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。
Supposing that cement and sodium silicate（C-S）mixed grout was in accordance with Bingham fluid pattern,time variation and space effect of viscosity of C-S mixed grout were taken into consideration and grouting through shield tunnel segment conforms to spherical penetration model.The theoretical derivation was carried out for grouting penetration and diffusion pattern of Bingham fluid by dint of equilibrium equation and Dupuit-Forchheimer formula to obtain calculation formula for diffusion radius of C-S mixed grout and calculation formula for pressure onsegment.With concrete examples,the influence of grouting pressure,the flow rate of grout in grouting pipe,viscosity parameter A and parameter Y of C-S mixed grout on grout diffusion radius and pressure of segment was analyzed and the influence of different grouting parameters on grouting effect was compared.The results show that grout diffusion radius increases with the increase of grouting pressure and flow rate of grout in grouting pipe and decreases with the increase of parameters Aand Y.Grout diffusion was considerably influenced by grouting pressure and parameter Yand slightly influenced by the flow rate of grout in grouting pipe and parameter A.Besides,the pressure on segment increases with the increase of grouting pressure and the flow rate of grout in grouting pipe.The influence effect of grouting pressure constantly increases and tends to be stable.Whilst the influence effect of the flow rate of grout in grouting pipe constantly decreases and tends to be stable.The pressure on segment decreases with the increase of parameters Aand Y,with negative linear relationship shown in the influence of parameter Aon the pressure,ending up with minor influence.The ＂three-stage＂changes are shown in the influence of parameter Yon the pressure,that is,slow decrease stage,accelerating decrease stage and rapid decrease stage,ending up with an obvious effect.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2017年第8期49-56,共8页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51478044
51678062)
关键词
盾构隧道
C-S双液浆
理论分析
浆液扩散
管片注浆
shield tunnel
cement and sodium silicate mixed grout
theoretical analysis
grout diffusion
segment grouting
