大断面类矩形盾构衬砌结构横向刚度有效率

基于大断面类矩形盾构隧道衬砌结构原型加载试验,通过在原型试验管片领域引入三维激光扫描设备获取管片内弧面三维形变数据,对类矩形盾构管片形变、横向和水平向横向刚度有效率进行研究.给出了自重状态和设计状态下类矩形盾构管片横向刚度有效率值,分析了类矩形盾构管片形变和横向刚度有效率随覆土埋深和侧压力系数增加的变化规律,揭示了极限破坏工况条件下管片结构形变和横向刚度有效率的两阶段线性特征.通过壳-弹簧模型详细对比了类矩形和圆形管片形变和横向刚度有效率的异同点,证明了结构自重在反映类矩形盾构管片整体结构刚度上的重要影响.

Effective Transverse Rigidity Ratios of Quasi Rectangular Shield Lining with a Large Cross Section

The 3D laser scanning technology was introduced for the first time to acquire the global deformation of the inner surface of segmental lining during prototype loading test on the quasi-rectangular shield lining with a large cross section. Based on the experimental data, the deformation and the effective transverse rigidity ratio of the lining structure were analyzed. The values of the deformation characteristics and the effective transverse rigidity ratios of the segmental lining in both vertical and horizontal directions in the dead weight and design state were determined as well. The variation of deformation and the effective transverse rigidity ratios with the burial depth and lateral earth pressure coefficient were obtained. The variation of deformation and effective transverse rigidity ratios with the buried depth in the limit failure state were shown to follow a double linear pattern. Finally, shell spring models were established to compare the similarities and differences of the deformations and effective transverse rigidity ratios between the quasi rectangular and circular tunnels in detail, and the significant influence of the deadweight on the overall structural stiffness was revealed.