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以黄泛区平原低液限土为研究对象,在对比、分析了原状土与重塑土的一维单向固结压缩曲线形态后认为:黄泛平原低液限土是一种具有结构性的土,且经试验结果证实土的结构强度较弱。经采用双对数坐标法和还原曲线法来确定土的结构屈服应力及先期固结压力,结果证实:1双对数坐标法同样适用于低液限土的结构屈服应力求解;2传统试验方法及Casagrande法确定结构性低液限土的先期固结压力是不合适的;同时初步探讨了黄泛平原土的结构性特征。
Taking the low liquid limit soil in the plain of the Yellow River Basin as the object of study, the one-dimensional unidirectional consolidation compression curve of undisturbed soil and remolded soil was analyzed and compared. It is concluded that the low-liquid-limit soil in the Yellow River plain is a structurally Of the soil, and the test results confirm the structural strength of the soil is weak. The double logarithmic coordinate method and the reduction curve method were used to determine the structural yield stress and preconsolidation pressure of the soil. The results show that: 1 double logarithmic coordinate method is also applicable to the structure yield stress solution of low liquid limit soil; 2 traditional test methods And Casagrande method to determine the preconsolidation pressure of structural low liquid limit soil is not appropriate. At the same time, the structural characteristics of the Huangfan plain soil are preliminarily discussed.