碎石土室内直剪试验研究

Study on Indoor Direct Shear Test of Gravel Soil

摘要: 碎石土大多具有良好的工程性质，所以对其展开研究，了解其特性就具有非常重要的意义。为了对碎石土的力学性质有一定研究，本文以云南玉溪海通县附近碎石土为对象，进行了碎石土强度稳定性分析。在现场取土，并进行密实度测试，后续通过室内试验获取土的天然含水率和干密度，开展大型直剪试验，研究不同干密度和含水率下，施加不同竖向荷载时碎石土抗剪强度系数黏聚力c和内摩擦角的变化趋势。结果表明，含水状态对碎石土剪应力-剪切位移关系曲线有显著影响，在相同条件下，碎石土抗剪强度随含水率和竖向压力的变化呈现出特定规律。

Abstract: Most of the gravel soil has good engineering properties, so it is of great significance to study it and understand its characteristics. In order to study the mechanical properties of the gravel soil, the strength and stability analysis of the gravel soil near Haitong County, Yuxi, Yunnan province. The soil was taken on site and the compaction test was conducted. Subsequently, the natural moisture content and dry density of the soil were obtained through indoor tests, and the large-scale direct shear test was carried out to study the change trend of the shear strength coefficient cohesion c and internal friction Angle under different vertical loads. The results show that the water content state has a significant effect on the shear stress-shear displacement relationship curve of gravel soil. Under the same conditions, the shear strength of gravel soil shows a specific rule with the change of water content and vertical pressure.