【摘要】 为探究降雨作用下改性糯米基重构土层持水机理及入渗规律，首先开展了土柱入渗试验，通过改变改性糯米基材料的掺入量，分析其对重构土体垂直方向宏观渗透规律的影响，并采用核磁共振与电镜扫描技术，探究不同材料掺量下重构土微观孔隙结构特征与持水特性，在此基础上选取持水性能最优重构土(12.5%掺量)开展降雨边坡模型试验，探明重构土层水分运移规律及降雨后水分再分布特征。结果表明：随着改性糯米基材料掺量增加，有效孔(中孔)数量先增加后减少，小孔数量逐渐增加，大孔数量逐渐减少，且在掺量为12.5%时，土体持水能力最佳。改性糯米基材料通过包裹、吸附与土颗粒、砾石结合形成团聚体，从而改变土体孔隙结构，增强土体持水性，提高土体水分有效性。在25 mm/h雨强条件下，边坡坡度增大导致各截面入渗深度减小，入渗部位由坡顶向坡脚迁移，整个降雨期间边坡入渗深度随坡度增大而降低，降雨结束后坡内水分重新分布，35°、55°与75°边坡平均入渗深度分别为10、8、5 cm。该研究对完善边坡生态修复技术体系，指导生态修复边坡养护管理具有重要意义。更多还原

【Abstract】 In order to investigate the water-holding mechanism and infiltration law of modified glutinous rice-based reconstructed soil layer under rainfall, soil column infiltration tests were firstly conducted to analyze the influence of modified glutinous rice-based material dosage variations on macroscopic vertical infiltration patterns of reconstructed soil. NMR(nuclear magnetic resonance) and scanning electron microscopy technologies were employed to investigate microporous structure and water-holding characteristics under different material dosages. Based on the findings, reconstructed soil with optimal material dosage(12.5%) was selected for rainfall slope modeling tests, through which moisture transport patterns and post-precipitation water redistribution characteristics in reconstructed soil layers were investigated.The results show as follows. With the increase of the dosage of modified glutinous rice-based materials, the number of effective pores(mesopores) increases and then decreases, the number of small pores gradually increases and the number of large pores gradually decreases, and the soil water-holding capacity is optimal when the dosage is 12.5%. increases and the number of large pores gradually decreases, and the soil water-holding capacity is optimal when the dosage is 12.5%. Modified glutinous rice-based materials wrap around, adsorb to soil particles, and combine with gravel to form agglomerates, thereby changing the pore structure of the soil, enhancing the soil water retention capacity, and improving the effectiveness of soil water. Under the condition of 25 mm/h rainfall intensity, an increase in slope gradient led to the decrease of infiltration depth of each cross-section, and the infiltration site shifted significantly(from the top to the foot of the slope). The depth of slope infiltration during the entire rainfall period decreased significantly with the increase of slope gradient, and water in the slope was redistributed at the end of rainfall. The average infiltration depth of the slope at 35°, 55°, and 75° was 10 cm, 8 cm, and 5 cm, respectively. This study is significant for improving the technical system of ecological slope restoration and guiding conservation and management efforts.更多还原