中文摘要：

通过对4种不同碳酸钙含量的黄土试样进行常规三轴试验，研究了黄土在不同初始含水率、不同围压、不同干密度下的强度特性，进而分析碳酸钙含量变化对土体强度特性的影响。结果表明：在不同干密度和含水率情况下，4种不同碳酸钙含量的黄土试样在不同围压水平下的应力—应变关系曲线均无峰值出现，属应变硬化型；在同一围压下，试样达到相同应变时，土样主应力差随着碳酸钙含量的减少而减小；黏聚力c和内摩擦角φ随含水率增大而减小，随着干密度的增大而增大；4种不同碳酸钙含量土样的黏聚力c和内摩擦角φ随含水率和干密度变化的趋势基本一致，说明碳酸钙含量的变化只是改变了抗剪强度指标的大小，并未对其变化特性产生影响；碳酸钙含量与黄土抗剪强度指标值的大小呈正相关关系，即碳酸钙含量越大强度指标值越大。

英文摘要：

The strength characteristics of loess under different initial moisture content, .confining pressure and dry density was studied through con- ducting triaxial test for loess with different calcium carbonate contents, thereby analyzing the influence of calcium carbonate contents on strength characteristics of loess. The analytical results indicate that ： at different confining pressure level, there is not any peak among all the stress-strain curves belonging to four kinds of soil samples with different calcium carbonate contents, which demonstrates that these curves are classified into strain hardening; at the same confining pressure level, principal stress difference decreases with the decline of calcium carbonate contents; cohesion c and internal friction angle 〈p rise with the decline of moisture content and the increase of dry density ; cohesion c and internal friction angle ~ of four soil samples change with moisture content and dry density, but their variation trends are similar in spite of possessing different calcium carbon- ate contents, which indicates variation of calcium carbonate contents only change the value of shear strength parameters, instead of influencing their variation characteristics ; shear strength parameters of loess are positively correlated with calcium carbonate contents.