论文部分内容阅读
基于基坑开挖侧向减载的应力路径,选取武汉地区具有代表性的粉质粘土进行了排水条件下真三轴试验和普通三轴固结剪切试验,得出基坑侧向土体在不同应力状态下的应力与应变、轴向应变与水平向应变和轴向应变与体积应变间的变化关系,并探讨了试验土体的强度变化规律,获得了卸荷土体参数。试验结果表明,相同应力条件下,不同应力状态的土体变形特性不同,在实际开挖围护工程中应根据卸荷土体的实际受力状态考虑采用不同的设计方法和围护体系。
Based on the stress path of lateral load shedding in foundation pit excavation, the true triaxial test and ordinary triaxial consolidation shear test under drained condition were selected from the representative silty clay in Wuhan. The results showed that lateral soil The relationship between stress and strain, axial strain, horizontal strain, axial strain and volume strain under different stress states is discussed. The variation of strength of test soil is discussed and the parameters of unloading soil are obtained. The test results show that under the same stress conditions, the deformation characteristics of soils under different stress states are different. In the actual excavation envelope protection, different design methods and enclosure systems should be considered according to the actual stress state of unloading soil.