复合土钉墙技术的研究及应用

Development of composite soil nailing walls

介绍了复合土钉墙的4种主要模式,对它们的适用条件、设计计算方法及构造型式进行了论述,并结合工程实例,对复合土钉墙在复杂地质条件下的使用状况进行了阐述。

Four new types of composite soil nailing walls are introduced. These composite walls include combinations of soil nailing with prestressed anchors, with cut-off wall (deep mixing piles or jet grouting piles) and prestressed anchors, with micropiles and prestressed anchors, and with prestressed anchors, cut-off wall and micropiles. Conditions under which each of the four combinations is applicable are stated in detail. Design and methods using a circular sliding surface to check the overall stability and the method of pullout resistance of soil nailing are presented. The structural characteristics of soil nail, cut-off wall, prestressed anchor and micropile are also introduced. Finally, a successful example using composite soil nailing wall is described. In this example, the composite soil nailing was used as a shoring system for deep foundation pit excavation at a site where difficult geological conditions exist.