复合土钉墙在某基坑支护中的应用研究

The Application and Analysis of Composite Soil-nailing wall in a Pit

复合土钉墙是由止水帏幕、超前支护及土钉三者组成的复合型的土钉支护方式。某基坑所在地区位于长江漫滩地带,上覆土层主要为沼泽相～漫滩相的饱和软黏性土,具有的高含水量、高压缩性、高灵敏度等特性。常规土钉墙在杂填土、没有自稳能力的淤泥和淤泥质土层不能单独应用,故采用常规土钉墙+深搅桩+预应力锚杆结合使用的"复合式土钉墙"解决以上问题,取得了良好的效果。结合"复合式土钉墙"在某基坑工程中成功应用的实例,介绍其施工工艺和机理,为软土基坑支护摸索出一条新的方法。

Composite soil-nailing wall is a new support method which is composed of water proof wall, advancement support and nailing retaining wall. The stratum of West Bank Region in Nanjing, pertaining to Changjiang flood plain belt, is saturated soft clay which has properties of high moisture content, high compressibility and high sensitivity. The general soil nailing support is not suited to the miscellaneous fill, unstable silt and mucky soils. Therefore, composite soil-nailing wall is proposed to solve the problem in the area. Composite soil-nailing wall was applied on the pit supporting of the construction of one Uptown in West Bank Region in Nanjing, which gained excellent achievements, This article introduces the craft and mechanism of composite soil-nailing wall according to the engineering practice. And though the data got from the engineering practice, we can get the conclusion that the composite soil-nailing wall is an effective support method.