• 研究报告 •

### 污泥改良沙化土壤水分入渗及再分布模拟

1. （沈阳建筑大学市政与环境工程学院， 沈阳 110168）
• 出版日期:2020-08-10 发布日期:2021-02-10

### Simulation on water infiltration and redistribution of sandy soil improved by sludge. #br#

HUANG Dian-nan*, ZHAO Chao-yue, ZHANG Yu-xin, LI Lin, JIAO Mei-yi, CHEN Ming-ming, HOU Wen-tao, FU Jin-xiang

1. (School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang 110168, China).
• Online:2020-08-10 Published:2021-02-10

Abstract:  The mixing of sludge and sandy soil is a way to improve desertified soil. Understanding the pattern of water infiltration and redistribution in the composite soil would facilitate project improvement. To ensure the applicability of simulation software in practical engineering, we analyzed the pattern of water infiltration and redistribution of a mixture of sludge and sand with a 1∶4proportion under simulated rainfall process. The experimental process was simulated by using Hydrus-1D soil moisture simulation software. The simulated data were compared with the measured data to verify the applicability of Hydrus-1D software in simulating sediment composite soil water infiltration to select a suitable model. The results showed that the Hydrus-1D software can predict water characteristic curve of composite soil. Basic soil property parameters were obtained, including residual water content (θr), saturated water content (θs), air intake value reciprocal (α), pore size distribution index (n), and hydraulic conductivity (KS). In the whole process of water infiltration simulation, water content of sand soil and composite soil graduallyincreased to a stable status close to but not equal to saturated water content. In the simulation test of water infiltration within 0-30 minutes, the difference between the measured curve and the simulated curve was not significant. After 60 minutes, the difference between the measured curve and the simulated curve in the simulation test of water redistribution in each soil layer was large. These results indicate that the software can simulate water infiltration, but not water redistribution.