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Numerical verification of the continuous calculation method for tip stress during the driving process of the dynamic penetration test

机译:动态渗透试验驱动过程中尖端应力连续计算方法的数值验证

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This paper presents a calculation method for obtaining the continuous variation in stress between the tip and the soil during dynamic penetration tests, particularly in the case of using the Panda 3 (R) penetration testing device. The originality of the method is that the tip stress can be computed continuously throughout the driving process. For each impact of the hammer on the penetrometer, data are recorded by sensors located at the top of the apparatus. Then, the stress at the tip and the displacement of the apparatus are calculated with a method based on the propagation of waves in the device. A three-dimensional numerical model of the penetration test, based on the Panda 3 (R) specifications and using the discrete element method (DEM), is proposed in this paper. The purpose of the simulations is to validate the calculation method by comparing the curves of the tip stress versus the penetration distance obtained in two different ways, the first being the distance directly observed at the tip and the second being the distance calculated from the data recorded at the top of the penetrometer, as with the experimental device. The entire apparatus is represented, including the hammer, the rod, and the tip, and is driven into the model soil. The calculation method is applied, and the results are compared to the actual response of the soil to the driving of the penetrometer directly at the tip, which can be obtained with the numerical model. The responses are found to be very similar, confirming the theoretical framework and its underlying assumptions. This method is applied to dynamic penetration tests and provides the opportunity to obtain mechanical parameters other than the tip resistance from the tests. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译:本文介绍了在动态穿透试验期间获得尖端和土壤之间应力的连续变化的计算方法,特别是在使用Panda 3(R)穿透检测装置的情况下。该方法的原创性是在整个驾驶过程中可以连续计算尖端应力。对于锤子对渗透度值的每次冲击,数据通过位于设备顶部的传感器记录。然后,利用基于器件中的波传播的方法计算尖端处的应力和装置的位移。本文提出了一种基于熊猫3(R)规范和使用离散元素法(DEM)的渗透试验的三维数值模型。模拟的目的是通过比较尖端应力的曲线与以两种不同方式获得的穿透距离进行验证来验证计算方法,首先是在尖端直接观察到的距离,第二是从记录的数据计算的距离在透光仪的顶部,与实验装置一样。将整个装置表示,包括锤子,杆和尖端,并且被驱动到模型土壤中。应用计算方法,并将结果与​​土壤的实际响应进行比较,直接在尖端处直接在尖端上驱动,这可以通过数值模型获得。发现响应非常相似,确认理论框架及其潜在的假设。该方法应用于动态穿透测试,并提供了从测试中获得除尖端电阻之外的机械参数的机会。 (c)2019年Elsevier B.V的生产和托管代表日本岩土工会。

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