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根据孢粉、扫描电子显微镜、C14检测数据和前人的资料,确定了腐木淤泥混合土的成因环境和分布特征。通过分析揭普高速公路软基路堤施工期及运行期的实测沉降资料,结合成因环境,说明了采用袋装砂井进行深层处理含腐木软土地基的合理性及必要性。含腐木的软土地基在进行深层处理后,沉降发生早、收敛快,工后沉降小;不进行深层处理则沉降时间长,工后沉降大。
Based on the sporopollen, scanning electron microscopy, C14 detection data and previous data, the genetic environment and distribution characteristics of silt mixed soil were determined. By analyzing the measured subsidence data during the construction period and the operation period of the soft subgrade embankment on the Jiepu Expressway, the rationality and necessity of deeply processing the soft soil foundation with the sacked wood using the bagged sand well are explained based on the causal environment. Subsidence occurs soon after the deep treatment of soft soil foundation with rotten wood, convergence fast, post-construction settlement is small; without deep processing, the settlement time is long, large post-construction settlement.