摘要
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.
Silty clay samples taken 9.5 m beneath ground level from Shahu in Wuhan were mainly test- ed. Firstly, the high pressure eonsolidometer was used to conduct the ko consolidation tests for both sam- ples of natural silty clay and those of remoulded silty clay respectively. Secondly, stress controlled triaxial shear device was also used to test the samples of natural and remoulded silty clay along different loading paths under different drainage conditions. All testing data were analyzed and studied in detail. Experi- mental results show that ： 1 ） natural silty clay is overconsolidated soil with OCR and lateral pressure coef- ficient being 1.2 and 0.56 respectively, and its structure yield strength is a little bit bigger than its pre- consolidation pressure; 2） initial elastic modulus and shear strength of the natural soil are both higher than corresponding values of the remoulded soil ; 3 ） for triaxial shearing under consolidated drainage con- ditions, the dihancy values causing volume increment of natural samples are usually smaller than the cor- responding values of remtsiltoulded soil samples; but for triaxial shearing under consolidated undrainagestatus, the diltancy tendency for volume increment of the natural soil samples is more obvious than the corresponding dihancy tendency of the remoulded soil samples.
出处
《广东工业大学学报》
CAS
2013年第1期18-24,共7页
Journal of Guangdong University of Technology
基金
广东省教育厅科研基金资助项目(2008278)
