Numerical calculations for prediction of grout spread with account for filtration and varying aperture
Numerical calculations for prediction of grout spread with account for filtration and varying aperture
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DOI：
10.1016/s0886-7798(01)00004-9
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发表时间：
2000-10-01
影响因子：
6.9
通讯作者：
Andersson, J
中科院分区：
文献类型：
--
作者：
Eriksson, M;Stille, H;Andersson, J
灌浆作为一种减少地下设施渗水的方法已经使用了数十年。随着对密封性和成本效率的需求增加，改进方法的动力也增加，并且了解控制因素的需求也得到关注。有关注浆的知识涉及多个研究领域，例如裂隙岩石中的粉末和注浆材料的性能。了解这些领域对于灌浆研究至关重要。裂缝几何形状中浆液扩展的数值模拟是实现这种理解的一种方法。本文介绍了如何使用浆液扩展和密封效果的数值计算来预测注浆结果。该计算涉及导电元件网络中的灌浆功率，代表裂缝几何形状，可了解灌浆时的控制参数。裂缝孔径的空间变化对水泥浆的扩散有显着影响。对灌浆特性的测量和实验室实验表明，灌浆具有有限的渗透能力，并且如果收缩的孔径小于临界值，即当在灌浆中的收缩之前形成滤饼并且通过的大部分被过滤时，则灌浆会发生过滤。本文提出了一种水泥浆过滤模型。当计算中考虑过滤和有限的渗透能力时，会观察到额外的强烈影响。这强调了对代表性几何形状的需要，包括裂缝变异性和灌浆特性的测量。 (C) 2001 Elsevier Science Ltd. 保留所有权利。
Grouting as a mean to reduce the ingress of water to underground facilities has been used for decades. With an increased demand for tightness and cost efficiency, the incentive to improve the method has also increased, and the need to understand the governing factors has been focused. The knowledge concerning grouting involves several fields of research, for instance pow in fractured rock and the behaviour of the grouting material. An understanding of these fields is essential in grouting research. Numerical modelling of grout propagation in fracture geometries is one means of achieving such understanding The paper presents how numerical calculations of grout spread and sealing effect can be used for predictions of the grouting result. The calculation concerns pow of grout in a network of conductive elements, representing a fracture geometry with the scope to understand the governing parameters when grouting. The spread of grout is significantly affected by the spatial variability of the fracture aperture. Measurements on grout properties and laboratory experiments show that the grout possesses a limited penetration ability and that filtration of the grout occurs if the aperture of a constriction is smaller than a critical value, i.e. when a filter cake forms in front of constrictions in the pow and the great that passes is filtered. In the paper, a model for filtration of grout is presented. When filtration and limited penetration ability are incorporated in the calculations, additional strong effects are observed. This underlines the need of both a representative geometry, including the fracture variability and measurements of grout properties. (C) 2001 Elsevier Science Ltd. All rights reserved.