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中文摘要：
研究非饱和土的强度是非饱和土理论及其工程应用的首要问题,但因复杂应力状态下基质吸力的控制技术、量测技术和吸力平衡时间等原因,非饱和土真三轴试验研究的进展迟缓.在介绍非饱和土刚性真三轴仪、柔性真三轴仪和刚柔复合型真三轴仪的基础上,重点分析已有非饱和土刚性和柔性真三轴试验结果,总结现有非饱和土真三轴仪及其试验研究的不足,同时指出Mohr--Coulomb强度准则和外接圆Drucker--Prager准则对非饱和土真三轴试验结果的不适用性.应开展更多不同种类非饱和土的完整真三轴试验研究,特别是非饱和黏性土;应结合非饱和土的应力状态变量和强度特性,建立符合工程实际受力状况的非饱和土真三轴强度准则,完善非饱和土的理论基础.
英文摘要：
The unsaturated soil strength is the most important issue in the unsaturated soil theory and its engineering applications. But advances in the true triaxial tests of the unsaturated soils have been very slow due to the control-measurement technique and the balance time of the matric suction under complex stress states. This paper briefly reviews the rigid and flexible and compound true triaxial apparatuses and the existing true triaxial tests for the unsaturated soils. It is shown that both Mohr-Coulomb and circumscribed Drucker-Prager strength criteria are not valid for the true triaxial tests of the unsaturated soils. Different types of true triaxial tests should be conducted, particularly, for non-saturated clays. In order to improve the theoretical basis for the study of the unsaturated soils, a true triaxial strength criterion of the unsaturated soils in accordance with the actual stress conditions in the field should be established, based on the stress state variables and the strength characteristics of the unsaturated soils.
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