特殊基坑支护的设计和应用

Design and Application of Special Foundation Pit Support

以一临近人防通道复杂条件下复合土钉支护的设计为背景,介绍了复合土钉支护技术的概念和设计以及采用国际通用岩土工程分析软件FLAC对复合土钉支护进行的土钉内力和支护变形的分析结果,并和现场实测结果进行了比较。通过实测数据与理论计算值、数值模拟值的对比分析,表明土钉实际受力较现有常规计算方法计算出的数值明显要低,而略大于FLAC数值模拟结果,探讨了现有计算方法的不足,证明了在复杂条件下的复合土钉支护用FLAC软件进行支护的变形、内力分析和支护的优化设计,可得到很好的效果。

This article discusses the design of composite soil-nailing in deep foundation pit under complex surroundings. To check if the design can fit the needs of little deformation, an analysis software, FLAC, is used to predict the displacement and the interior force in soil nails. Results of numerical analysis show that the results are very close to the in-situ measurements surveyed lately in the construction. Furthermore, a comparison about the interior force in soil nails between the numerical analysis and the traditional methods is made. The measurements show that the numerical analysis may be more accurate than traditional methods.