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以武汉沙湖粉质黏土为研究对象,首先借助于高压固结仪,对重塑土和原状土进行了室内侧限的固结试验;其次利用改进的应力控制式常规三轴仪,在不同的加荷路径和排水条件下,对重塑土和原状土分别进行了常规三轴试验研究,并对试验资料进行了较为系统的分析.结果表明:1)原状土的侧压力系数约为0.56,超固结比约等于1.2,为弱超固结土体,其结构屈服压力稍大于其前期固结压力;2)原状土初始的切线模量及其抗剪强度均高于重塑土相应的值;3)在固结排水条件下的三轴剪切试验,原状土的剪胀量要小于重塑土的剪胀量,但在固结不排水条件下,原状土体的剪胀趋势却明显要高于重塑土的剪胀趋势.
Taking the sandy clay of Wuhan Sand Lake as the research object, firstly the consolidation experiment of the confined soil and undisturbed soil was carried out by means of the high-pressure consolidation instrument. Secondly, with the improved stress-controlled conventional triaxial apparatus, Under the loading path and drainage conditions, the conventional triaxial tests on the remolded soil and undisturbed soil were carried out respectively and the experimental data were systematically analyzed.The results show that: 1) the lateral pressure coefficient of undisturbed soil is about 0.56 , And the overconsolidation ratio is about 1.2. For the weak overconsolidated soil, its structural yield pressure is slightly larger than its preconsolidation pressure. 2) The initial tangent modulus and the shear strength of the undisturbed soil are both higher than that of the remolded soil The value of dilatancy of undisturbed soil is smaller than the value of dilatancy of undisturbed soil, but under the condition of undrained consolidated undrained condition, the tendency of dilatancy of undisturbed soil But obviously higher than the rebuilding trend of dilatancy.