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负斜桩顶部水平受拉响应及p-y曲线特征试验研究
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Experimental Study on Tensile Response and p-y Curve Characteristics of Negative Batter Pile under Top Horizontal Tension
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    摘要:

    为研究倾斜桩的水平受拉响应特征,在模型砂土中设置0°、10°、20°倾斜桩及桩底嵌岩20°倾斜桩,桩顶施加水平拉力,拉力方向与倾斜方向相反,测试4根模型桩的水平位移、应变片与土压力盒应变,获得桩身水平位移、弯矩、土抗力和p-y曲线特征随倾斜角和桩底约束条件的变化规律. 结果表明:1)桩顶水平受拉时,随着倾斜角的增加,负斜桩顶部水平位移逐渐增大,弯矩峰值随之增大,而土抗力峰值逐渐减小,土抗力峰值点位置逐渐降低,单桩的水平承载力随之降低,抗弯能力减小;2)随着桩底约束程度的提高,负斜桩顶部水平位移减小,桩身弯矩峰值、土抗力峰值减小,单桩水平承载力增大,抗弯能力增强;3)水平荷载作用下,本模型的负斜桩破坏模式为“转动+弯曲”,转动点位置随倾斜角的减小或桩底约束程度的提高而下降;4)0°~20°负斜主动桩p-y曲线可采用p/pub= α(y/y50) β进行拟合,倾斜角与桩底约束程度对α影响不大,倾斜角对β值变化幅度影响较小,β值变化幅度随桩底约束程度提高而降低.

    Abstract:

    In order to study the response characteristics of the battered pile under horizontal tension, the 0°, 10°, 20° battered pile and rock socketed 20° battered pile at the pile bottom were set in the model sand, the horizontal tension load was applied on the pile top, the tension direction was opposite to the inclination direction, the horizontal displacement, strain gauge and earth pressure box strain of four model piles were tested, and the variation rules of horizontal displacement, bending moment, soil resistance and p-y curves characteristics with inclination angle and constraint conditions of pile bottom were obtained. The results show that: 1) when the pile top is subjected to horizontal tension, with the increase of the inclined angle, the horizontal displacement at the top of the negative battered pile gradually increases, and the peak value of the bending moment increases. But the peak value of the soil resistance decreases gradually, and the depth of the soil resistance peak point decreases gradually, and both the horizontal bearing capacity and the ability to resist bending of the single pile also decrease. 2) With the increase of pile bottom restraint, the horizontal displacement of negative battered pile top decreases, the peak values of pile bending moment and soil resistance decrease, and both the horizontal bearing capacity and the ability to resist bending of single pile increases. 3) The displacement mode of the model negative batter pile under horizontal tension is "rotation + bending", and the position of the rotation point is reduced with the increase of inclination angle or pile bottom constraint degree. 4) The p-y curves of 0° ~ 20° negative battered active pile can be fitted by p/pub=α(y/y50)β, and the inclination angle and pile bottom constraint degree have little effect on α. The inclination angle has little influence on the variation range of β value, and the variation range of β value decreases with the increase of pile bottom constraint.

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周德泉 ?,蔡强 ,王创业 ,朱沁 ,周毅 ,李留玺 ,刘海龙.负斜桩顶部水平受拉响应及p-y曲线特征试验研究[J].湖南大学学报:自然科学版,2023,(1):198~207

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  • 在线发布日期: 2023-02-16
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