淤泥土工管袋筑堤方案设计及效益分析

Scheme design and benefit analysis of silt geotextile tube embankment

针对巢湖航道口门拦门沙问题,根据口门现场工程建设条件,采用现场试验、计算验算及效益分析方法,对疏浚淤泥充填管袋筑堤设计方案进行研究。现场充填试验结果表明2.8 m×1.6 m×0.6 m扁平管袋方案在脱水效率和堆叠稳定性方面较优;计算结果表明导堤设计方案的整体稳定性具有足够的安全储备,最大沉降发生在堤心处,沉降量约为88 mm,堤心与堤脚沉降差约为15 mm,且设计波浪荷载下设计方案满足袋间抗滑稳定要求;效益分析表明淤泥土工管袋脱水筑堤方案可节约成本20%以上,且具有较大的环境和社会效益。

To solve the problem of mouth bars at the entrance of Chaohu waterway,this paper studies the design scheme of silt geotextile tube embankment with a field test,calculation check and benefit analysis under the on-site engineering construction conditions of the entrance.The field filling test results indicate that the 2.8 m × 1.6 m × 0.6 m flat geotube scheme is better in dehydration efficiency and stacking stability.The calculation results show that the overall stability of the jetty design scheme has sufficient safety reserves.The maximum settlement(about 88 mm)occurs at the embankment core,and the settlement difference between the core and the toe of the embankment is about 15 mm.In addition,the design scheme meets the requirements of anti-slip stability between geotextile tubes under the design wave load.The benefit analysis manifests that the silt geotextile tube embankment scheme can save more than 20% of the cost,and it has great environmental and social benefits.