武汉原状粉质黏土与其重塑土的试验对比研究(Ⅰ):试验结果描述  

A Contrastive Study of Natural and Remoulded Silty Clays in Wuhan(Ⅰ): Description of Experimental Results

作　　者：杨雪强[1] 刘文治[2] 刘祖德[3] 何世秀[4] 陈善雄[5] 

机构地区：[1]广东工业大学土木与交通工程学院,广东广州510006 [2]云南农业大学建筑工程学院,云南昆明650204 [3]武汉大学土木建筑工程学院,湖北武汉430074 [4]湖北工业大学土木工程与建筑学院,湖北武汉430068 [5]中国科学院武汉岩土力学研究所,湖北武汉430074

出　　处：《广东工业大学学报》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)

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.

关 键 词：原状粉质黏土 重塑粉质黏土 k固结试验 三轴试验 剪胀 

分 类 号：TU411[建筑科学—岩土工程]