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吹填土往往具有含水率高、初始孔隙比大、压缩性大等特点,加固过程中渗透系数、压缩系数及渗流路径都会发生较大变化,加固过程中砂井以下土体在砂井排水通道和真空压力下也会发生固结。基于大变形固结理论,在流动柱体坐标系下,通过建立渗流连续方程,进而推导了能够同时考虑砂井加固层及下卧土层的未打穿砂井大变形固结控制方程,并采用有限差分方法对建立的方程进行了求解。结合黏土渗透压缩模型,利用研究成果对一吹填地基浅层加固工程进行了分析,计算结果与实测结果吻合较好,证明了计算方法的可行性。
Dredger filling often has the characteristics of high water content, large initial void ratio and large compressibility. The permeability coefficient, compressibility coefficient and seepage path will change greatly during the consolidation process. During the consolidation process, Consolidation also occurs under vacuum pressure. Based on the theory of large deformation and consolidation, the seepage continuity equation is established under the flow cylinder coordinate system, and then the governing equations of large deformation and consolidation of unspoken sand wells can be deduced simultaneously. The finite difference method is used to solve the established equation. Combined with the model of clay infiltration and compression, the research results are used to analyze the shallow reinforcement project of a dredger filled foundation. The calculation results are in good agreement with the measured results, which proves the feasibility of the calculation method.