二次注浆复合土钉墙在超深基坑支护中的应用

结合无锡地区典型的软土深基坑土钉墙支护工程实例，简要介绍了超深基坑中二次注浆复合土钉支护技术的应用及施工控制；并通过具体试验及监测结果，就二次注浆土钉的承载力情况及二次注浆土钉墙施工过程中支护结构的沉降、水平位移情况进行了分析总结，对其经济性进行了分析评价。

Application of Secondary Grouting Composite Soil Nailing Wall in Deep Foundation Pit Bracing

Based on the typical deep foundation pit bracing project in soft soil in Wuxi, the application of secondary grou-ting soil nailed wall for deep foundation pit bracing and construction control were introduced. The bearing capacity of sec-ondary grouting soil nail and settlement ＆ displacement of bracing structure during construction were summed up to analyze and evaluate the economic with the special experiments and monitoring results. It shows that the secondary grouting soil nailed wall is an economical, fast and safe bracing method which can greatly increase the hearing capacity and has no unfa-vorable influences on the bracing structures.