长江南京以下12.5 m深水航道工程新型筑堤结构

New type of dam structure for 12.5m deep-water channel project in the Yangtze River below Nanjing

针对长江南京以下12.5 m深水航道二期工程落成洲河段整治建筑物的特点,提出在堤高为3.0~6.5 m的堤段采取倒T型构件混合堤替代抛石斜坡堤的新型筑堤结构。对混合堤结构在波、流共同作用下的稳定性采用翻坝水流力和合田波浪力计算公式进行理论受力分析,并通过三维物理模型试验对波、流共同作用下混合堤结构稳定性进行验证,结果判定为稳定。新型倒T型构件混合堤减少块石用量,有利于缓解大宗石料供应难度,适应环保需求,同时减少水上施工时间,加快施工进度。该结构已成功申请实用新型专利,可为类似工程提供指导和借鉴。

Aiming at the characteristics of regulating structures in the 12. 5 m deep-water channel project（ phase II） at Luochengzhou section in the Yangtze River below Nanjing,we adopt a new type of inverted T-shaped member mixed dam to replace the riprap slope dam at the dam height from 3. 0 m to 6. 5 m section.We analyze the stability of the structure under the action of wave and current by theoretical analysis using the flow force across dam crest and Goda formula.We also use the three dimensional physical model test to verify the stability of the mixed dam structure under the combined action of wave and current,and the result is judged as stable. The new type of inverted T-shaped member mixed dam reduces the amount of block stone,which is beneficial to ease the difficulty of supply of stones and adapt to environmental protection requirements,while it can reduce the construction time on water and accelerate the construction progress. The structure has successfully applied for utility model structure patents,which can provide guidance and reference for similar projects.