超大型绞吸船长吹距黏土混姜结石复杂土质施工工艺

CompleXearthy construction process of clay mixed ginger stones blown long distance by ultra large cutter suction dredger

以连云港港赣榆港区10万吨级航道延伸段工程施工(HD-SG-2标段)为例,针对绞吸船在长吹距工况下(标准岸管长度7 km)施工4、5级黏土混姜结石的问题,从挖掘工艺、输送工艺两方面进行分析,在施工参数优化方面,在黏土混姜结石工况运用自动挖泥技术,通过多组参数对比分析,实现自动挖泥技术最优施工参数组合;并基于自动挖泥数据,修正施工流速与泥浆密度计算模型以及Durand水力梯度计算模型。结果表明,该技术的成功实施可提高超大型绞吸船长吹距输送黏土混姜结石产能的测算精度,并确定该类土质最优施工参数组合,保证该类土质在管道中输送的平稳性,避免堵管现象发生。

We take the construction project of the extension section of the 100,000-ton level channel in GanyUPort area of Lianyungang Port(HD-SG-2 bid section)as an example,aim at the problem of grade 4 and 5 clay mixed ginger stones when cutter suction dredger is working in long blowing distance(standard length of shore pipe is 7 km),analyze from the two aspects of excavation technology and transportation technology,use automatic dredging technology in the working conditions of clay mixed ginger stones in terms of construction parameters optimization,realize the optimal construction parameters combination of automatic dredging technology by the comparative analysis of multiple groups of parameters,and revise the construction flow rate and mud density calculation model and the Durand hydraulic gradient calculation model based on the automatic dredging data.The results show that the successful implementation of this technology can improve the calculation accuracy of the productivity of clay transported by the long distance of ultra large cutter suction dredger,determine the optimal combination of construction parameters of this kind of soil,ensure the stability of soil transportation in the pipeline,and avoid pipe blockage.