人民长江2024，Vol.55Issue(7)：221-228,8.DOI:10.16232/j.cnki.1001-4179.2024.07.029
细粗粒覆盖层对膨胀土边坡防渗效果数值研究
Numerical study on anti-seepage effect of expansive soil slope treated by fine coarse grain cover layers
摘要
Abstract
This study investigates the anti-seepage effect of a capillary barrier consisting of a layer of fine-grained soil under-lying and a layer of coarse-grained soil on expansive soil slopes through the numerical model.The moisture stress in expansive soil is applied to the soil in the form of a temperature stress field using the initial strain method,and the numerical simulation of hygroscopic expansion of expansive soil slope is realized by numerical software.The criterion for determining slope stability is whether the equivalent plastic strain zone is completely penetrated or not.The numerical simulation results indicate that the capil-lary barrier cover layer forming a strong permeable layer can effectively prevent rainfall infiltration and achieve a good slope pro-tection effect.Under the selected operating conditions in this article,the slope protection effect of the capillary barrier cover layer composed of 0.5 m fine-grained soil layer and 0.2 m coarse-grained soil layer is equivalent to that of 1.5 m cement modified soil.The capillary blocking ecological slope protection structure has a good slope protection effect on expansive soil slopes.The re-search results can provide a theoretical and designed basis for related expansive soil slope protection.关键词
粗粒土覆盖层/膨胀土边坡/毛细阻滞护坡结构/吸湿膨胀/数值模拟/防渗效果Key words
coarse grain cover layer/expansive soil slope/capillary barrier cover layers/hygroscopic expansion/numerical simulation/anti-seepage effect分类
建筑与水利引用本文复制引用
权全,邱金伟,胡波,李涛,刘明华,宋诚,吴昊..细粗粒覆盖层对膨胀土边坡防渗效果数值研究[J].人民长江,2024,55(7):221-228,8.基金项目
安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20230118528,YJJH-ZT-ZX-20191031216) （YJJH-ZT-ZX-20230118528,YJJH-ZT-ZX-20191031216）
国家自然科学基金青年基金项目(52208329) （52208329）
