Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening
Ground reaction curve for tunnels with jet grouting umbrellas considering jet grouting hardening
复制标题
DOI：
10.1016/j.ijrmms.2015.03.021
复制
发表时间：
2015-06
影响因子：
7.2
通讯作者：
M. Heidari;F. Tonon
中科院分区：
文献类型：
--
作者：
M. Heidari;F. Tonon
在计算隧道高压旋喷伞加固地基的反应曲线时，由于采用了高压旋喷特性的平均值，因此忽略了高压旋喷的渐进硬化。在本文中，我们提出了一个新的程序，计算这些理由的反应曲线，考虑喷射灌浆硬化。在地面平面应变分析中，隧道开挖通过以隧道纵向变形剖面获得的速率增加隧道收敛来表示。这种新奇使我们能够以准确的速度进行分析，这对喷射灌浆隧道至关重要。使用这种新的方法，可以估计一个下限收敛的支持隧道，因此上限的压力隧道支持。利用有限元模型，我们计算了一个案例研究隧道的地面反应曲线，并考虑和不考虑喷射注浆硬化。结果曲线表明，忽略喷射灌浆硬化可能导致这些隧道的不安全设计。我们还使用地面反应曲线来估计由于喷射灌浆和喷射灌浆在不同隧道推进速率下的效率而节省的隧道支护。
In the calculation of the reaction curve for grounds reinforced with jet grouting umbrellas in tunnels, the jet grouting progressive hardening is ignored by assuming mean values for the jet grouting properties. In this paper, we present a new procedure that calculates the reaction curve for these grounds, considering jet grouting hardening. Tunnel excavation is represented in the ground plane-strain analysis by increasing the tunnel convergence at a rate obtained from the tunnel longitudinal deformation profile. This novelty allows us to perform the analysis at an accurate rate, which is critical for jet grouted tunnels. Using this new approach, one can estimate a lower bound for convergence of supported tunnels and hence an upper bound for pressure on the tunnel supports. Using a finite element model, we calculate the ground reaction curves for a case study tunnel with and without considering jet grouting hardening. The resulting curves illustrate that ignoring the jet grouting hardening can lead to an unsafe design of these tunnels. We use the ground reaction curve to also estimate the savings in tunnel supports due to jet grouting and the efficiency of jet grouting at different tunnel advance rates.