岩土工程学报2025，Vol.47Issue(1)：106-114,9.DOI:10.11779/CJGE20230989
黄原胶生物聚合物改良膨胀土裂隙演化规律研究
Development of cracks in expansive soil improved by xanthan gum biopolymer
摘要
Abstract
The use of xanthan gum biopolymer,which can suppress the expansion of cracks of in expansive soil without affecting the growth of slope vegetation,is a new approach for ecological protection of expansive soil slopes.The indoor wet dry cycle tests are conducted on the xanthan gum-modified expansive soil,and the digital image processing technology is used to quantitatively analyze the entire process of crack development.The influences of xanthan gum content on the characteristic indices of crack morphology in expansive soil are explored,and the changes in microstructure and mineral composition of expansive soil before and after improvement are analyzed through the scanning electron microscopy and X-ray diffraction experiments,The improvement mechanism of xanthan gum on expansive soil is explored based on the results of the expansion rate tests.The research results indicate that the addition of xanthan gum can effectively improve the water retention and crack resistance of expansive soil,and the average water loss rate and crack rate of the sample decrease with the increase of dosage.The Xanthan gum can reduce the impact of wetting-drying cycle on expansive soil,control the crack width within a small range,and make it easy to close during the humidification process.It mainly inhibits the cracking of expansive soil through two aspects.On the one hand,it forms a"bridging"structure with soil particles through bonding and cementation,enhancing the overall tensile strength of the soil.On the other hand,by filling and film-forming,it blocks the contact between water and soil particles,reducing the thickness of the hydration film of clay minerals.关键词
道路工程/黄原胶生物聚合物/干湿循环/裂隙/微观结构Key words
road engineering/xanthan gum biopolymer/wetting-drying cycle/crack/microstructure分类
建筑与水利引用本文复制引用
欧阳淼,张红日,邓人睿,王桂尧,肖杰,赵亚..黄原胶生物聚合物改良膨胀土裂隙演化规律研究[J].岩土工程学报,2025,47(1):106-114,9.基金项目
国家自然科学基金重点项目(42330701) （42330701）
广西重点研发计划项目(桂科AB23075184) （桂科AB23075184）
国家重点研发计划项目(2019YFC1509800) （2019YFC1509800）
国家自然科学基金项目(42477143,52178416) （42477143,52178416）
湖南省研究生科研创新项目(QL20220195) （QL20220195）
