考虑浆液自重的盾构隧道管片注浆浆液渗透扩散模型

发布时间：2018-05-31 04:56

本文选题：盾构隧道 + 管片注浆　；参考：《岩土工程学报》2016年12期

【摘要】：为研究盾构隧道管片注浆的渗透扩散模型,以宾汉姆浆液流体为研究对象,基于广义达西定律(毛管组理论),并运用相关流体力学理论,推导了考虑浆液自重的盾构隧道管片注浆渗透扩散模型的计算公式,并分析了其适用范围及各参数的确定方法。结合具体计算案例,讨论了注浆参数(注浆压力、注浆时间)、地层特性(地层渗透系数)等主要因素对浆液扩散半径的影响及浆液对管片总压力的影响。结果表明:考虑浆液自重后,浆液的扩散范围呈椭球形;相同的注浆压力下,顶部注浆孔的浆液扩散范围小于底部注浆孔浆液扩散范围(顶部注浆孔出现最小扩散半径,底部注浆孔出现最大扩散半径);注浆压力、注浆时间及地层渗透系数增大,浆液扩散半径也增大,但其增长速率均减小;注浆压力增大,管片所受的注浆压力增大,单位管片所受的浆液压力呈线性增长,考虑浆液自重后,上部单位管片所受的浆液压力大于下部单位管片所受的浆液压力;注浆压力越大,注浆时间越长,地层渗透系数越大,最大扩散半径与最小扩散半径的差值越大,即浆液自重对浆液扩散半径的影响越大。
[Abstract]:In order to study the permeation diffusion model of shield tunnel segment grouting, the Bingham slurry fluid is taken as the research object, based on the generalized Darcy's law (capillary group theory) and the relevant fluid mechanics theory. The formula of seepage diffusion model of shield tunnel segment grouting considering the weight of slurry is derived, and the applicable range and the determination method of each parameter are analyzed. The influence of grouting parameters (grouting pressure, grouting time), formation characteristics (formation permeability coefficient) on the slurry diffusion radius and the influence of slurry on the total pressure of the pipe are discussed. The results show that the diffusion range of the grouting is ellipsoid when considering the gravity of the grouting, and the range of the top grouting hole is smaller than that of the bottom grouting hole under the same grouting pressure, and the minimum diffusion radius of the top grouting hole is smaller than that of the bottom grouting hole. The maximum diffusion radius appears in the bottom grouting hole, the grouting pressure, grouting time and formation permeability coefficient increase, the slurry diffusion radius also increases, but its growth rate decreases, the grouting pressure increases, and the grouting pressure increases. The slurry pressure per unit segment increases linearly. Considering the weight of the slurry, the upper unit segment is subjected to more slurry pressure than the lower unit segment, and the greater the grouting pressure, the longer the grouting time and the greater the formation permeability coefficient. The larger the difference between the maximum diffusion radius and the minimum diffusion radius, the greater the influence of the slurry weight on the slurry diffusion radius.
【作者单位】：长安大学公路学院;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(51478044,51178052,51678062)
【分类号】：U455.43

【相似文献】