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Tail void grouting material: A parametric study on the role of hydro-mechanical characteristics in mechanized tunneling
Tunnelling and Underground Space Technology ( IF 6.9 ) Pub Date : 2023-02-22 , DOI: 10.1016/j.tust.2023.105053
Danial Mohammadzamani, Arash Alimardani Lavasan, Torsten Wichtmann

This paper investigates the influence of the hydro-mechanical properties of the tail void grouting material on short and long-term behavior of the tunnel. These characteristics are of high importance affecting the deformations and pore pressure regime around the tunnel as well as forces and deformations in the linings. Various properties of the tail void grouting material including thickness of grouting layer, permeability, stiffness, hardening ratio, shrinkage, and creep behavior are investigated using 3D Finite Element Method. The effect of each parameter variation on the representative surface settlements as well as deformations and excess pore pressures around the tunnel along with the axial forces and radial displacement of the linings has been thoroughly investigated. According to the results, a high hardening ratio corresponding to a fast-hardening grout could lead to 75% lower surface settlement. Utilization of a low permeable grout results in excess pore pressure remaining in the system which is 4.5 times higher than using a high permeable grout. The magnitude axial forces of the lining will depend on the direction of dissipation, when the permeability of the grout is concerned.



中文翻译:

尾孔灌浆材料:机械化隧道掘进中流体力学特性作用的参数研究

本文研究了尾孔灌浆材料的流体力学特性对隧道短期和长期行为的影响。这些特征对于影响隧道周围的变形和孔隙压力状态以及衬砌中的力和变形非常重要。使用三维有限元方法研究了尾部空隙灌浆材料的各种特性,包括灌浆层厚度、渗透性、刚度、硬化率、收缩和蠕变行为。已经深入研究了每个参数变化对隧道周围典型地表沉降、变形和超孔隙水压力以及衬砌的轴向力和径向位移的影响。根据结果​​,对应于快速硬化灌浆的高硬化率可导致表面沉降降低 75%。使用低渗透性灌浆会导致系统中剩余的超孔隙压力比使用高渗透性灌浆高 4.5 倍。当考虑灌浆的渗透性时,衬砌轴向力的大小将取决于耗散方向。

更新日期:2023-02-22
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