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(M)icromechanical investigation of grouting in soils

机译：（m）土壤灌浆的ICOROMECHICE调查

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摘要

Grouting and jet grouting are geotechnical consolidation techniques commonly employed to improve the mechanical behaviour of soils. Although these techniques are common, the micromechanical processes taking place at the local level are not yet totally understood and modelled. In this work, such a problem has been approached from a micromechanical perspective via the discrete element method by considering the local interaction among soil grains and pseudo-fluid particles. Homogeneous representative elementary volumes of a virtual analogue of silica sand have been first generated and tiny rigid frictionless particles have been subsequently injected through them, to simulate the grouting in granular materials. Various injection pressures, initial soil pressures and initial soil densities have been considered. The different diffusion patterns, the flow rate, the consequent increase in local stresses and the consequent reduction in local porosity have been discussed. To overcome the DEM computational restrictions and to speed up the injection simulations, a novel procedure based on the replication of pre-equilibrated cells has been adapted for both the initialization and injection phase. Finally, a qualitative laboratory-scale pressure grouting test has been reproduced to validate the results. (C) 2019 Elsevier Ltd. All rights reserved.
机译：灌浆和喷射灌浆是岩土合并技术，通常用于提高土壤的力学行为。尽管这些技术很常见，但是在局部层次进行的微机械过程尚未完全理解和建模。在这项工作中，通过考虑土壤和伪流体颗粒之间的局部相互作用，通过离散元件方法从微机械的角度来看这种问题。已经首先生成了二氧化硅砂的虚拟模拟的均匀代表性基本体积，并随后通过它们喷射了微小的刚性无摩擦颗粒，以模拟颗粒材料的灌浆。已经考虑了各种注射压力，初始土壤压力和初始土壤密度。已经讨论了不同的扩散模式，流速，随之而来的局部应力和随后的局部孔隙率的降低。为了克服DEM计算限制并加速注射模拟，基于预平衡细胞复制的新方法已经适用于初始化和注入阶段。最后，已复制了定性实验室压力灌浆试验以验证结果。 （c）2019年elestvier有限公司保留所有权利。

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