The assumption of cement grouts as ‘Bingham fluids’ has thus far facilitated the development of simplified analytical tools for rock grouting design. However, from a practical standpoint the use of the Bingham constitutive law throughout the design phase has several shortcomings that merit being more systematically addressed. For instance, the known key attributes of cementitious suspensions, e.g. wall-slip, thixotropy, shear rate and time dependency that influence the grout propagation especially at low shear rates are not considered when the Bingham model is used. As such, the consequences of overlooking such crucial phenomena whilst aiming for simplicity in design remain relatively unknown. In this work, we show how considering the shear rate aspects and stop criteria with the Bingham model can be better used for grouting design. Our design suggestions are based on fundamental analysis and theory of Bingham fluid radial flow and current knowledge on cement grout rheological behaviour, as reported from rheological experiments. Moreover, we contribute to the existing design procedure by presenting a nomogram that can readily be used for practical rock grouting design. The nomogram approach allows rapid computation of all key parameters, which in essence shows that unless wall slip is taken into account up to ~50% overestimation of grout travel results.

迄今为止，将水泥浆假设为“宾汉流体”已经促进了用于岩石灌浆设计的简化分析工具的开发。然而，从实际的角度来看，在整个设计阶段使用宾汉本构定律有几个缺点，值得更系统地解决。例如，当使用 Bingham 模型时，不考虑水泥悬浮液的已知关键属性，例如壁滑移、触变性、剪切速率和影响灌浆传播的时间依赖性，尤其是在低剪切速率下。因此，在旨在简化设计的同时忽视这些关键现象的后果仍然相对未知。在这项工作中，我们展示了如何将 Bingham 模型中的剪切速率方面和停止标准更好地用于灌浆设计。我们的设计建议基于宾汉流体径向流动的基本分析和理论以及当前关于水泥浆流变行为的知识，如流变实验报告的那样。此外，我们通过提供一个可以很容易地用于实际岩石灌浆设计的列线图来为现有的设计程序做出贡献。列线图方法允许快速计算所有关键参数，这实质上表明，除非考虑墙体滑移，否则对灌浆行程结果的高估高达约 50%。