地铁项目富水砂层高压旋喷桩技术应用研究

本文结合南京地铁五号线光华门站配套项目,在分析研究工程富水砂层地质和水文特点的基础上,深入研究了高压旋喷桩止水帷幕施工技术要点。并针对成桩质量问题,采取坑内袖珍阀导流和基坑外注浆加固的方法,有效解决了富水砂层地下水渗流问题。

Based on the supporting project of Guanghuamen Station of Nanjing Metro Line 5,this paper analyzes the geological and hydrological characteristics of the water-rich sand layer of the project,and studies the construction technical points of the water-stop curtain of high-pressure rotary blast pile.In view of the quality problem of pileing,the diversion of pocket valve in the pit and the reinforcement of grouting outside the foundation pit are adopted,which effectively solved the problem of groundwater seepage in the water-rich sand layer.