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依托黄河冲积平原区某电厂工程项目,对工程场地进行原位测试和室内土工试验,研究了PHC管桩对地基土的挤密效应。结果表明,随着桩径向距逐渐变小,土体受到的挤密效果逐渐增强;随着粘粒含量的增加,土体受到的挤密效果逐渐减弱,对粉土和砂土的挤密效果明显强于粘性土;PHC管桩可消除桩间地基土液化性和提高其强度,使桩区附近土体液化等级降低,但其作用随距离增大而减小。
Relying on a power plant project in the alluvial plain of the Yellow River, the in situ test and the indoor geotechnical test of the project site were conducted. The crowding effect of the PHC pipe pile on the foundation soil was studied. The results show that with the decreasing of the radial distance of the pile, the squeezing effect of the soil gradually increases. With the increase of the clay content, the squeezing effect of the soil is gradually weakened, The effect is obviously stronger than that of cohesive soil; PHC pipe pile can eliminate the liquefaction of soil and increase the strength of soil, reduce the liquefaction grade of soil near the pile area, but its effect decreases with the increase of distance.