甘肃定西Q3原状黄土抗拉强度研究

Study on Tensile Strength of Original Loess in Lanzhou,Gansu

基于甘肃定西王家沟隧道原状黄土的竖直向和水平向取样,采用轴向劈裂试验探究原状黄土在各向异性的条件下与不同加载速率、不同加载圆柱直径、不同试样高度3方面的因素进行抗拉特性的分析。研究表明:原状黄土竖直向取样的抗拉性要优于水平向取样;在任意加载速率条件下,贯入深度与抗拉强度整体呈线性关系时抗拉强度越大;水平向试样的抗拉强度与加载圆柱的直径具有较强的线性关系;选试样高度为6~7 cm竖直向原状黄土研究抗拉特性较优。

Using the vertical and horizontal sampling of the original loess of Wangjiagou Tunnel in Lanzhou,Gansu Province,the paper analyzed tensile properties of undisturbed loess under anisotropic conditions with different loading rate,different loading diameter and different specimen height by fracturing test.The study shows that the tensile strength of the vertical sampling of undisturbed loess is better than that of horizontal sampling;under the condition of arbitrary loading rate,the tension of the specimen penetration depth and tensile strength is closer to the linear relationship.The tensile strength of the horizontal specimen has a strong linear relationship with the diameter of the loaded cylinder.The selected specimen height of 6 cm to 7 cm vertical to undisturbed loess as one of the factors to study the tensile properties of the better.