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A review of the Namntall Tunnel project with regard to grouting performance

机译：关于灌浆性能的Namntall隧道项目回顾

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摘要

The 6 km tunnel under the Namntall hill is a part of the Botniabanan railway project in northern Sweden. The tunnels were excavated by means of drilling and blasting and with, for Scandinavian conditions, a normal grouting routine. The grouting is performed to reduce water ingress into the tunnel to the level defined in the contract. When the water ingress requirements proved difficult to meet, it was obvious that the geological and the hydrogeological conditions in the tunnel would dictate the work processes. A distinctive change in rock conditions influenced both grouting performance and seepage into the tunnel. The rock conditions and the grouting were quantified throughout the project and these are summarized in this paper. It can be concluded that the strongest correlation is between the water ingress, the hydrogeological conditions and the density of the zones and the conditions in and around these zones. The paper suggests a different approach to hydrogeological prognosis and the grouting process, such as distribution of grouting classes, increased mixer capacities and regular use of two grouting rounds.
机译：Namntall山下的6公里隧道是瑞典北部Botniabanan铁路项目的一部分。隧道是通过钻孔和爆破开挖的，并且在斯堪的纳维亚条件下采用常规的注浆程序进行开挖。进行注浆是为了将进入隧道的水减少到合同规定的水平。当事实证明进水要求难以满足时，很明显，隧道中的地质和水文地质条件将决定工作过程。岩石条件的显着变化影响了注浆性能和隧道渗漏。在整个项目中对岩石条件和灌浆进行了量化，并在本文中进行了总结。可以得出结论，最强的相关性是在进水量，水文地质条件和区域密度以及这些区域内和周围的条件之间。本文提出了一种不同的水文地质预测和灌浆方法，例如灌浆等级的分配，搅拌机容量的增加以及两轮灌浆的定期使用。

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