不同含盐量条件下硫酸盐渍土蠕变特性与微观孔隙变化  

Creep Characteristics and Micro-Pore Structural Changes of Saline Sulfate Soil under Different Salt Contents

作　　者：田思宇 李晓 张卫兵[1,2] 刘臻祥 TIAN Siyu;LI Xiao;ZHANG Weibing;LIU Zhenxiang(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Engineering Research Center Funded by Ministry of Education for Effective Utilization of Water Resources in Modern Agriculture in Arid Areas,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]旱区现代农业水资源高效利用教育部工程研究中心,宁夏银川750021

出　　处：《宁夏工程技术》2024年第2期160-167,共8页Ningxia Engineering Technology

基　　金：宁夏自然科学基金项目(2021AAC03067);宁夏高等学校一流学科建设项目(NXYLXK2021A03);自治区级大学生创新创业训练计划项目(S202210749102)。

摘　　要：为了探究不同含盐量条件下硫酸盐渍土的蠕变特性以及微观孔隙变化规律,采用自制一维蠕变仪对宁夏红寺堡地区的硫酸盐渍土进行蠕变试验,并对试验后的土样进行扫描电镜试验。结果表明:经历一维蠕变后,土体最终蠕变量随含盐量的增大而增大,随温度的降低而减小,蠕变速率随时间的增长而减小,且随含盐量的增大、温度的升高,土体经历衰减蠕变的时间越长,进入稳定蠕变的时间越晚;一维蠕变后,随含盐量的增加,大孔隙和中孔隙的数量减小,小孔隙和微孔隙的数量增加,孔隙形状以近椭圆形为主,复杂度增加,孔隙形状趋于复杂化,孔隙分形维数增大。In order to explore the creep characteristics and micro-pore structural changes of sulfate saline soil under different salt content conditions,a series of creep tests were conducted on sulfate saline soil samples from the Hongsipu area in Ningxia using a custom-made one-dimensional creep apparatus,and post-experiment soil samples were examined with a scanning electron microscope.The results indicated that after one-dimensional creep,the final creep content of the soil increased with the increase of salt content,and decreased with the decrease of temperature.The creep rate decreased over time.Moreover,with the increase in salt content and temperature,the soil experienced a longer decay creep phase before reaching a steady creep state.After one-dimensional creep,an increase in salt content led to a reduction in the number of large and medium pores and an increase in small and micro pores.The pores were predominantly elliptical in shape,exhibiting increased complexity and a tendency toward more complicated structures.Furthermore,the fractal dimension of the pores increased.

关 键 词：硫酸盐渍土 一维蠕变 扫描电镜试验 微观结构 

分 类 号：TU448[建筑科学—岩土工程]