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通过4根全长黏结螺纹玻璃纤维增强聚合物(GFRP)抗浮锚杆在长期荷载作用下的拉拔蠕变试验,研究GFRP抗浮锚杆抗拔的蠕变力学模型,计算出模型中的蠕变参数并对模型的正确性进行验证。另外,引入时间损伤效应的概念,结合蠕变力学模型推导出GFRP抗浮锚杆的长期抗拔力。结果表明,中风化花岗岩中GFRP抗浮锚杆在40%的极限荷载下才发生蠕变,GFRP锚杆在低荷载水平下蠕变性能优良,能够满足工程需要;Burgers力学模型能够很好地描述GFRP抗浮锚杆的蠕变规律,模型预测结果与试验结果具有较好的吻合程度,且随着拉拔荷载的增大,模型中的各力学参数均逐渐减小;建立的蠕变损伤模型用于预测GFRP抗浮锚杆的长期抗拔力具有较好的适用性。
The drawing creep test of four full-length GFRP anti-floating anchor rods under long-term load was carried out. The creep mechanical model of anti-floating anchor rod GFRP was studied, Creep parameters and verify the correctness of the model. In addition, by introducing the concept of time damage effect and combining with creep mechanics model, the long-term anti-pull force of GFRP anti-floating anchor was deduced. The results show that the GFRP anti-floating anchor in the weathered granite creeps only under the ultimate load of 40%, and the GFRP anchor has excellent creep performance under low load, which can meet the engineering requirements. The Burgers mechanical model can describe well GFRP anti-floating anchor creep law, the model prediction results with the test results have a good fit, and with the increase of drawing load, the model of the mechanical parameters are gradually reduced; established creep damage model Used to predict long-term anti-floating GFRP anti-floating anchor force has good applicability.