盾构管片衬砌纵向非均质等效连续模型

将盾构管片沿纵向分为环缝影响范围内、外两部分,环缝影响范围外取管片实际刚度,环缝影响范围内取等效刚度,环缝影响范围内、外连接处为刚性连接,推导出环缝影响范围内等效轴向刚度和等效弯曲刚度,并与等效连续均质模型的计算结果进行对比分析。提出了等效剪切刚度的概念。剪切刚度首先由管片接触面摩阻力提供,当剪切位移增大到螺栓与螺栓孔接触时螺栓参与抗剪,并推导出等效剪切刚度和剪切位移的计算式。讨论了环缝影响长度对各等效刚度的影响。

Longitudinal Heterogeneous Equivalent Continuous Model for Stagger Joint Segmental Lining

Segmental lining is divided into two parts in and out of the influence range of circumferential joint along longitudinal direction,the stiffness of segmental lining in this influence range is the actual value,but it is the equivalent value when out of the influence range of circumferential joint,the coupling in and out of the influence range is regarded as rigid coupling.By using analytical method,the equivalent axial and bend stiffness in the influence range of circumferential joint are deduced,the longitudinal heterogeneous equivalent continuous model is compared with the homogeneous equivalent model.On this basis,the concept of equivalent shear stiffness is put forward,which holds that the shear stiffness is carried by frictional resistance firstly with the evolution of shear displacement,the bolt will carry part of the shear stiffness when bolt touches with bolt hole.Thus the calculation formulas of equivalent shear stiffness and shear displacement are deduced,and the relationship between the influence range of circumferential joint and equivalent stiffness is illustrated.