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基于弹性地基梁沉管隧道纵向计算理论,提出了一种刚度影响线分析方法,为节段式沉管隧道接头剪力的分析计算提供了理论基础。研究了沉管隧道接头剪力与容许地基刚度变化之间的关系,在研究确定地基刚度变化的幅值、模式及与纵向差异沉降之间关系的基础上,研发了基于接头剪力键容许剪力的纵向差异沉降简化计算公式。通过两个算例对刚度影响线分析方法及纵向差异沉降容许值简化计算公式进行了验证。纵向差异沉降容许值计算公式形式简单、物理意义明确、使用方便,为沉管隧道地基处理方案的确定提供了方法。
Based on the longitudinal calculation theory of elastic foundation beam immersed tunnel, a stiffness influence line analysis method is proposed, which provides a theoretical basis for the analysis and calculation of the shear force of stepped immersed tunnel joint. Based on the study of the relationship between the amplitude and the mode of variation of foundation stiffness and the differential settlement of longitudinal foundation, the relationship between shear force and the variation of allowable foundation stiffness was studied. Simplified formula for calculating the longitudinal differential settlement of forces. Two examples are used to verify the method of calculating the influence curve of the stiffness and the simplified calculation formula of the allowable value of the longitudinal difference settlement. The calculation formula of permissible value of longitudinal differential settlement is simple, the physical meaning is clear, and it is easy to use. It provides a method for the settlement treatment of immersed tunnel foundation.