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.
HE Tingfeng,CONG Wenjie,BELAL Eisa Adam,DING Qishuo,YANG Yanshan,HUO Lianfei.Soil Stress Transmission Coefficient Based on Compaction Analytical Model[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(6):59-65.
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基于压实分析模型的土壤应力传递系数研究   [下载全文]
Soil Stress Transmission Coefficient Based on Compaction Analytical Model   [Download Pdf][in English]
投稿时间:2016-10-23  
DOI:10.6041/j.issn.1000-1298.2017.06.007
中文关键词:  土壤压实  分析模型  集中系数  土壤环境  应力传递系数
基金项目:国家自然科学基金项目(41371238)
作者单位
贺亭峰 南京农业大学工学院 
丛文杰 南京农业大学工学院 
BELAL Eisa Adam 南京农业大学工学院
扎林盖大学农业工程系 
丁启朔 南京农业大学工学院 
杨艳山 南京农业大学工学院 
霍连飞 南京农业大学工学院 
中文摘要:机械压实是造成土壤退化的重要原因之一,研究并预测土壤应力有助于科学规划田间机械使用,缓解压实问题。基于分析模型预测土壤应力的关键在于选择合适的集中系数。然而在已有的研究中集中系数取值混乱,导致该模型使用时存在很大争议,其原因在于对该参数随土壤环境的变化缺乏规律性认识。本文通过对集中系数表达式的进一步推导,在理论上提出了能够代表土壤环境对集中系数影响的无量纲参数σz/σ0,定义为应力传递系数(STC)。基于水稻土和黄棕壤两种土壤,通过控制含水率和湿密度于室内重塑30种状态的土壤,在单轴压缩实验中运用土压力传感器测量计算应力传递系数,建立应力传递系数与土壤环境参数,如含水率、干密度和先期固结压力等之间的相关性分析。结果表明应力传递系数随土壤含水率的增大而增大,土壤初始干密度和先期固结压力与应力传递系数之间负相关性明显。根据所得应力传递系数计算相应土壤状态下的集中系数,其取值在1.20~12.39之间,与以往的研究结果相差不大,但包含了关于集中系数随土壤环境变化的具体信息。这意味着作为一个稳定可测的无量纲参数,应力传递系数为集中系数的计算提供了一个相对科学的方法,在定量描述土壤环境对集中系数影响的同时,完善了分析模型。
HE Tingfeng  CONG Wenjie  BELAL Eisa Adam  DING Qishuo  YANG Yanshan  HUO Lianfei
College of Engineering, Nanjing Agricultural University,College of Engineering, Nanjing Agricultural University,College of Engineering, Nanjing Agricultural University;Department of Agricultural Engineering, Zalingei University,College of Engineering, Nanjing Agricultural University,College of Engineering, Nanjing Agricultural University and College of Engineering, Nanjing Agricultural University
Key Words:soil compaction  analytical model  concentration factor  soil condition  stress transmission coefficient
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.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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