基于有限元强度折减法的土钉支护结构稳定性分析

Stability analysis of soil-nailing protection structure based on the strength-reduction FEM method

摘要:

土钉支护结构稳定性分析一直以来都是土钉支护结构设计中的关键验算项目，直接影响到土钉支护结构的正常运行。运用有限元强度折减法分析土钉支护结构稳定性，通过离心机模型试验验证了该方法的可行性，并针对工程实例将文中提出的方法和现行《规程》方法进行比较分析，对土钉支护结构稳定性及其影响因素进行了比较全面的分析。研究结果表明：采用文中方法得出的土钉间距和土钉直径对支护结构稳定性的影响要比《规程》方法大；土钉长度和土体强度参数对支护结构稳定性的影响与《规程》方法的结果基本一致。

Abstract:

The whole stability analysis of the soil-nailing protection structure has always been the key checking computation item in the design of the soil-nailing protection, which directly affects normal work of the soil-nailing protection structure. The stability of soil-nailing protection structure was analyzed using the strength-reduction FEM method and the feasibility of this method was validated by centrifuge model test. Then, this method was compared with current specification through a case study. Based on these, a set of analysis is implemented on the stability of soil-nailing protection structure and its effecting factors. The results show that the influence of the diameter and the spacing of the soil-nailing on stability of soil-nailing protection structure is greater than that obtained from the method in the specification. There is a good agreement between the present study and the specification method on the study of stability of soil-nailing protection structure influenced by the length of soil-nailing and the strength parameters of soil.