中文摘要：

在一系列控制吸力的非饱和压实土三轴剪切试验中，应用数字图像测量技术获得了避开端部效应影响的试样中部1／3区域的强度及变形试验数据。由试验结果对非饱和土p—q—s三维应力空间临界状态面与LC屈服面交线在p—q平面、q—s平面和s—p平面的投影曲线进行了研究，进而全面地描述了非饱和土三维应力空间中的临界状态面的合理形态，修正了Alonso模型中的临界状态线表达式并进行了验证。

英文摘要：

The digital image measurement technique is employed in a series of suction-controlled unsaturated compacted soil triaxial tests to get the strength and deformation test data of the middle part of specimens, avoiding the end effect. The projective shape of the spatial critical state lines on the three two-dimensional planes is further discussed, and the rational critical state surface shape of the unsaturated soil in the three-dimensional p-q-s space is fully demonstrated. The formula expression of the three-dimensional critical state surface in Alonso model is improved and also validated by use of the related data.