基于SPH的类矩形盾构同步注浆扩散机制及参数获取

发布时间：2018-04-26 18:58

  本文选题：类矩形盾构 + 光滑粒子流体动力学(SPH)方法　； 参考：《同济大学学报(自然科学版)》2017年11期

【摘要】：异型盾构由于自身断面几何形状的特殊性,需要对其同步注浆的扩散效果及参数控制进行深入研究.利用光滑粒子流体动力学(SPH)方法对国内第1条类矩形盾构法隧道工程中同步注浆扩散机制和参数获取进行研究.分析结果表明,浆液扩散模式具有纵环向相互关联的挤压填充性流动特征,其在盾构顶/底部填充效率较差;高流动度和早强高抗剪性浆液的扩散面弧度与压力损失率效果以及整环流动封闭效率和填充均匀度都优于液态浆和抗剪浆;注入率150%对周边环境的扰动程度最小,上下孔位浆液注入比为4∶3∶2∶1的注浆效果最好,体现为浆液压力分布更均匀;而考虑较快的闭合/充盈时间可以认为对称孔位布置更适合类矩形盾构同步注浆施工.
[Abstract]:Due to the particularity of its section geometry, the diffusion effect of synchronous grouting and the control of its parameters need to be deeply studied. The diffusion mechanism and parameter acquisition of synchronous grouting in the first class of rectangular shield tunneling in China are studied by using smooth particle hydrodynamics (SPH) method. The results show that the slurry diffusion model has the characteristics of compression-filled flow with longitudinal and circumferential correlation, and its filling efficiency at the top / bottom of shield is poor. The diffusion surface radians and pressure loss rates of high mobility, early strength and high shear resistance slurry, as well as the sealing efficiency and filling uniformity of annular flow are superior to those of liquid slurry and shear slurry, and the injection rate of 150% has the least disturbance to the surrounding environment. The slurry injection ratio of 4: 3: 2: 1 in the upper and lower hole position is the best, which shows that the slurry pressure distribution is more uniform, and considering the faster closing / filling time, it can be considered that the symmetrical hole position arrangement is more suitable for the synchronous grouting construction of rectangular shield machine.
【作者单位】： 同济大学土木工程学院;上海隧道工程股份有限公司;
【基金】：国家自然科学基金(51378388) 上海市科学技术委员会重点科研项目(14DZ1207900)
【分类号】：U455.43
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本文编号：1807237