爆炸荷载下钢板对盾构隧道结构加固作用模拟与分析

Analysis of steel plate reinforcement to shield tunnel structures under blast loading

旨在模拟盾构隧道结构在简化爆炸荷载下的位移响应，进一步研究和分析混凝土管片衬砌内部粘贴钢板对隧道所起的加固作用。采用ANSYS／LS—DYNA进行数值模拟，用简化的三角形爆炸荷载对加固前后的管片结构进行冲击加载，对比研究了管片的位移时程情况，进一步分析了粘结抗剪切刚度、钢板厚度对加固效果的影响。结果表明：钢板加固可以明显地减小结构的位移响应；钢板厚度以及钢板与管片之间的粘结性能均是影响加固效果的关键因素；在技术可行的条件下，通过提高粘结性能来增强加固作用更为经济合理。

A simulation on the displacement response of a tunnel structure subjected to simple blast loading is made to research the effects of steel reinforcement on concrete shield tunnel structures. A triangular blast load is applied to the structure before and after reinforcement generated by dynamical analysis software ANSYS/LS-DYNA. The dis- placement responses are compared to study the effects of bonding shear stiffness and thickness. The results show that steel plate reinforcement effectively reduces the displacement. Thickness and shear stiffness are the critical factors. Increasing the shear stiffness seems to be a more economic way.