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在盾构管片壁后注浆时,由于浆液渗透压的存在,浆液会向外渗透,浆体本身逐渐固结,作用在管片上的注浆压力逐渐消散。考虑到浆液往周边地层渗透过程中由于黏度的变化会引起地层渗透系数的变化,推导了基于浆液黏度时变性的浆体固结变形方程和浆液压力消散方程,分析了浆液固结、消散及浆液压力沿管片外壁分布规律,为精细化分析施工阶段管片受力提供了计算依据。计算结果表明:浆液从注浆口喷出后,浆液黏性的增大使浆液流动性减小,注浆压力消散幅度减小,浆液消散持续时间变短。浆液配比与围岩渗透系数变化对注浆压力消散幅度及消散持续时间存在一定影响。现场实测结果与理论计算结果较为一致。在进行壁后注浆时,应充分考虑时变作用下浆液消散作用的影响。
In the grouting of the shield pipe wall, the grout penetrates outward due to the osmotic pressure of the grout, and the grout itself gradually solidifies, and the grouting pressure acting on the grout gradually dissipates. Considering the change of permeability coefficient caused by the change of viscosity during the infiltration of slurry into the surrounding strata, the consolidation equation and the equation of slurry pressure dispersion based on the denaturation of slurry viscosity are deduced. The consolidation, dissipation and slurry The pressure distribution along the outer wall of the segment provides the basis for the detailed analysis of the force exerted on the segment during the construction phase. The calculation results show that after the slurry is ejected from the grouting port, the increase of the viscosity of the slurry reduces the fluidity of the slurry, reduces the dispersion of the grouting pressure and shortens the dissipation duration of the slurry. The change of grouting ratio and the permeability coefficient of surrounding rock have certain influence on the dissipation range and dissipation duration of grouting pressure. Field test results and theoretical calculations are more consistent. In the post-wall grouting, should take full account of the time-varying role of slurry dispersion.