天津地铁1号线东延伸线支护体系的技术经济比较

Tianjin Metro Line 1 East extension line support economic and technical comparison protection system

天津地铁1号线东延伸线洪泥河桥站为地下两层框架结构,主体结构基坑宽20.7m,基坑深约16m。该场地站址及周边为农田和鱼塘,上部地层工程地质条件较差,存在淤泥质土等软弱地层。车站基坑施工可采取两种支护结构形式,第一种为地下连续墙支护结构形式,第二种为钻孔灌注桩+高压旋喷桩止水帷幕的支护结构形式。该文对这两种基坑支护形式从技术、经济两方面进行了分析比较。分析结果表明,该场地条件下地下连续墙的支护形式从技术、经济两方面均优于钻孔灌注桩+高压旋喷桩止水帷幕的支护结构形式,因此该车站基坑最终采用地下连续墙的支护结构方案。

Research purposes：Tianjin Metro Line 1 East extension line Hongni River Bridge station for underground two layer frame structure, the main structure of deep foundation pit is 20.7 meterswide, about 16 meters. The site location and the surrounding farmland and fish ponds, geological conditions of formation of upper poor engineering, there is mud soft stratum. Station foundation pit construction can adopt two kinds of supporting structure form, the first underground continuous wall supporting structure form, second for Bored Pile with high pressure jet grouting pile water stop curtain wall supporting structure. Both of the two kinds of bracing structure of foundation pit from two aspects of technology and economy were analyzed and compared. The analysis results show that, the site condition of underground continuous wall supporting form from two aspects of technology and economy are better than that of bored pile with high pressure jet grouting pile water stop curtain wall supporting structure form, so the station foundation pit with underground continuous wall supporting structure scheme.