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Extending chemo-thermal quality assessment for jet grouting

机译：扩展喷射浆化学热质量评估

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Today quality assessment of jet grouting focuses on the determination of the diameter of the column and the cement content of the improved soil exploiting the exothermal nature of the hydration of cement. This is accomplished by in situ temperature measurement followed by a back-calculation employing a simplified one-dimensional chemo-thermal finite-element simulation model. The underlying assumptions, such as simple geometric properties and disregarding the construction process, lead to the questions of the range of applicability of the existing quality-assessment tool and, in what cases a more refined simulation approach becomes necessary. By means of a two-dimensional simulation, the influence of the geometric properties (height/radius ratio) of jet-grouted columns and of adjacent columns on temperature development is investigated. Finally, the simulation results are compared with the measurements from a construction site, showing the benefit of the proposed model and the simulation approach in the case of complex jet-grouting applications.
机译：今天，喷射灌浆的质量评估着重于利用水泥水化的放热性质来确定立柱的直径和改良土壤的水泥含量。这是通过现场温度测量，然后使用简化的一维化学热有限元模拟模型进行反算来完成的。基本假设（例如简单的几何特性和不考虑构造过程）引发了现有质量评估工具适用范围的问题，在何种情况下，有必要采用更精细的仿真方法。通过二维模拟，研究了喷射灌浆塔和相邻塔的几何特性（高度/半径比）对温度变化的影响。最后，将模拟结果与施工现场的测量结果进行比较，显示了在复杂的喷射注浆应用中所提出的模型和模拟方法的优势。

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