Construction Control of Underground Comprehensive Utility Tunnels under Geological Conditions of High-Water Level Fine Sand

以江东大道地下综合管廊工程为依托，系统研究了高水位粉细砂地层下，基坑底以下5 m范围内采用三轴搅拌桩进行水泥土体加固，基坑内外管井预降水，基坑采用SMW工法桩支护，采用CPS-CL反应粘结型高分子湿铺防水卷材的施工工艺，取得了良好的工程效果。Based on the Jiangdong Avenue underground comprehensive utility tunnel project, this study systematically investigated the use of tri-axial mixing piles to reinforce the cement soil within 5 meters below the pit bottom in a high-water level fine sand stratum. The project also involved pre-dewatering inside and outside the pit using tube wells and using SMW method piles for pit support. Additionally, CPS-CL reactive bonding high molecular wet-laid waterproof membrane was employed, achieving excellent engineering results.