广西红粘土击实样强度特性与胀缩性能

通过对广西贵港红粘土重型击实样的室内试验研究，探讨了其力学特性、胀缩性能、孔径分布特征与含水量之间的关系。结果表明：干密度指标总体上能反映红粘土击实样的强度规律，但非饱和击实样强度峰值对应的含水量因基质吸力作用而偏小，饱和后土体由于吸水膨胀与基质吸力的消失，使得强度峰值对应含水量较饱和前明显增大，红粘土在最优含水量下压实，虽可获得很高的压实度，但饱和后的强度并非最大；红粘土击实样的胀缩性能主要由含水量决定，同时，受到干密度的影响；孔隙主要以孔径在0.01～0.05μm范围内的小孔隙为主，为进一步掌握红粘土的工程力学特性提供了帮助。

Strength properties and swelling-shrinkage behaviors of compacted lateritic clay in Guangxi

The relationships among mechanical indexes, swelling-shrinkage properties, pore size distributions and moisture contents of lateritic clay in Guigang of Guangxi Zhuang Autonomous Region, are discussed through experimental research on the heavy-pattern compacted samples. The results show that the dry density can reflect the strength rule of compacted lateritic clay as a whole, and the moisture contents of unsaturated compacted samples corresponding to the maximum of strength indexes are comparatively low because of the effect of matrix suction, while those after saturating increase obviously duo to water absorbing, swelling and the loss of matrix suction. For lateritic clay compacted under the condition of optimum moisture content, its strength is not the highest after saturation although a very high compaction degree is obtained. The swelling-shrinkage properties of compacted lateritic clay are mainly controlled by moisture content, and also affected by dry density. The pores of compacted lateritic clay are mainly small sizes in diameters from 0.01μm to 0.05μm, which is useful for the further mastery on the geotechnical properties of lateritic clay.