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长兴岛北沿新开北环河是长兴岛青草沙水库周边水系调整工程的最重要的部分,其平面布置根据划示的规划蓝线确定,大部分河段沿老海塘内侧布置。受青草沙水库蓄水影响,河道断面结构设计和河道的开挖施工方案均应考虑渗流稳定。本工程设计阶段通过建模数值计算对北环河渗流稳定进行分析,以确定河道的护砌范围并提出河道开挖过程中需采取的一些施工措施。
The north of Changxing Island along the newly opened Beihuan River is the most important part of the water system adjustment project around the Qingcaosha Reservoir in Changxing Island. The layout of the Changxing Island is determined according to the planned blue line. Most of the sections are arranged along the inside of the old seawall. Influenced by the impoundment of Qingcaosha Reservoir, the seepage stability should be considered when designing the structural design of river course and the excavation of watercourse. In the project design phase, the stability of Beihuan River seepage is analyzed by modeling and numerical calculation to determine the range of river protection and to propose some construction measures to be taken in the course of river excavation.