圆形隧道装配式衬砌接头刚度模型研究

A study on the stiffness model of circular tunnel prefabricated lining

接头刚度Kθ是装配式衬砌结构设计的一个重要参数。目前 ,Kθ的取值尚无现成的公式或图表可循 ,一般是根据接头受力试验确定。本文通过试验建立了接头的力学模型 ,该模型将接头衬垫和连接螺栓抽象成弹簧 ,根据衬垫材料的压缩回弹曲线 ,建立了接头受力和变形的非线性方程式。为了避免应用中求解非线性方程组 ,本文推导了接头刚度的简化计算公式。应用所建立的模型可以求解接头转角、接缝张开量、螺栓拉力等参数 ,通过与接头受力试验实测数据对比 ,证明计算值和实测值是吻合的。文中还应用模型对各种因素对接头刚度的影响规律进行了模拟 ,所得结果是合理的。

Joint stiffness K θ is an important parameter for the design of circular prefabricated lining. Presently, there is no perfect theoretical way but test to determine the value of K θ.This paper proposes a joint mechanical model, which substitutes the joint bolts and liner layers with springs. The non linear equations describing the relations between the force applied on the joint and the strain caused by the force is given. To avoid extracting the non linear equations, a simplified K θ equation is derived. The rotatory angle, tension width and bolts tensile force can be calculated from the model. The correspondence between theoretical value and test value proves the validity of the model. The effect of various factors on the joint stiffness is also simulated by using the model, which shows reasonable results.