Authors

Abstract

The lateral stress on the soil in the lateral position during the operation of a subsoiler directly affects the soil displacement and quality of operation. In this study, soil pressure sensors are used to measure the soil lateral stress at the lateral position of the subsoiler in the soil trough, and a discrete element simulation is used to explore the relationship between the change pattern of the soil lateral stress and soil displacement. The test results show that the soil at the lateral position of the subsoiler is subjected to lateral stress, which leads to the generation of lateral displacements. The lateral stress lasts no longer than 3.5 s, the lateral displacement lasts no longer than 3 s, and both exhibit a fluctuating pattern of peaks and troughs over time. The positive peaks are significantly larger than the troughs, indicating that the positive peaks are the main factor generating soil disturbance. The lateral stress and lateral displacement changes are consistent on the timeline, with the lateral displacement moving in the positive (negative) direction when the lateral stress direction is positive (negative). Both values tend to decrease linearly with increasing transmission distance.

Abstract in Chinese

松土机作业过程中土壤侧向应力直接影响土壤位移及作业质量。本研究通过土槽试验，利用土压力传感器测量松土机侧向位置土壤所受侧向应力，并结合离散元仿真探究土壤侧向应力变化规律与土壤位移的关联性。试验结果表明：松土机侧向位置土壤受侧向应力作用产生侧向位移，侧向应力作用时长不超过3.5 s，侧向位移持续时长不超过3 s，二者均呈现“波峰-波谷”交替的波动规律，且正向波峰幅值显著高于波谷，表明正向应力峰是引发土壤扰动的主要因素；侧向应力与侧向位移在时序上具有一致性，侧向应力方向为正（负）时，侧向位移沿正（负）方向运动；二者均随传递距离增大呈线性衰减趋势。研究结果为优化松土机结构参数与作业模式提供了理论依据。