摘要
为研究不同干密度下无污染重塑土和Cr6+污染重塑土在剪切过程中电阻率与抗剪强度关系,分别制取6种不同干密度的无污染重塑土和Cr6+污染重塑土试样,对其进行直剪试验,同时测量其电阻值,然后进行电阻率的换算与修正,并分析收集整理的数据。结果表明:较小频率可以反映土体结构变化,无污染重塑土较早达到抗剪强度值;Cr6+污染重塑土的强度随剪切位移而不断增加,Cr6+污染重塑土剪切过程电阻率的变化较无污染重塑土呈逐渐减小的趋势;Cr6+污染重塑土随干密度增加,剪应力增大,电阻率呈现先减小再增大,最后减小的走势;干密度在特定区间时,Cr6+污染重塑土的黏聚力小于无污染重塑土,其内摩擦角大于无污染重塑土的,而当干密度小于或者大于1.35~1.5区间时,黏聚力和内摩擦角的变化规律正好相反。
To investigate the relationship between the shear strength and electrical resistivity of remolded loess,six pure and Cr6＋contaminated remolded loess samples with different dry densities were prepared,respectively.The shear tests were conducted and the electrical resistivity was measured for these samples.The real electrical resistivity was subsequently modified in order to,fur-ther analyze and sort out.The results showed that the smaller current frequency reflected the changes of soil structure,and the pure remolded loess reached the shear strength earlier than Cr6＋ contaminated remolded loess.The shear strength of Cr6＋ con-taminated remolded loess increased slowly with increasing direct shear,accompanied by that the electrical resistivity of Cr6＋ con-taminated remolded loess decreased than that of pure remolded loess.As the dry density increased,the shear strength increased, and the electrical resistivity decreased at first and then increased finally decreased.When the dry density was between 1.35 and 1.5,the cohesion of C6＋r contaminated remolded loess was smaller than that of pure remolded loess,whereas the internal friction of C6＋r contaminated remolded loess was bigger than that of pure remolded loess.Such tendency was opposite if the dry density is out of this range.
出处
《中国科技论文》
CAS
北大核心
2015年第15期1778-1781,1788,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(51178287)
山西省回国留学人员科研资助项目(2013-043)
关键词
无污染重塑土
Cr6+污染重塑土
抗剪强度
电阻率
干密度
直剪试验
pure remolded loess
Cr6＋ contaminated remolded loess
shear strength
electrical resistivity
dry density
shear test
