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首页> 外文期刊>Journal of forest research >Shear behaviour in numerical triaxial compression tests by 3D fluid-coupled DEM: a fundamental study on mechanisms of landslide initiation.
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Shear behaviour in numerical triaxial compression tests by 3D fluid-coupled DEM: a fundamental study on mechanisms of landslide initiation.

机译：3D流体耦合DEM在三轴数值试验中的剪切行为：滑坡引发机理的基础研究。

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Shear behaviour in triaxial compression tests was numerically examined by 3D fluid-coupled DEM in a fundamental study on the mechanisms of landslide initiation. Changes in pore-water pressure because of undrained compression were calculated by introducing a measurement sphere surrounding a ball which represented the soil particles. The pore-water pressure was assigned to the measurement sphere as the product of the changes in volumetric strain and modulus of compressibility of water, and resulting flow due to the pressure differences among neighbouring measurement spheres was given on the basis of Darcy's law. Specimens for the numerical triaxial compression tests were prepared with wide ranges of initial void ratio by use of samples with three different grain-size distributions. In the loose specimens, positive pore-water pressure build-up and subsequent liquefaction were numerically reproduced. In contrast, in the dense specimens, negative pore-water pressure was observed, showing upgrade of soil structure. For the medium specimens, phase transformation, which is a typical characteristic of granular soils, was successfully reproduced. Although steady-state lines were found for each sample on a pSS-e0diagram, there was a gap at a specific initial void ratio. Although the angles of internal friction were inversely proportional to the initial void ratio in both the undrained and drained tests in the medium to dense specimens, the observed angles of internal friction were smaller than the particle-to-particle friction angle. This result may be attributable to the fact that the balls could not form the complicated soil structures created in reality by particles with complex shapes.Digital Object Identifier http://dx.doi.org/10.1007/s10310-010-0214-9
机译：在3D流体耦合DEM的基础上，通过滑坡引发机理的基础研究，对三轴压缩试验中的剪切行为进行了数值检查。通过引入围绕代表土壤颗粒的球的测量球来计算由于不排水压缩引起的孔隙水压力变化。将孔隙水压力作为体积应变和水的压缩模量变化的乘积分配给测量球，并根据达西定律给出由于相邻测量球之间的压力差而导致的流量。通过使用具有三种不同晶粒尺寸分布的样品，制备了具有宽范围的初始空隙率的数字三轴压缩试验样品。在松散的样品中，数值模拟了正孔隙水压力的累积和随后的液化。相反，在致密样品中，观察到负孔隙水压力，表明土壤结构升级。对于中等样本，成功地再现了粒状土壤的典型特征-相变。尽管在p SS -e 0 图上找到了每个样品的稳态线，但在特定的初始空隙比处存在间隙。尽管在中密度样品的不排水和排水试验中，内摩擦角均与初始空隙率成反比，但观察到的内摩擦角小于颗粒间摩擦角。该结果可能归因于以下事实：这些球无法形成由形状复杂的粒子实际创建的复杂土壤结构。数字对象标识符http://dx.doi.org/10.1007/s10310-010-0214-9

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