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为研究砂土中变水平荷载作用下弹性长桩的基本性能,探讨桩与桩侧土抗力之间的相互作用,本文对设有传感器的模型桩在水平荷载作用下进行了试验;并对所取得的荷载与变形以及在各级荷载下桩的水平位移、弯矩和桩侧土抗力等主要成果进行了分析;还着重讨论了侧向基床系数k的模式。试验表明,基床系数随入土深度的变化规律采用k=c+my~n可以使水平位移、弯矩的实测值与理论分析值相吻合。同时,试验还证实了随着荷载的增加、位移加大,侧向基床系数的值也随之降低,砂的非线性特性是明显的。
In order to study the basic performance of elastic long-pile under variable horizontal load in sandy soil, and to explore the interaction between pile and soil resistance of lateral piles, this paper tests the model pile with sensor under horizontal load. The main results of load and deformation and the horizontal displacement, bending moment and lateral soil resistance of piles under different loads were analyzed. The model of the lateral bed coefficient k was also discussed. The test shows that the variation law of the bed coefficient with the depth of the soil can be adjusted by using k=c+my~n to make the measured value of the horizontal displacement and the bending moment agree with the theoretical analysis value. At the same time, the test also confirmed that as the load increases and the displacement increases, the value of the lateral subbed coefficient also decreases, and the non-linear characteristics of the sand are obvious.