基于锚杆抗拔试验的动态折线模型分析

发布时间：2018-12-14 01:03

【摘要】：根据抗拔锚杆试验数据,建立了锚固体荷载传递特性随锚固深度变化的动态折线数值计算模型。首先,对锚杆抗拔试验进行了简单介绍,给出了试验的主要参数及数据;在此基础上,对试验中抗拔锚杆不同深度处锚固体荷载传递曲线进行了对比分析和讨论,提出了用以拟合计算的动态折线模型;然后结合锚杆轴力及位移计算能量法计算式对试验数据进行了拟合计算,计算结果与试验数据吻合,显示在拟合计算中动态折线模型使用合理;最后通过讨论明确了动态折线模型的适用条件,说明了其在试验分析及工程设计中的辅助作用。动态折线模型反映了不同深度地层中地应力变化对锚侧阻力的影响,虽然在计算中没有直接引入地应力,但其以试验为基础的参数设置和相对简单的迭代计算,为更精细的计算锚杆承载力提供了参考。
[Abstract]:Based on the test data of uplift anchor rod, a dynamic broken line numerical model is established to calculate the load transfer characteristics of anchor body with the change of anchoring depth. First of all, the test of anchor rod pull-out is simply introduced, and the main parameters and data of the test are given. On this basis, the load transfer curves of anchors at different depths in the test are analyzed and discussed, and a dynamic broken line model for fitting calculation is proposed. Then the test data are fitted and calculated by combining the calculation formula of axial force and displacement of anchor rod, which shows that the dynamic broken line model is reasonable in fitting calculation. Finally, the applicable conditions of the dynamic broken line model are clarified, and its auxiliary role in the test analysis and engineering design is explained. The dynamic broken line model reflects the influence of the variation of in-situ stress on the resistance of the anchor side in different depth strata. Although there is no direct introduction of in-situ stress in the calculation, the parameter setting based on the experiment and the relatively simple iterative calculation are carried out. It provides a reference for calculating the bearing capacity of anchor rod.
【作者单位】：中南林业科技大学岩土工程研究所;中南大学土木工程学院;湖南大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(No.51108470) 湖南省科技计划资助项目(No.2011TT2061)
【分类号】：TU476

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