Soil stress analysis at different depths after agricultural vehicle operation

The stepwise compression experiment of soil samples was carried out by WG single lever consolidation instrument (medium and low pressure) and NSIF geotechnical test control data acquisition and processing system, and the compression curve of the pore ratio and external load of the sample soil under the side limit condition and the change of soil stress measured at different depths of the soil were obtained: with the increase of external load, the pore ratio of soil gradually decreased, and the compressive modulus gradually increased. The larger the soil pore ratio, the smaller the allowable bearing capacity of the soil, and when the soil pore ratio is reduced to a certain extent, the stress strain change of the test soil tends to be stable.

采用WG单杠杆固结仪（中低压）与NSIF岩土试验控制数据采集处理系统开展土样逐级压缩试验，获取了侧限条件下试样土体的孔隙比-外荷载压缩曲线，以及土层不同深度处测得的土体应力变化规律：随着外荷载增大，土体孔隙比逐渐降低，压缩模量逐步提升；土体孔隙比越大，其容许承载力越低；当土体孔隙比降低至一定程度后，试验土体的应力应变变化趋于稳定。