Study on Microscopic Roadbed Grouting Mechanism Based on CFD-DEM Coupling Algorithm

Yang Changwei; Guo Jinhao; Lian JingWang Zhimeng

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Study on Microscopic Roadbed Grouting Mechanism Based on CFD-DEM Coupling Algorithm

机译：Study on Microscopic Roadbed Grouting Mechanism Based on CFD-DEM Coupling Algorithm

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Grouting reinforcement technology gradually has been widely used to repair the subgrade settlement diseases, but the current single application of discrete element software or finite element software cannot effectively simulate the grouting process. Therefore, one new method is put forward in the research of grouting based on the CFD-DEM coupling principle. And then, one typical subgrade section in the Shanghai-Nanjing intercity railway is used to simulate the grouting process and diffusion mechanism of slurry from microlevel. Based on the results of site survey, some findings are shown as follows: First, the new method is feasible which integrates the favorable aspects of discrete elements, finite elements, and boundary elements. Second, the greater the grouting pressure, the greater the influence range of grouting, and it shows six petals shape. When the grouting pressure is small, the grouting generally shows penetration or extrusion grouting, and its influence range is small. When the grouting pressure is large enough, it is characterized by splitting grouting, and the influence range of grouting is getting larger and larger. Third, the growth rates of influence range gradually increase with the increasement of grouting pressures, and the reasonable selection of grouting pressures is very important.

机译：注浆加固技术已逐渐被广泛用于修复路基沉降病害，但目前单纯应用离散元软件或有限元软件无法有效模拟注浆过程。因此，在基于CFD-DEM耦合原理的注浆研究中提出了一种新的方法。然后，利用沪宁城际铁路1个典型路基断面，从微观层面模拟了泥浆的注浆过程和扩散机理。根据现场勘察结果，发现新方法综合了离散元、有限元和边界元的优点，是可行的。其次，灌浆压力越大，灌浆影响范围越大，呈六瓣状。当注浆压力较小时，注浆一般呈渗透或挤出灌浆，其影响范围较小。当注浆压力足够大时，其特点是劈裂灌浆，灌浆的影响范围越来越大。第三，影响范围的增长速度随着注浆压力的增加而逐渐增大，合理选择注浆压力非常重要。

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来源
《Mathematical Problems in Engineering: Theory, Methods and Applications》 |2020年第8期|4948738.1-4948738.9|共9页
作者
Yang Changwei; Guo Jinhao; Lian JingWang Zhimeng;
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作者单位

China Railway Eryuan Engn Grp Co Ltd, Inst Sci & Technol, Chengdu 610031, Peoples R China|Southwest Jiaotong Univ, Dept Civil Engn, Chengdu 610031, Peoples R China;

Southwest Jiaotong Univ, Dept Civil Engn, Chengdu 610031, Peoples R China;

Design Inst China Railway Acad Co Ltd, Dept Engn Econ, Chengdu 610031, Peoples R ChinaChina Railway Eryuan Engn Grp Co Ltd, Dept Engn, Chengdu 610031, Peoples R China;

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Study on Microscopic Roadbed Grouting Mechanism Based on CFD-DEM Coupling Algorithm

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