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首页> 外文期刊>Soils and foundations >Effects of inter-helix spacing and short-term soil setup on the behaviour of axially loaded helical piles in cohesive soil
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Effects of inter-helix spacing and short-term soil setup on the behaviour of axially loaded helical piles in cohesive soil

机译：螺旋间距和短期土体设置对粘性土中轴向荷载螺旋桩性状的影响

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Axial compressive load tests performed on piles instrumented with strain gauges were completed in order to investigate the effects of inter-helix spacing on the behaviour of helical piles. The test piles had two helices with varied values of helix spacing. The helix-bearing soil layer consisted of a homogeneous clay with an average undrained shear strength of 65 kPa. The test pile failure mechanisms were determined by comparing the measured load distributions to the distributions predicted by the individual bearing and the cylindrical shear models. The results suggest that the individual bearing model dominates the pile behaviour for piles with an inter-helix spacing to helix diameter ratio greater than or equal to 1.5. The helix bearing capacity factor and the shaft adhesion factor were evaluated by comparing the measured pile component resistances to the theoretical estimations. The back-calculated bearing capacity and the adhesion factors were below the values traditionally used in helical pile design. The effects of the soil setup on the pile behaviour were evaluated by comparing the load-settlement response of a pile tested immediately after the pile installation to equivalent piles tested many days after the installation. A piezometer installed near the upper helix edge was used to measure the excess pore pressure generation and dissipation induced by the installation. The results suggest that the pore pressure generation induced by the pile installation was minimal and had little influence on the short-term ultimate capacity. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：为了研究螺旋间距对螺旋桩性能的影响，完成了在装有应变仪的桩上进行的轴向压缩载荷试验。测试桩有两个螺旋，螺旋长度的值各不相同。带有螺旋线的土壤层由均质粘土组成，平均不排水剪切强度为65 kPa。通过将测得的载荷分布与单个轴承和圆柱剪切模型预测的分布进行比较，确定了测试桩的破坏机理。结果表明，单独的轴承模型在螺旋间距与螺旋直径之比大于或等于1.5的桩中占主导地位。通过将测得的桩组件电阻与理论估算值进行比较，可以评估螺旋承载力因子和轴粘附因子。反向计算的承载力和附着系数低于螺旋桩设计中传统使用的值。通过将安装桩后立即测试的桩的荷载与沉降响应与安装后几天测试的等效桩进行比较，来评估土壤设置对桩性能的影响。安装在上螺旋边缘附近的压力计用于测量由安装引起的过大孔隙压力的产生和消散。结果表明，由桩安装引起的孔隙压力的产生是最小的，并且对短期极限承载力的影响很小。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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