风砂土基本性质及其与土工格栅作用试验

对库布齐沙地、毛乌素沙地和腾格里沙地的调查和现场采取土样，试验测试了风砂土的物理力学性质指标和矿物化学成分，研究并提出了库布齐和腾格里风砂土粒度成分、化学成分的同一性，以及与毛乌素风砂土的差异性，这是由于土的成因与环境条件所至。对比分析了天然重度与干重度相差很小，最疏松状态下和最密实状态下干重度的也较接近，可用于控制填土密实度。在直剪摩擦和拉拔摩擦试验基础上，研究了土工格栅加筋风砂土产生的φ值和具有类似内聚力的c值，土工格栅与土摩擦形成的复合材料改善和增强了力学与工程性能的原因以及土工格栅所起的作用。

Tests on Basic Properties of Aeolian Sand and Geogrid Reinforced Aeolian Sand

Engineering research in aeolian sand environment has important significance to the regional economy development. This paper, taking the sandlands on Ordos Plateau and Alxa Plateau as test sites, studied the physical and mechanics property of aeolian sandy soil. The soil samples from Hobq sandland and Tengger sandland are uniform on granularity and chemical components because of the similar genesis and environment condition of aeolian sand. Samples from Mu Us Sandland have some differences with that from these two sandlands in granularity and chemical components. Comparison test showed that the shear stress of these three type sands is relative high; the natural and the dry weigh are about the same; the dry density both in the loosest and the densest states also have small differences. It can control the compactness of earth\|fill engineering. According to direct shear friction test and pullout friction test, it was proved that the compound material of geogrid and aeolian sand had reinforced the mechanics and engineering function of aeolian sand.