| P-Y曲线对成层土体中大直径单桩的适用性研究 |
| Research on the applicability of p-y curve to large diameter monopile under layer soil |
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| DOI： |
| 中文关键词: p-y曲线 L-PILE 成层土体 ABAQUS 大直径单桩 |
| 英文关键词:p-y curve L-PILE layer soil ABAQUS big diameter monopile |
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| 中文摘要: |
| API规范推荐的p-y曲线是由均质土体得到的，并未考虑土层间相互作用，Georgiadis基于柔性桩提出了等效深度法修正p-y曲线，把均质土p-y曲线延伸到了成层土体中。为了研究p-y曲线和等效深度法对于大直径单桩在成层土体中的适用性，取四种典型地质条件：成层砂土、砂土-黏土-砂土、成层黏土和黏土-砂土-黏土，通过L-PILE软件计算了6m直径单桩基础的p-y曲线、桩顶水平荷载-位移曲线、桩身位移和弯矩。并与ABAQUS建立的单桩基础三维有限元模型计算结果进行比较。结果表明等效深度法对于成层砂土影响不大；对于成层黏土影响较大；对于中间为软弱土层的成层土体，在荷载较大时影响显著，等效深度法计算结果更加接近FEM结果。在成层土体中，p-y曲线应用于大直径单桩对于砂土高估了初始刚度，低估了极限抗力；对于黏土则低估了初始刚度和极限抗力。 |
| 英文摘要: |
| The p-y curve ,recommended by API code ,is obtained by homogeneous soil without considering the interaction of layer soil .Based on the flexible pile, Georgiadis proposed to the equivalent depth method to correct the p-y curve, the equivalent depth method extends the p-y curve of homogeneous soil into the layer soil. In order to research the applicability of p-y curve and equivalent depth approach to large diameter monopile under layer soil, the p-y curve, horizontal load-displacement curve, displacement and bending moment of 6m diameter monopile under four typical geological conditions: layer sand, sand-clay-sand, layer clay and clay-sand-clay are calculated by L-pile. And compared with the results of ABAQUS’s three-dimensional finite element model of monopile foundation. It is demonstrated that the effect of the equivalent depth approach is limited for the layer sand and obviously for the layer clay. For the layer soil in which a weak soil layer is located between two stronger layers, the equivalent depth method’s influence is significant and results are closer to the FEM result under big horizontal force. In the layer soil, the p-y curve overestimates the initial stiffness and underestimates the ultimate resistance of sand for the large diameter monopile,for the clay, the p-y curve underestimates the initial stiffness and the ultimate resistance. |
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