重复荷载作用下岩锚体系力学特性和粘结性能的试验研究
首发时间:2012-10-19
摘要:为了探讨岩锚体系在重复荷载作用下的性能,本文设计了两组室内试验。试验中采用钢筋锚固混凝土基体模拟岩锚体系。通过对该体系施加重复荷载,得到了在重复荷载作用下锚的拉拔力与位移的全过程,以此建立了4个阶段的力与位移的关系,并提出了对应于各个阶段的临界位移值;利用预埋在体系内部的应变片,实测了钢筋-混凝土界面的粘结应力分布及其变化规律,提出了在重复荷载作用下的钢筋-混凝土界面的粘结应力分布特点。结合本文试验结果,提出了重复荷载作用下岩锚体系的设计建议。
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Experimental research of mechanical behavior and bond performance on rock-anchor system subjected to repeated load
Abstract:In order to understand the performance of rock-anchor system under repeated load, two tests were carries out. In the tests, the rock-anchor system was modeled by anchoring steel bar into concrete block, and then repeated load was acted on the system. From the tests, a full relation between load and displacement for the system has been obtained, a force-displacement constitutive relationship with 4 phases was developed, and critical displacements corresponding to the 4 phases were proposed. By using embedded foil gauges, bond shear stresses were measured and the distribution of bond shear stress along the bar was achieved. Hereby, characteristics of bond shear stress on steel-concrete interface under repeated load were proposed. Based on the results, design recommendations of rock-anchor system under repeated load were proposed.
Keywords: rock-anchor system pull-out test repeated load mechanical behavior bond performance
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