Authors

Abstract

Soil compaction caused by agricultural machinery operations is becoming increasingly serious, damaging soil structure and affecting sustainable agricultural production. However, there has been a lack of systematic research on the quantitative effects of straw on soil compaction. Therefore, this study used the discrete element method to investigate the effects of different straw contents (0–50%) on soil compaction characteristics. The results showed that: (1) When the loading plate sinks at a constant speed of 0.01 m/s, the compressive force on the soil mixture at depths of 50 mm, 100 mm, and 150 mm with 50% straw content is reduced by 669.03 N, 639.79 N, and 382.04 N, respectively, compared to pure soil; (2) When the loading plate was applied with a constant load of 100 N, the compressive forces at the same depths were reduced by 1,289.36 N, 862.9 N, and 607.49 N, respectively. Furthermore, both simulation results and indoor compaction experiments indicate that settlement decreases with increasing straw content. Pore ratio analysis confirms that the “micro-spring” effect of straw can improve soil compressive strength. This study provides guidance for enhancing agricultural machinery mobility and mitigating soil compaction hazards.

Abstract in Chinese

农业机械作业导致的土壤压实问题日益严重，破坏土壤结构并影响农业可持续生产，而当前对秸秆改良土壤压实的量化效应缺乏系统探究。因此本文采用离散元法研究了不同秸秆含量（0-50%）对土壤压实特性的影响。结果表明：（1）加载板以恒定速度0.01 m/s下沉，得到50%秸秆含量时50mm、100mm和150mm深度处的土壤混合体所受压缩力较纯土壤分别降低669.03N、639.79N和382.04N；（2）加载板以恒定载荷100N作用，得到相同深度处的压缩力分别降低1289.36N、862.9N、607.49N。其次，仿真结果与室内压实实验均表明沉陷量随秸秆含量的增加呈递减趋势，孔隙比分析验证了秸秆 “微弹簧”效应可改善土壤抗压性能。本研究对提升农业机械通过性能、减轻土壤压实危害具有指导意义。