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将长的塑料排水板与短的水泥土搅拌桩联合处理的方法称为长板-短桩工法,为了更好地将该工法应用于海相软土地区,采用岩土三维有限差分软件FLAC3D,建立长板-短桩复合路基数值分析模型,研究了搅拌桩的桩长、桩间距和桩径对路基沉降、搅拌桩轴力的影响.研究结果表明:数值计算得到的结果跟现场沉降观测值比较接近,证明了模型建立和材料参数选取的正确性.路基沉降随桩长和桩径增加而减小,随桩间距增加而增大.搅拌桩桩身上部存在桩侧负摩阻力,桩身轴力随深度增加而先增大后减小.桩间距增大时,桩身轴力略微增大;随桩径增加,不同深度桩身轴力均增大.研究成果可为该工法的推广应用提供工程经验参考.
In order to better apply the method to the marine soft soil area, the geotechnical three-dimensional finite difference software FLAC3D is used to establish a long-plate-short pile method by combining the long plastic drainage board with the short cement-soil mixing pile. The effect of pile length, pile spacing and pile diameter on subgrade settlement and pile axial force are studied.The results show that the numerical results are in good agreement with the observed values of on-site settlement Which proves the correctness of model establishment and material parameter selection.The subgrade settlement decreases with the increase of pile length and pile diameter and increases with the increase of pile spacing.The negative friction of pile side in the pile of mixing pile exists and the pile shaft The force first increases and then decreases with the increase of depth.The axial force of pile body increases slightly when the pile spacing increases.The axial force of pile body with different depth increases with the increase of pile diameter.The research results may be the popularization and application of this method Provide engineering experience reference.