中文摘要：

粗粒土工程性质受其粗颗粒含量的影响,粗颗粒破碎后的级配重分布又会对其强度和变形产生影响.通过制备不同最大粒径组（≥40 ～60 mm）的土样进行三轴固结排水试验和压缩试验.试验结果表明：粗粒（≥40 ～60 mm）含量小于35％时,粗粒土的内摩擦角不受粗粒含量影响.黏聚力随着粗粒含量的增大呈现先增大后减小的变化趋势,当粗粒含量为25％左右时,曲线出现峰值,即粗粒含量达到25％时的黏聚力最大.增加最大粒径的含量有利于减小土的压缩性.三轴试验由于剪切作用使得颗粒破碎率较大,而固结试验即使垂直压力很大其破碎率也较小,表明颗粒破碎与剪切面的形成密切相关.

英文摘要：

Because of the large particles,the coarse granular soil has good engineer properties.Under the compression condition,the grain composition changed and this will affect the strength and deformation.Triaxial consolidation test and compression test were carried out on different samples with different large soil content.The experimental results showed that,when the content of coarse grain （≥40 ～60 mm） was less than 35%,the friction angle would not be affected.The cohesive strength increased first,and then decreased with the large particle content,the curve reached the peak when the content of large particles was 25%,that is,the cohesive strength was the maximum.Increasing the large particle content is good for reducing the compressibility of soil.Because of shearing,the breakage index is high in triaxial test,while the breakage index is small in compression test under the high pressure.