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首页> 外文期刊>Journal of aerospace engineering >Mechanical Properties of QH-E Lunar Soil Simulant at Low Confining Stresses
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Mechanical Properties of QH-E Lunar Soil Simulant at Low Confining Stresses

机译：低围压下QH-E月球土壤模拟物的力学性能

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摘要

The low-moon gravity has a significant influence on the mechanical properties of lunar soils at low-stress levels. To better understand the shear strength and deformation behavior of lunar soils at low confining stress and to facilitate the modeling and simulation of lunar activities, a series of consolidated drained triaxial compression tests were performed on numerous samples of lunar-soil simulant developed by Tsinghua University, China (named as QH-E). Great care was taken to conduct the experimental studies at low confining stresses such that reliable results can be obtained. The measured data suggest that QH-E samples exhibited strain-softening behavior with typical residual shear strength behavior characteristics. It was also found the residual internal friction angle phi cs approximately 40 degrees, regardless of confining stress, sigma 3 and relative density, Dr, whereas the peak apparent cohesion intercept ca-p is not equal to zero owing to the nonlinear behavior of shear strength of QH-E. However, the residual value of apparent cohesion intercept ca-cs is equal to zero. The rate of change of dilatancy angle at low confining stress values is greater than those at the conventional confining stress values. Further, based on the measured data from this study, two empirical models were suggested to predict the tangent modulus E and shear modulus G of QH-E at low confining stress, and according to the prediction models for internal friction angle and dilatancy angle in the literature, the model parameters of QH-E at low confining stress were determined.
机译：低月球重力对低应力水平下的月球土壤力学性能具有重要影响。为了更好地了解月球土壤在低围压下的抗剪强度和变形行为，并简化月球活动的建模和模拟，对清华大学开发的大量月球土壤模拟物样品进行了一系列固结排水三轴压缩试验，中国（命名为QH-E）。在低围压下进行实验研究时要格外小心，以便可以获得可靠的结果。测量数据表明，QH-E样品表现出应变软化行为，具有典型的残余剪切强度行为特征。还发现残余内摩擦角phi cs约为40度，而与约束应力，σ3和相对密度Dr无关，而由于剪切强度的非线性行为，峰值表观内聚力截距ca-p不等于零。 QH-E。但是，表观凝聚力截距ca-cs的残值等于零。在低约束应力值下，扩张角的变化率大于常规约束应力值下的扩张角。此外，根据这项研究的实测数据，提出了两个经验模型来预测低围压下QH-E的切线模量E和剪切模量G，并根据模型中的内摩擦角和剪胀角预测模型。文献中，确定了低围压下QH-E的模型参数。

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