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首页> 外文期刊>Canadian Geotechnical Journal >Depth-independent cone penetration mechanism by a discrete element method (DEM)-based stress normalization approach
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Depth-independent cone penetration mechanism by a discrete element method (DEM)-based stress normalization approach

机译：基于离散元方法（DEM）的应力归一化方法与深度无关的圆锥贯入机制

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摘要

A two-dimensional discrete element model of driven piles in crushable sand was developed and validated against laboratory data. Numerical experiments were conducted to investigate the effects on the pile penetration behavior of initial sample porosity, particle crushability, initial stress state, ratio of pile diameter to median particle diameter, and ratio of model width to pile diameter. A new stress normalization method is adopted to synthesize the data at different driven depths from the simulations. The normalized vertical and horizontal stress fields surrounding the pile show an invariable pattern of stress distribution, suggesting a unique penetration mechanism independent of the penetration depth. The validity of the discrete element method (DEM) simulation results is verified by comparing the stress distributions to those observed from calibration chamber tests on model pile installation in sands.
机译：建立了可压碎砂中打入桩的二维离散元模型，并根据实验室数据进行了验证。进行了数值实验，以研究初始样品孔隙率，颗粒可破碎性，初始应力状态，桩直径与中值粒径之比以及模型宽度与桩直径之比对桩穿透行为的影响。仿真中采用了一种新的应力归一化方法来合成不同驱动深度的数据。桩周围的归一化垂直和水平应力场显示出不变的应力分布模式，表明了一种与穿透深度无关的独特穿透机制。通过将应力分布与砂模型桩安装中的标定室测试所观察到的应力分布进行比较，从而验证了离散元方法（DEM）仿真结果的有效性。

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