农业机械学报2017，Vol.48Issue(6)：59-65,7.DOI:10.6041/j.issn.1000-1298.2017.06.007
基于压实分析模型的土壤应力传递系数研究
Soil Stress Transmission Coefficient Based on Compaction Analytical Model
摘要
Abstract
Predicting soil stress with analytical models requires proper selection of the models' concentration factor.But due to the insufficient knowledge about the effects of soil conditions on stress transmission,little is known about how the concentration factor varies with soil states and loading conditions.The function of the concentration factor was transformed and a dimensionless factor σz/σ0 standing for soil-induced attenuation on the stress transmission was defined as the soil stress transmission coefficient and is denoted as STC.Since soil stress transmission property is affected by soil states and loading conditions,a modified oedometer testing setup with a soil stress sensor was used to evaluate controlled soil properties on STCs.Totally 30 soil states were tested by controlling soil water contents and bulk densities based on different soil styles.Correlation analysis was performed between measured STCs and soil state parameters,i.e.water content,bulk density and soil strength.The highly linear correlation between soil stress and applied surface stress indicated a stable STC for each particular soil state.STC was also found both linearly decreased with dry bulk density and precompression stress.The back-calculation of concentration factor from measured STCs illustrated that the proposed solution for soil stress transmission provided a means to define concentration factor for each soil state with measured result.Concentration factor varied from 1.20 to 12.39,being in agreement with the past reports.And the detail of how the concentration factor was affected by the changed states of soils was provided.关键词
土壤压实/分析模型/集中系数/土壤环境/应力传递系数Key words
soil compaction/analytical model/concentration factor/soil condition/stress transmission coefficient分类
农业科技引用本文复制引用
贺亭峰,丛文杰,BELAL Eisa Adam,丁启朔,杨艳山,霍连飞..基于压实分析模型的土壤应力传递系数研究[J].农业机械学报,2017,48(6):59-65,7.基金项目
国家自然科学基金项目(41371238) （41371238）
