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卸荷工程在实际中经常遇到,保持大主应力不变,减小小主应力是实际工程中可能存在的一种应力路径。针对武汉地区具有代表性的粉质黏土进行了真三轴试验,在分析大量试验数据的基础上,对其平面应变条件下的应力-应变关系、体应变-轴应变关系及反映侧向变形的泊松比进行了研究,完善了实用性强的适合于减P路径的饱和黏性土变形理论,为寻求开挖工程研究对实体工程的实用性奠定了基础。
Unloading project often encountered in practice, to maintain the main stress unchanged, to reduce the small principal stress is a possible practical engineering stress path. Based on the analysis of a large number of experimental data, a true triaxial test was carried out on representative silty clay in Wuhan. Based on the analysis of stress-strain relationship, strain-axis strain relationship and lateral deformation Poisson’s ratio was studied and the practical theory of saturated clay deformation suitable for P-less path was perfected. This study lays the foundation for the practical engineering of excavation engineering research.