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Three‑dimensional numerical analysis of under‑reamed pile in clay under lateral loading

机译：横向载荷下粘土中膨胀桩下桩三维数值分析

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摘要

Unlike the bearing and uplift capacities of under-reamed pile, the lateral resistance of under-reamed pile is studied by a very few researchers. Therefore, in the present study, a three-dimensional numerical analysis is carried out to study the response of under-reamed pile in clay under lateral loading. In the numerical analysis, various parameters such as embedment length to shaft diameter ratio (L-u/D), top bulb distance from the base to bulb diameter ratio (h(b)/D-u), undrained cohesion (c(u)), rate of increase of undrained cohesion (m), number of bulbs, and bulb spacing to bulb diameter ratio (s/D-u) are considered as variables. From the present study, load-deflection curve, variations of deflection, shear force, and bending moment, displacement contour, and soil stress in front of the pile are obtained. The lateral load-carrying capacity of under-reamed pile is estimated based on displacement-based criteria. The lateral load-carrying capacity of under-reamed pile (Q(hur)) is found to increase with increase in L-u/D, h(b)/D-u, number of bulbs, c(u), m, and decrease in s/D-u. The deflection at the pile head is found to decrease significantly with increase in h(b)/D-u and number of bulbs, and decrease in s/D-u. It is expected that the present results will be useful from serviceability point of view.
机译：与膨胀桩下桩的轴承和提升能力不同，通过少数研究人员研究了膨胀桩的横向电阻。因此，在本研究中，进行了三维数值分析，以研究横向载荷下粘土中的膨胀桩响应。在数值分析中，诸如轴径比（LU / D）的各种参数，例如轴直径比（Lu / d），距底部距灯泡直径比（H（b）/ du），不介绍的内聚力（c（u）），速率不加息的内聚力增加（m），灯泡数量和灯泡间距与灯泡直径比（s / du）的鳞片间隔被认为是变量。从本研究中，获得了卷的载荷偏转曲线，偏转，剪切力和弯曲力矩，位移轮廓和桩前的土壤应力。基于基于位移的标准估计欠铰孔桩的横向承载能力。侧向束桩的横向承载能力（q（q（q（q（hur））随着Lu / d，h（b）/ du，灯泡数，c（u），m的数量增加而增加/ du。发现桩头的挠度随着H（b）/ d-U和灯的数量增加而显着降低，并且S / D-U的减少。预计目前的结果将是可用的可维护性的观点。

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