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锚板上拔过程中板周土体变形破坏机理的研究对锚板极限承载力的可靠预测至关重要。通过室内模型试验,采用数字图像关联技术对锚板上拔过程中锚板周围土体的变形场进行了研究。分析结果表明:在锚板上拔过程中锚板周围土体伴随着剪胀现象,其应力水平、峰值摩擦角和剪胀角控制着破坏面的形状,进而影响着锚板的极限承载力。在此基础上,建立了锚板承载力计算模型。通过引入Bolton理论所建立的剪胀角、相对密实度和应力水平之间的关系,得到了锚板极限承载力的理论计算公式。该理论公式考虑了埋深率、剪切摩擦角、剪胀和应力水平等影响因素,可对不同密实度砂土中锚板的极限承载力进行预测。理论公式与其他学者的试验结果对比表明该理论模型计算结果与其他学者的试验结果有较好的一致性,验证了该理论模型的合理性。
The research on the deformation and failure mechanism of soils around the plate during the process of anchor plate pull-out is of crucial importance for the reliable prediction of the ultimate bearing capacity of the anchor plate. Through the indoor model test, the deformation field of the soil around the anchor plate during the process of pulling up the anchor plate was studied by digital image correlation technique. The analysis results show that the soil around the anchor plate is dilated along with the stress level, the peak friction angle and the dilatancy angle control the shape of the failure surface, which affects the ultimate bearing capacity of the anchor plate. On this basis, the calculation model of anchor plate bearing capacity is established. By introducing the relationship between dilatancy angle, relative density and stress level established by Bolton theory, the theoretical formula of ultimate bearing capacity of anchor plate is obtained. The theoretical formula takes into account factors such as depth of burial, shear friction angle, dilatancy and stress level, and can predict the ultimate bearing capacity of anchor plates in different compacted sandy soils. The comparison between the theoretical formula and the experimental results of other scholars shows that the calculated results of the theoretical model are in good agreement with those of other scholars and the rationality of the theoretical model is verified.