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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。
In a series of triaxial shear tests of unsaturated compacted soil with controlled suction, the intensity and deformation test data in the middle 1/3 of the specimen avoiding the influence of end effect were obtained by digital image measurement technology. From the experimental results, the projection curves of p-q plane, q-s plane and s-p plane on the intersection of the critical state plane and the yield surface of p-q-s three-dimensional stress space in unsaturated soil are studied. The reasonable shape of the critical state surface in the three-dimensional stress space of unsaturated soil is modified and the critical state line expression in Alonso’s model is modified and validated.