大型疏浚土充填袋筑堤技术研究

Embankment construction technology using large geotextile bags filled with dredged soil

为缓解砂石资源紧缺、保护生态环境、降低工程造价和高效利用航道疏浚土,以大型疏浚土充填袋筑堤技术应用于连云港港徐圩港区围堤建设为工程实例,通过稳定性分析计算、离心模型试验开展了大型疏浚土充填袋筑堤技术的理论可行性研究,并结合原型试验提出了新型配套施工工艺,形成了相关成套技术。研究表明:袋体土工织物加筋作用良好,堤体及地基稳定性能够满足安全设计;控制疏浚土充填料初始含水率、采用泥浆泵与浓浆泵串联接力的施工工艺,能够提升大型疏浚土充填袋筑堤施工效率,满足正常围堤建设强度需要;低含水率疏浚土充填料排水较快、袋体实际有效厚度较为理想、堤体地基较为稳定,大型疏浚土充填袋筑堤具有其技术可行性。

The application of embankment construction technology using large geotextile bags filled with dredged soil in Xuwei port area of Lianyungang is discussed in order to solve the lack of rock and sand resources, to protect the eco-environment, to reduce the project cost and to utilize the dredged soil from channel efficiently. The theoretical feasibility of this technology has been proved by numerical modeling of stability and centrifugal model tests. The complete new construction technology is proposed based on the prototype tests. During the construction and operation periods, the embankment construction using large geotextile bags filled with dredged soil and the embankment foundation stability satisfy the safety requirements. The water pressure in the geotextile bags dissipates quickly in the whole construction process. The compression and ratio of filling bags can satisfy the requirement of embankment construction. The stress of geotextile bags is less than the strength of its allowable range. The geotextile bags can be maintained completely.