土工格栅在南水北调进水闸边墩结构中的应用

Application of Geogrid in South-to-North Water Diversion Intake Gate Side Pier Structure

南水北调永定河倒虹吸进口水闸位于北京市丰台区永定河卢沟桥下游大宁库区底副坝中间,水闸边墩高16.8m。为防止两侧回填土对闸墩挤压,向内变位,造成闸门启闭困难,施工中采用了土工格栅加筋挡土墙方案。本文对加筋土的力学原理、料质要求及施工工艺进行了论述,总结了土工格栅施工中若干注意事项,为在类似的结构工程中应用土工格栅加筋土技术提供了借鉴。

South-to-North Water Diversion Yongding River Inverted Siphon intake gate is located in the middle of auxiliary dam on the bottem of the Daning Reservoir area, Downstream Part of Lugou Bridge, Yongding River, Fengtai District, Beijing. The height of the side pier of the gate is 16. 8m. Geogrid reinforced retaining wall program is adopted in construction in order to prevent gate piers from squeezing effect of backfilling soil on both side, thereby causing inward deformation and difficult gate opening and closing. Reinforced soil mechanical principles, material quality requirements and construction techniques are discussed in the paper, several precautions in geogrid construction are summarized, thereby providing references for applying geogrid reinforced soil technology in similar structure pi-ojects.