SMW工法桩在天津滨海软土地区的应用

The Application of SMW Method in the Coastal Soft Soil Region of Tianjin

由于场地工程地质条件和水文条件对基坑工程性状具有极大的影响,所以基坑工程具有很强的区域性。为研究SMW工法在天津滨海软土地区的应用情况,对天津滨海新区一座地下通道基坑工程为背景进行分析。采用专业设计软件同济启明星软件对基坑断面进行计算,同时与施工和监测情况进行比对。研究结果表明,天津滨海新区10m以下基坑采取SMW工法支护型式可行,围护结构只需要设置两道水平支撑;工法桩可以允许出现较大的变形,不会出现墙体开裂渗水的情况;在淤泥质土中,SMW工法桩成桩速度缓慢,需要合理安排工期,确保桩基强度。

Because the site geological conditions and hydrological conditions have great influence on foundation pit engineering, the foundation pit engineering is very strong regional. For the application study of SMW technique in Tianjin coastal soft soil area, an underground channel excavation engineering of Tianjin Binhai New Area is analysed as the background. Design software is Professional design software ＂Tongji Qimingxin ＂, and calculate results are compared with the construction and monitoring data. The results show that, in the coastal soft soil region of Tianjin, it is feasible to take SMW method for a foundation pit ten meters below, which only need to set up two horizontal supports in the depth direetion;SMW engineering pile can be allowed greater deformation than other region, which wont lead to serious wall crack and water seepage;In the muddy soil, SMW engineering piles＇ forming- speed is very slow, so the construction schedule must be arranged scientifically to ensure the piles have enough time to attain strength.