考虑泥浆触变性和管土接触特性的顶管摩阻力公式

发布时间：2018-07-18 08:20

【摘要】：顶进力是顶管工程设计和施工的重要参数,而顶管侧摩阻力对顶进力起控制作用,其大小主要受管土接触和管浆接触特性影响。为了更加准确地计算顶管摩阻力,假设隧洞孔壁在泥浆压力作用下保持稳定,管道周围同时存在管土接触和管浆接触,采用协调表面Persson接触模型分析管土接触特性,得出考虑接触压力分布影响的管土摩阻力;然后利用半无限弹性体中柱形圆孔扩张理论分析注浆压力对泥浆套厚度的影响,并结合泥浆触变性和流体力学平行平板模型计算管浆摩阻力。在此基础上考虑管道与隧洞的相对位置,同时将管道顶进时的滑动摩擦阻力作为下限值,顶管重启动时的静摩擦阻力作为上限值,总结出直线和曲线顶管摩阻力公式。通过与工程实例数据对比,结果表明该计算公式下限值与实测值最接近,证明其适用性。
[Abstract]:The jacking force is an important parameter for the design and construction of pipe jacking, and the lateral friction resistance of the pipe jacking is controlled by the force of the jacking force, and its size is mainly influenced by the contact characteristics of the pipe soil and the pipe pulp. The contact characteristic of pipe soil is analyzed by a coordinated surface Persson contact model, and the frictional resistance of pipe earth is obtained by considering the contact pressure distribution, and then the influence of the grouting pressure on the thickness of the mud sleeve is analyzed by the cylindrical hole expansion theory in the semi infinite elastic body, and the parallel plate model of the slurry's thixotropy and fluid mechanics is used to calculate the tube. On this basis, the relative position of the pipe and tunnel is considered. At the same time, the sliding friction resistance of the pipe jacking is taken as the lower limit value, and the static friction resistance of the pipe jacking is taken as the upper limit value. The friction resistance formula of the straight line and the curve pipe jacking is summed up. The results show that the lower limit value of the formula is compared with the engineering example. The result shows that the limit value of the formula is shown. The measured value is the closest, proving its applicability.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：交通运输部项目(201331J11300)
【分类号】：TU990.3;U175

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