基于南昌红谷隧道工程干坞的邻江环境及深厚富水砂层地质条件，结合边坡支护的数值计算及干坞内抽排水模拟分析，选用现浇钢筋混凝土坡面防护+塑性混凝土防渗墙的支护防渗体系。经历了干坞内多次抽排水及汛期的考验，表明该支护防渗体系对环境的适应性强，防护效果可靠，防渗效果良好，造价低、施工便捷、维护工作量小，为管段预制工序提供了工期保证，也为整个工程如期完工提供了先决条件。

The castinsitu reinforced concrete and plastic concrete antiseepage system are adopted for support and antiseepage system of dry dock of Honggu Tunnel in Nanchang in waterrich sandy stratum adjacent to river based on numerical calculation of slope support and drainage simulation of inner dry dock. The multiple drainage tests and flood season show that the support and antiseepage system adopted for dry dock slope is reliable, adaptable, convenient and with good prevention effect, low cost and little maintenance work. The study can guarantee the construction schedule of the tube prefabrication and even the project.