考虑黏度时效性与空间效应的C-S双液浆盾构隧道管片注浆机理分析

发布时间：2018-06-13 05:45

  本文选题：盾构隧道 + C-S双液浆　； 参考：《中国公路学报》2017年08期

【摘要】：在假定C-S双液浆符合宾汉姆流体的基础上,考虑双液浆黏度时变性与空间效应,并认为盾构隧道管片注浆符合球形渗透模型,通过平衡方程与Dupuit-Forchheimer公式,对宾汉姆流体壁后注浆渗透扩散规律进行理论分析,得到C-S双液浆扩散半径计算公式以及管片受力计算公式。通过具体实例分析了注浆压力、注浆管内浆液流速以及C-S双液浆黏度参数A与参数Y对浆液扩散半径及管片受力的作用,对比了不同注浆参数对注浆效果的影响。结果表明:浆液扩散半径随注浆压力与注浆管内浆液流速的增大而增大,随黏度参数A与参数Y增大而减小,其中注浆压力与参数Y对浆液扩散影响较大,注浆管内浆液流速与参数A对浆液扩散影响较小;管片受力随注浆压力与注浆管内浆液流速增大而增大,但注浆压力的影响效果不断增大而后趋于稳定,注浆管内浆液流速的影响效果不断减弱而后趋于稳定;管片受力随参数A与参数Y增大而减小,其中参数A对管片受力的影响呈负线性关系,影响效果较弱,参数Y对管片受力的影响呈现"三段式"变化——缓慢减小阶段、加速减小阶段以及快速减小阶段,影响效果明显。
[Abstract]:On the basis of assuming that C-S two-liquid slurry conforms to Bingham fluid, considering the time-varying viscosity and spatial effect of two-liquid slurry, it is considered that the grouting of shield tunnel segments conforms to the spherical permeation model, and through the equilibrium equation and Dupuit-Forchheimer formula, Based on the theoretical analysis of the permeation and diffusion law of Bingham fluid after grouting, the formulas for calculating the diffusion radius of C-S double slurry and the force acting on the segments are obtained. The effects of grouting pressure, grouting velocity and C-S double slurry viscosity parameter A and parameter Y on the diffusion radius of grouting and the force on segments are analyzed through concrete examples, and the effects of different grouting parameters on grouting effect are compared. The results show that the slurry diffusion radius increases with the increase of grouting pressure and grouting velocity, and decreases with the increase of viscosity parameter A and parameter Y, in which the grouting pressure and parameter Y have a great effect on the slurry diffusion. The influence of grouting velocity and parameter A on grouting diffusion is small, and the stress of segment increases with the increase of grouting pressure and grouting velocity, but the effect of grouting pressure increases and then tends to be stable. The effect of grouting fluid velocity is weakening and then tends to be stable, the stress of segment decreases with the increase of parameter A and parameter Y, in which the influence of parameter A on the stress of segment is negative linear, and the effect is weak. The effect of parameter Y on the stress of the segment is "three-stage" -slowly decreasing stage, accelerating decreasing stage and fast decreasing stage, and the effect is obvious.
【作者单位】： 长安大学公路学院;山东省交通规划设计院;北京交通大学土木建筑工程学院;广东省南粤交通投资建设有限公司;
【基金】：国家自然科学基金项目(51478044,51678062)
【分类号】：U455.43
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本文编号：2012945