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EXPERIMENTAL INVESTIGATION INTO PILE DIAMETER EFFECTS OF LATERALLY LOADED MONO-PILES

机译:横向加载单桩桩直径效应的实验研究

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This paper presents the results of model tests on laterally loaded mono-pile foundations in sand. The tests have been performed in a geotechnical centrifuge. The objective of the research is to quantify large diameter effects of these mono-piles on the lateral capacity and the stiffness response for cyclic lateral loading. These large diameters are out of the validity range of the commonly used design methods. For this reason prototype pile diameters up to 4.4 m with a length over diameter ratio of 5 have been investigated. The results show an increase in pile diameter from D_s = 2.2 m to D_l = 4.4 m leads to a significant increase in static lateral capacity and stiffness from cyclic load tests. All tests have been performed with constant LID = 5, I_d = 60% and a load eccentricity up to e = 4.8 m. However, the current test series needs to be extended to higher initial densities and the load control should be more strictly regulated before a clear diameter dependence, for pile diameters > 2.2 m, is proven.
机译:本文介绍了在砂土中横向加载的单桩基础模型测试的结果。测试是在岩土离心机中进行的。研究的目的是量化这些单桩的大直径效应对侧向荷载和周期性侧向荷载的刚度响应。这些大直径超出了常用设计方法的有效范围。因此,已经研究了原型桩直径最大为4.4 m,长径比为5的情况。结果表明,桩直径从D_s = 2.2 m增大到D_1 = 4.4 m,导致循环荷载测试的静态侧向承载能力和刚度显着增加。所有测试均在恒定LID = 5,I_d = 60%和最大e = 4.8 m的负载偏心率下进行。但是,当前的测试系列需要扩展到更高的初始密度,并且在证明直径大于2.2 m的明显直径相关性之前,应对载荷控制进行更严格的调节。

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