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土钉轴力是土钉墙验算的重要内容,国内相关规范对土钉轴力的计算方法也在逐渐改进。基于FLAC3D软件进行数值模拟,分析了土钉轴力的分布规律,探讨了现行规程计算土钉轴力的适用性,并对经验调整系数取值影响因素进行了探讨,其结论对工程设计有参考价值。研究结果表明,以朗肯土压力理论为基础的土钉墙分析方法,在某些情况下并不能得到满意结果。土钉轴力的大小及分布规律,不仅与开挖面以上的土层有关,还与开挖面以下土层性质有关,现有的计算方法中未考虑这个因素。通过与模型试验结果比较,结论得到了部分验证。
The soil nailing axial force is an important content of soil nailing wall checking. The calculation method of soil nailing axial force is gradually improved by the relevant domestic norms. Based on the numerical simulation of FLAC3D software, the distribution rule of soil nailing axial force is analyzed. The applicability of the existing code for calculating soil nailing axial force is discussed, and the influencing factors of the value of experience adjustment coefficient are discussed. The conclusions are as follows: value. The results show that the soil nail wall analysis method based on Rankine’s theory of soil pressure can not get satisfactory results in some cases. The size and distribution of soil nail axial force are not only related to the soil above the excavation face, but also related to the nature of the soil below the excavation face. This factor is not considered in the existing calculation methods. Through the comparison with the model test results, the conclusion has been partially verified.