中卫地区粉砂土湿陷特性及影响因素探讨

Analysis of the collapsibility characteristics and its affecting factors of silt sand in Zhongwei districts

结合电力工程实践,通过室内试验数据统计分析,对中卫地区粉砂土的湿陷特性及影响因素进行了探讨,并与该地区大厚度自重湿陷性黄土进行了对比分析。结果表明:不同于该地区典型湿陷性黄土,粉砂土湿陷系数与孔隙比和干密度并无明显的相关性;粉砂土湿陷系数与含水量呈现出良好的非线性负相关性;当粉粒和粉砂含量相对均匀时,粉砂土会表现出更强的非自重湿陷性;当粉砂土颗粒成分以粗粒(或细粒)为主时,湿陷性随细粒(或粗粒)含量增多而增强。

Based on statistical analysis of lab experiments and electrical engineering practice, the paper analyzed the collapsibility characteristics and its affecting factors of silt sand in Zhongwei district and compared it with collapse loess with large thickness. The analysis results showed that the silt sand was different with the typical collapse loess, its coefficient of collapsibility had no clear correlation with void ratio or dry density, but it had good negative linear relationship with moisture content. And the silt sand would show more serious non-gravity collapsibility when the content of aleurite and silt particle were relatively homogeneous. Additionally, when the grin size is dominated by coarse particle（or fine particle）, the collapsibility of silt sand increased with the increase of fine particle（or coarse particle）content.