基于锚杆抗拔试验的动态折线模型分析

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。

Analysis of dynamic broken line model based on experimental data of anchor anti-pullout

According to the anti-pullout anchor experimental data, the dynamic broken line model that the anchorage load transfer properties changing with the depth is presented. Firstly, the anti-pullout anchor experiment, including the main parameters and test data, is briefly introduced. Based on that, anchorage load transfer curves of different depths are analyzed and dynamic broken line used for fitting calculation is proposed. Then, by using dynamic broken line model and anchorage axial force and displacement energy method formulas, a matching computation of test data is carried out. The results show that the calculation results coincide with the experimental data. It vindicates that using the dynamic broken line model in fitting calculation is reasonable. At last, applicable conditions and the supplementary role of the dynamic broken line model in test research and engineering design are discussed. The distribution of different depth strata geostresses is considered by the dynamic broken line model. Geostress is not directly involved in the calculation, but because of its parameter setting based on the test and relatively simple iterative calculation; the method provides a feasible reference to compute the anchor bearing capacity more sophisticated.