滨海城区船闸下覆管涵纵向力学模型研究

Study on longitudinal mechanical model of lower overlying pipe gallery of ship lock in coastal urban

滨海城区船闸建设往往会出现船闸、引航道等水运设施横跨城市综合管涵的情况,影响市政管涵的稳定性,因此需要分析船闸荷载作用下下覆管涵结构的受力变形规律。目前基于连续长管涵结构的纵向变形的力学模型无法考虑变形缝的影响,因此借鉴多跨连续梁的解析解法,在Winker弹性地基假设与管涵刚性体假设的基础上,建立了基于初参数法的管涵纵向力学模型,此模型的计算结果与数值结果拟合程度良好。地基刚度、管节长度与最大沉降差值之间呈指数型变化;增加地基刚度系数、管节长度,管涵抵抗不均匀变形的能力增加;管道刚度、船闸荷载与最大沉降差值之间呈线性相关,但管道刚度对管涵抵抗不均匀沉降效果不明显。

The construction of coastal urban lock often appears the situation that the lock,approach channel and other water transport facilities cross the urban comprehensive pipe corridor,which affects the stability of municipal pipe corridor.Therefore,it is necessary to analyze the stress and deformation law of overlying pipe gallery structure under ship lock load.At present,the mechanical model based on the longitudinal deformation of continuous long pipe gallery structure cannot consider the influence of deformation joint.Therefore,based on the Winker elastic foundation hypothesis and the pipe gallery rigid body hypothesis,a pipe gallery longitudinal mechanical model based on the initial parameter method was established by using the analytical solution of multi span continuous beam for reference.The calculation results of this model fit well with the numerical results.There is an exponential change between the foundation stiffness,pipe joint length and the maximum settlement difference;With the increase of foundation stiffness coefficient and pipe joint length,the ability of pipe gallery to resist uneven deformation increases;There is a linear correlation between pipeline stiffness,lock load and the maximum settlement difference,but the effect of pipeline stiffness on the resistance of pipe gallery to uneven settlement is not obvious.