软土地区盾构隧道弯曲刚度有效率取值研究

修正惯用法以其概念明确、理论成熟和计算便捷的特点在盾构隧道设计中被广泛应用。弯曲刚度有效率η是修正惯用法中的重要参数,其取值对于隧道结构的计算结果具有至关重要的影响。研究基于荷载结构法,利用有限元计算软件ABAQUS建立了匀质圆环模型和梁-弹簧模型,研究了盾构隧道在软土地区通错缝拼装、基床系数和接头相对刚度对弯曲刚度有效率η的影响。通过对数值模拟计算结果进行整理,得到了弯曲刚度有效率η的拟合公式和通错缝拼装弯曲刚度有效率η的转化公式,为确定修正惯用法中的弯曲刚度有效率η提供了计算方法和参考依据。

Study on the Value of Effective Bending Rigidity Ratio of Subway Shield Tunnel in Soft Soil Area

The modified routine method is widely used in shield tunnel design because of its clear concept, mature theory and convenient calculation. The effective ratio of bending rigidity η is an important parameter in the modified routine method. Its value has a crucial influence on the calculation result of the tunnel structure. Based on the load structure method, the study uses finite element calculation software to establish a homogeneous ring model and a beam-spring model. The method are applied to the calculation of the effective ratio of bending rigidity η. The effect of the coefficient of subgrade reaction, joint relative stiffness and erection method on the effective ratio of bending rigidity η is studied. By arranging the numerical simulation results, the fitting formula of the effective ratio of bending rigidity η and the conversion formula of the bending stiffness effective efficiency η of the fault-stitching assembly are obtained. The formula provides a calculation method for determining the effective stiffness η of the modified idiom and reference basis.