MODELLING OF SEQUENTIAL INJECTIONS NEAR TUNNEL LININGS
MODELLING OF SEQUENTIAL INJECTIONS NEAR TUNNEL LININGS
复制标题
隧道衬砌附近顺序注入的建模
DOI：
10.3208/sandf.42.6_9
复制
发表时间：
2002
影响因子：
3.7
通讯作者：
T. Hagiwara
中科院分区：
文献类型：
--
作者：
Sw Lee;M. Bolton;R. Mair;K. Soga;T. Hagiwara
补偿灌浆包括在邻近位置进行灌浆注入，以补偿例如隧道开挖造成的地面损失。由于该技术的目标是匹配体积变化以消除沉降，因此注入周围地面扩张或压缩的趋势成为非常重要的考虑因素。此外，在设计灌浆方案时，灌浆注入的不同顺序的影响以及相对于隧道中心线的注入分区也很重要。本文研究了这些问题，使用离心机和数值模拟在致密和松散的干砂。结果表明，地表隆起和隧道衬砌变形的分布与注浆相对位置和注浆历史有关。由于先前注入产生的压实而导致的地面硬化允许从给定的注入体积产生更大的压力。这些较大的压力最终导致向上隆起和衬砌变形。最后，确定了最有利和最不利的喷射顺序与诱发的中心表面隆起和隧道衬砌变形的关系。
Compensation grouting involves making grout injections at close neighboring locations so as to replace ground loss, due to tunnelling for example. Since the objective of the technology is to match volume changes so as to eliminate subsidence, the tendency of ground to dilate or compress around the injection becomes a very significant consideration. Furthermore, the effects of different sequences of grout injection, and the zoning of injection relative to the tunnel centreline, are of interest when devising grouting schemes. This paper investigates these issues using centrifuge and numerical modelling in dense and loose dry sand. It is found that the profile of surface heave and the tunnel lining deformation is dependent on the relative injection position, as well as injection history. Ground stiffening due to the compaction arising from previous injection permits larger pressures to be developed from a given injection volume. These larger pressures eventually cause upward heaving and lining deformation. In conclusion, the most favourable and unfavourable injection sequence are identified in relationship to the induced centre surface heave and tunnel lining deformation.