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Numerical Study of the Effect of Pile Driving on the Position of a Neutral Plane

机译:打桩对中性面位置影​​响的数值研究

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The position of the neutral plane is required to be implicitly known for the accurate determination of the magnitude and profile of negative skin friction. In contrary to the conventional analysis of bored piles, this study reports the effect of pile installation procedure on the final position of the neutral plane. Two types of initial conditions are considered, one where the pile driving is simulated (actual) and the other where the pile is considered in place (in situ). Finite element analysis exhibited that the neutral plane is at a greater depth in the 'actual' case relative to the 'in situ' case. Contours of effective stress near the pile tip implied higher soil stiffness near the pile base in the driven pile (actual) simulation, resulting in a lesser settlement and is postulated as the reason for the lowering of the neutral plane in the latter (in situ) case.
机译:为了准确确定负向皮肤摩擦的大小和轮廓,需要隐式知道中性平面的位置。与钻孔桩的常规分析相反,本研究报告了桩安装过程对中性面最终位置的影响。考虑两种类型的初始条件,一种是模拟打桩(实际),另一种是考虑到位(就地)。有限元分析表明,相对于“原位”情况,中性面在“实际”情况下的深度更大。桩尖附近的有效应力轮廓表明,在驱动桩(实际)模拟中,桩基附近的土壤刚度较高,从而导致沉降减少,并被认为是在后者中(原位)降低中性面的原因案子。

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