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首页> 外文期刊>Computers and Geotechnics >Modelling 3D desiccation cracking in clayey soils using a size-dependent SPH computational approach
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Modelling 3D desiccation cracking in clayey soils using a size-dependent SPH computational approach

机译：使用大小相关的SPH计算方法对黏性土壤中的3D干燥裂纹进行建模

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摘要

Modelling desiccation cracking in soils is a challenging process that requires a robust computational approach capable of describing soils undergoing thermo-hydro-mechanical coupling processes induced complex cracking patterns. To facilitate this process, this paper presents a computational approach that combines the mesh-free smoothed particle hydrodynamics (SPH) method and a size-dependent constitutive model with an embedded cohesive fracture process zone to simulate shrinkage induced soil cracking. The proposed method describes the fracture geometry through a set of SPH particles that carries their own cohesive fracture process zone and freely moves without being confined to a grid system. As it is a particle-based approach, there are no preferred orientations for cracks to develop, and hence the direction of crack propagation is controlled by local stress conditions and material properties only. This unique feature of SPH in conjunction with the size-dependent constitutive model enables the proposed method to naturally capture the crack propagation in soils while eliminating issues associated with spatial-dependent solutions. The proposed computational framework is verified against analytical solutions followed by the validation against experiment data of direct shear tests, flexural tests and shrinkage-induced soil cracking tests. Very satisfactory agreements with experimental data demonstrate that the proposed computational method is a promising approach for further incorporating multi-physical processes that can provide insights into the crack development processes in clayey soils.
机译：对土壤中的干燥开裂进行建模是一个具有挑战性的过程，需要一个强大的计算方法，该方法能够描述经历热-水-机械耦合过程引起的复杂开裂模式的土壤。为促进此过程，本文提出了一种计算方法，该方法将无网格的平滑粒子流体动力学（SPH）方法和与尺寸相关的本构模型与嵌入式内聚破裂过程区域相结合，以模拟收缩引起的土壤开裂。所提出的方法通过一组SPH粒子描述了裂缝的几何形状，这些粒子带有它们自己的内聚破裂过程区域，并且可以自由移动而不会局限于网格系统。由于它是基于粒子的方法，因此没有优选的裂纹扩展方向，因此，裂纹扩展的方向仅受局部应力条件和材料性能控制。 SPH的这一独特功能与尺寸相关的本构模型相结合，使所提出的方法能够自然捕获土壤中的裂纹扩展，同时消除与空间相关的解决方案相关的问题。所提出的计算框架通过分析解决方案进行了验证，然后通过直接剪切试验，弯曲试验和收缩引起的土壤开裂试验的实验数据进行了验证。与实验数据的非常令人满意的协议表明，所提出的计算方法是进一步纳入多物理过程的有前途的方法，可以为黏土中的裂缝发展过程提供见识。

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