Grout injection of masonry, scientific approach and modeling
Grout injection of masonry, scientific approach and modeling
复制标题
DOI：
10.1515/rbm-2001-5580
复制
发表时间：
2000-05
期刊：
影响因子：
--
通讯作者：
F. V. Rickstal
中科院分区：
文献类型：
--
作者：
F. V. Rickstal
实验方案的结果提供了对注射过程的增强的物理理解。最重要的成就是关于砌体的可注射性和灌浆的流变特性：稳定性，粘度和剪切强度的调查结果。已经开发了新的测试或现有的测试已经适应的特点，重新启动。这项工作的独创性和要点在于模拟浆液通过砌体流动的有限元模型。砌体是模拟的节点模式。离散流动通道的网络连接这些节点，这些节点代表从注入孔开始的大通道，通过这些大通道，灌浆渗透到砌体中。通过连接到节点的电容元件，灌浆渗透到具有较细空隙的区域中。模型中考虑了水泥浆的吸水性，但不是通过改变水泥浆的流变特性，而是通过逐渐缩小流动通道来实现的。该模型能够研究灌浆渗透的时间函数。实例表明，该模型可用于分析浆体的粘度或其他流变特性对浆体在砌体中的进展的影响。同样，工艺参数的影响，即注射压力，进行了分析。甚至通过使用该模型来展示泄漏的密封效果。结果表明，该模型是一个有用的设计工具，以确定注入参数：浆液组成，粘度，剪切应力和硬化演变注入孔模式和注入压力。
The results of the experiments programme provided an enhanced physical understanding of the injection process. Most important achievements are the findings with regard to the injectability of the masonry and the rheological properties of the grouts: stability, viscosity and shear strength. New tests have been developed or existing tests have been adapted to the peculiarities of grounting. The originality and the main point of this work lie in the finite element model that simulates the flow of the grout through the masonry. The masonry is simulated by a pattern of nodes. A network of discrete flow channels connects these nodes representing the big channels through which starting from the injection hole, the grout penetrates the masonry. The penetration of the grout into the areas with finer voids is built in by means of capacitive elements that are connected to the nodes. The water absorption is incorporated in the model, not by altering the rheological properties of the grout, but by narrowing the flow channelgradually. The model enables to study the penetration of the grout in function of the time. Examples demonstrate how the model can be used for analyzing the effect of the viscosity or the other rheological properties of the grout on the progress of the grout in the masonry. Similarly, the influence of process parameters, i.e. the injection pressure, is analyzed. Even the effect of the sealing of a leakage is demonstrated by using the model. It is shown that the model is a useful design tool to determine the injection parameters: grout composition; viscosity, shear stress and hardening evolution injection holes pattern and the injection pressure.