A calculation program was developed with Visual Basic 2005 based on a comprehensive consideration of many factors, such as lateral pressure, designed internal forces, anti-pulling force, and overall stability of soil nailing. In this study, the stabilities of unsupported and supported slopes were evaluated separately for the calculation of the overall internal stability. As the distribution of the anti-pulling force of soil nailing is independent of the soil slices, the most dangerous circular sliding surface changes at each stage if interaction between soil and nailing is considered. The program enables a dynamic search of the most dangerous circular sliding surface of a supported slope. The engineering applications indicate that the program contains all the design and calculation contents for the soil nail bracing, and can also present visual graphics simultaneously during the calculation. The program is visual and can be easily implemented. It is efficient when it comes to foundation pit engineering and can provide useful references for civil engineers.%综合考虑土钉侧压力、土钉设计内力、土钉抗拔力及土钉墙稳定性等多方面因素,基于VB2005开发了土钉支护设计计算程序.对于土钉墙稳定性计算,分别评判原始边坡稳定性及支护后边坡稳定性,土钉抗拔力分布与所分土条数无关,考虑钉土相互作用后,最危险圆弧滑动面将有所变化,程序实现了支护后最危险圆弧滑动面的动态搜索.工程应用表明:程序涵盖了全面的土钉支护设计计算内容,计算完成的同时即可绘制图形,形象直观,操作简便,可应用于基坑和边坡工程.
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