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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。
According to the test data of anti-pulling anchor rod, the numerical model of dynamic fracture line of load transfer characteristic of anchor with the change of anchorage depth was established. First of all, the bolt pull-up test is briefly introduced, and the main parameters and data of the test are given. On this basis, the load transfer curves of the anchor at different depths are compared and analyzed. The dynamic polyline model for fitting calculation is put forward. Then, the experimental data are calculated by the calculation method of axial force and displacement energy method. The calculated results are in good agreement with the experimental data. The dynamic polyline model Which is reasonable to use. At last, the applicable condition of the dynamic polyline model is clarified through discussion, and its auxiliary role in experimental analysis and engineering design is illustrated. The dynamic polyline model reflects the effect of in-situ stress changes in different depths on the anchorage-side resistance. Although no direct ground stress is introduced into the calculations, experimental-based parameter settings and relatively simple iterative calculations provide a more refined calculation Anchor capacity provides a reference.