试样高度对粗粒土剪切性能的影响

Influence of Sample Height on Shear Properties of Coarse-grained Soil

为研究不同试样高度粗粒土剪切性能的差异,运用DHJ50-2型叠环式剪切试验机,对1~2mm粗粒土组成的3种干密度土样,在4种试样高度下进行直剪试验,探究试样高度改变对粗粒土剪切性能的影响。结果表明,不同试样高度粗粒土抗剪强度及其参数在边界摩擦和力链结构共同作用下呈波动变化;咬合力对尺寸变化更加敏感;不同试样高度的剪切曲线变化趋势一致;试样高度越大,剪缩量越大。研究结果为更全面解释尺寸效应下粗粒土剪切性能的变化奠定了基础。

In order to study the shear properties of coarse-grained soil with different sample height,DHJ50-2 type laminated shear tester was used to carry out direct shear test under conditions of 4 sample heights with 3 kinds of dry density for 1-2 mm coarse-grained soil.And the influence of sample height on the shear performance of coarse-grained soil was discussed.The results show that the shear strength and parameters of coarse-grained soil with different sample height fluctuate under the joint action of boundary friction and force chain structure;The resultant force is more sensitive to the size change;The shear curves of different sample heights have the same variation trend;The higher the sample height is,the larger the shear reduction.The results provide a reference for a more comprehensive interpretation of the change of shear properties of coarse-grained soil under the size effect.