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抗拔锚板上拔过程是一个复杂的锚土相互作用过程,锚板周围土体在上拔过程中的变形破坏机制对于抗拔锚板基础的极限承载力研究具有重要意义。基于PIV(particle image velocimetry)无干扰测量技术对砂土中方形锚板上拔过程中变形场进行了测量分析,研究了抗拔锚板群锚基础的破坏机制。试验结果表明:锚板间距对群锚破坏面的形状有着重要影响;在临界间距内,以锚板上部1倍边长为拐点,剪切带先内倾然后外倾向上贯通到土体表面,群锚效应系数与S/B为线性关系,由此预测出群锚效应达到100%时的锚板间距;达到临界间距后,每个锚板的剪切场和单个锚板剪切场一致,试验结果可为群锚基础极限抗拔力的预测提供参考。
The process of pullout of anchor plate is a complex process of the interaction between anchor and soil. The deformation and failure mechanism of soil around anchor plate in the process of pullout is of great significance for the study of ultimate bearing capacity of the foundation. Based on PIV (particle image velocimetry) jamming measurement technique, the deformation field of square anchor plate in sand was measured and analyzed, and the failure mechanism of anti-pull anchor group base was studied. The results show that the distance between anchor plates has an important influence on the shape of the damaged surface of the anchors. Within the critical spacing, the upper edge of the anchor plate is used as the inflection point. The shear band is lean first and then extends outwardly to the surface of the soil. The anchor effect coefficient is linear with S / B, and the anchor spacing is predicted when the group anchoring effect reaches 100%. After reaching the critical spacing, the shear field of each anchor plate is consistent with the shear field of a single anchor plate. The test The results can provide a reference for the prediction of the ultimate pull-out force of group anchors.