在深基坑中围护应用土钉支护技术

随着深基坑支护技术的发展．越来越多的新技术应用在深基坑支护上，土钉墙支护技术由于具有经济性、施工快捷等优点而被广泛采用。从土力学中的土压力理论分析入手，分析支挡结构在土压力下的力学反应。结合工程实例，介绍土钉支护适用范围、施工技术（包括钻孔、土钉杆体组装及安放、注浆、面层挂网、喷射混凝土和面层承压板施工，最后，比较土钉墙支护和灌注桩同护施工方法，得出前者在成本、工期和环保三方面具有明显优势的结论。

Application of soil nailing technology on retaining structure in deep foundation pit

With the development of deep foundation pit support technique, more and more new techniques are being adopted. Soil nailing wall support technique has gained wide application because it is economical and time-saving in construction. Based on earth pressure theory, it analyzes the mechanical reaction of the supporting and retaining structure under earth pressure. With an actual case, it presents the applicable scope and construction technologies （including drilling, assembling and laying of the soil nailing rod, grouting, surface wire mesh, shotcrete and installation of surface bearing plate） of soil nailing wall support technique. Last, a comparison is made between soil nailing supporting technique and bored pile supporting technique, in which the former has obvious advantages in such three aspects as cost, duration and environmental protection.