期刊论文

Effect of acid environment on swelling-shrinkage properties of Baise expansive soil and its microscopic interpretation

中文

交通运输工程学报

1671-1637

2019

19

1

24-32

10.19818/j.cnki.1671-1637.2019.01.004

51608053:国家自然科学基金 2017JJ3335:湖南省自然科学基金 CX2017B458:湖南省研究生科研创新项目

本校为第一机构

以广西酸雨重灾区百色膨胀土为研究对象, 模拟不同酸性条件 (pH值分别为3、5、7) 开展无荷膨胀率、膨胀力与线缩率试验, 研究酸雨对其胀缩性能的影响, 并采用扫描电镜 (SEM) 图像和X射线衍射 (XRD) 图谱分析了其微观结构与矿物成分, 运用IPP图像处理软件定量分析了SEM图像中试样的微结构.研究结果表明:试样起始含水率降低时, 酸性环境对其膨胀变形的促进作用加大;起始含水率由17％降至9％时, 不同酸性环境下试样的无荷膨胀率之差变大, 相比中性溶液, pH值为3和5的酸性溶液浸泡试样的无荷膨胀率增幅分别由20.6％和5.6％增至26.9％和7.0％;随着溶液pH值的减小, 试样无荷膨胀率、膨胀力与线缩率均呈...

The Baise expansive soil in heavy acid rain area of Guangxi was selected as the study subject. To explore the effect of acid rain on the swelling-shrinkage properties of Baise expansive soil, the load-free swelling rate test, swelling force test and linear shrinkage rate test were carried out under different acid conditions (pH values are 3, 5 and 7, respectively). The changes in the microstructure and mineral composition of expansive soil were analyzed through the scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns, ...