基于粒子图像测速的锚板抗拔破坏机理试验研究
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TU433

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国家重点研发计划(2018YFC1505104);国家自然科学基金(41722209);苏州市科技计划(SYG201717)。


Experimental study on uplift failure of anchor plate based on PIV technology
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    摘要:

    锚板拉拔过程是板与周围土体相互作用的过程,研究锚板周围土体的变形破坏机制对锚板抗拔力的预测具有重要意义。基于粒子图像测速(PIV)技术开展了一系列锚板拉拔试验,试验结果表明:PIV技术可以有效地捕捉到不同砂土地基密实度和锚板埋深条件下锚板拉拔过程中周围土体的变形破坏模式。PIV位移场分析结果显示:锚板埋深较浅时,松砂地基中破坏模式呈现直面破坏,密砂地基中呈现斜面破坏;锚板埋深较大时,松砂地基中土体内部锚板上方形成灯泡形影响区,密砂地基中呈现曲面破坏。PIV应变场分析结果表明:无论砂土地基埋深如何,松砂地基中形成的剪切应变带与水平面夹角为45°+φ/2,密砂地基中形成的剪切应变带与垂直面夹角约为φ/4。

    Abstract:

    The uplift of anchor plates is of anchor-soil interaction process. The investigation into soil deformation and failure mechanism around the anchor plate is important for uplift capacity prediction. In this paper, a series of anchor plate uplift tests based on particle image velocimetry (PIV) technique have been carried out. The deformation fields and failure modes of soil around anchor plates have been obtained under different soil densities and embedment depths of anchor plates. The results of PIV displacement fields show that for shallow anchor plates, the failure modes of the loose and the dense sand foundation are characterized by frictional cylinder and truncated cone, respectively. When the anchor plate is deeply embedded, a bulb-shaped influence zone formed above the inner anchor plate in the loose sand foundation, and the dense sand foundation develops curved failure surface. The results of PIV strain fields show that whatever the embedment depth of anchor plates, the failure plane in loose sand foundation is inclined at an angle 45°+φ/2 with respect to the horizontal, and the angle between the failure plane and the vertical plane in dense sand foundation is approximately φ/4. The conclusions provide references for developing prediction models of anchor uplift behavior.

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倪钰菲,乔仲发,朱泳,朱鸿鹄.基于粒子图像测速的锚板抗拔破坏机理试验研究[J].土木与环境工程学报(中英文),2020,42(1):24-30.

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  • 收稿日期:2019-05-06
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  • 在线发布日期: 2020-03-07
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