得到了测定模拟月壤物理和力学性质较为准确的室内试验方法,并探讨了模拟月壤的抗剪强度指标与密实度和粒径的关系以及模拟月壤的含水率对其抗剪强度的影响。试验结果表明:模拟月壤的天然密度与粒径大小有关,其抗剪强度指标与密实度和粒径大小有关。该试验方法具有操作简单、准确性好、成本低的优点,也适用于其他与模拟月壤类似的低含水率、高孔隙比土样的物理和力学性质的室内测定。

The physical and mechanical properties of lunar soil simulant are an important part of the research.But carrying out tests on lunar soil simulant in conventional ways is hard owing to its low moisture content and high void ratio.This paper improves the method of preparing the soil samples by controlling the mass and relative density of the samples through cutting ring and compaction and obtains more accurate physical and mechanical properties by laboratory test.The paper also discusses the relationship between shear strength indices and compactness and particle size,and the influence of moisture content of the lunar soil simulant on shear strength.The results indicate that the density of lunar soil simulant is relevant to the particle size and shear strength is related to the relative density and particle size.The method is easier and cheaper and more accurate,and applicable to laboratory test for other soils with low moisture content and high void ratio like lunar soil simulant.