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在工程实践中,排水垫层厚度、渗透系数等设计参数高度依赖经验,建筑规范[1]认为粉细砂不宜用于排水垫层。结合上海某围垦工程粉细砂排水垫层的实践与原位观测成果,借助于非线性有限元,对粉细砂排水垫层的特性进行研究,探讨垫层渗透系数、厚度、长度以及堤身相对透水性等主要因素对地基固结排水的影响。在此基础上,提出以导水系数作为垫层设计控制参数,并提出可以考虑以上几个主要因素的垫层设计公式,可为粉细砂取代中粗砂用于垫层设计及施工提供了技术支持。实践证明淤泥地基上利用粉细砂充填土工管袋作为排水垫层是可行的。
In engineering practice, the design parameters of drainage cushion thickness and permeability coefficient are highly dependent on experience. Building codes [1] consider that fine sand should not be used for drainage cushion. Combined with the practice and in situ observation of the fine sand drainage cushion in a reclamation project in Shanghai, the characteristics of the fine sand drainage pad were studied by using the nonlinear finite element method. The effects of cushion permeability, thickness, length, Relative permeability of the main factors such as the impact of consolidation drainage. On the basis of this, the design of control parameters of cushion design is put forward based on the coefficient of hydraulic conductivity, and the cushion design formula that can consider the above several factors is proposed. It can be provided for the design and construction of cushion for the replacement of coarse sand with fine sand Technical Support. It has been proved that it is feasible to fill the geotextile bag with silty sand as the drainage cushion on the silt foundation.