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细粒含量能对砂土抗剪强度带来不同程度影响。通过对福建标准砂的细粒及粗粒通过不同比例混合成试样,分别进行100kPa、300kPa有效固结压力下的固结不排水常规三轴剪切试验。研究结果表明,在低围压和高围压下,剪切初期各试样的抗剪强度差异不大,发生应变硬化后,纯粗砂和纯细砂都具有很高的强度,但当饱和粗砂混有细砂时,由于细颗粒处于砂颗粒组成的骨架孔隙中起到近似于“滚珠”的作用,使得饱和粗砂的抗剪强度因细颗粒的增加引起了不同程度的降低。
The content of fine particles can affect the shear strength of sand in varying degrees. Through the mixing of fines and coarse grains of Fujian standard sand into test specimens by different ratios, the conventional unconsolidated triaxial shear tests under the effective consolidation pressure of 100 kPa and 300 kPa respectively were carried out. The results show that under low confining pressure and high confining pressure, there is no obvious difference in shear strength between specimens at the initial stage of shearing. After strain hardening, both coarse and fine sand have high strength. However, When coarse sand mixed with fine sand, the shear strength of saturated grit due to the increase of fine particles caused different degrees of reduction due to the effect of the fine particles in the skeleton pores composed of sand particles. .