Experimental investigation of factors affecting the characterisation of soil strength properties using a Bevameter in-situ plate sinkage and shear test apparatus

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Ray Kruger, P. Schalk Els, Herman A. Hamersma
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Abstract

The Bekker-Wong soil-wheel interaction model has been widely adopted in the terramechanics field. This model requires the soil to be characterised using a Bevameter, which entails performing in situ plate sinkage and shear stress tests. Bevameter soil characterisation is not a standardised test procedure, and the test setup may influence the identified soil model parameters. This study investigates the influence of the following five factors for partially saturated sandy soil: I) soil preparation method on pressure-sinkage, II) soil preparation method on shear stress, III) torsional vs. translational shear mechanism, IV) shear contact area, and V) the influence of shear velocity. The results indicate that the influence of soil preparation on pressure-sinkage response is substantial, exhibiting an order-of-magnitude difference. The influence of soil preparation on shear tests is notable, but less significant. The shear mechanism, shear contact area and shear velocity exhibited a maximum absolute shear stress difference of 18%, 20% and 10%, respectively. Moreover, depending on the test setup configuration and data processing decisions, the estimated internal soil friction angles ranged from 16.5 to 37.5° for the same soil. The findings are expected to have significant implications for the prediction of vehicle drawbar pull using the Bekker-Wong model.

利用Bevameter原位板沉降剪切试验装置对土强度特性表征影响因素进行试验研究
Bekker-Wong土-轮相互作用模型在地球力学领域被广泛采用。该模型要求使用Bevameter对土壤进行表征,这需要进行原位板下沉和剪切应力测试。Bevameter土壤表征不是一个标准化的测试程序,测试设置可能会影响识别的土壤模型参数。研究了部分饱和砂土的5个影响因素:1)整土方法对压力沉降的影响;2)整土方法对剪应力的影响;3)扭剪与平剪机制;4)剪切接触面积;5)剪切速度的影响。结果表明,整土对压力沉降响应的影响是显著的,表现出数量级的差异。制备土对剪切试验的影响显著,但不显著。剪切机制、剪切接触面积和剪切速度的最大绝对剪应力差异分别为18%、20%和10%。此外,根据试验装置配置和数据处理决策,对相同土壤的估计内摩擦角范围为16.5至37.5°。研究结果预计将对使用Bekker-Wong模型预测车辆拉杆拉力具有重要意义。
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来源期刊
Journal of Terramechanics
Journal of Terramechanics 工程技术-工程:环境
CiteScore
5.90
自引率
8.30%
发文量
33
审稿时长
15.3 weeks
期刊介绍: The Journal of Terramechanics is primarily devoted to scientific articles concerned with research, design, and equipment utilization in the field of terramechanics. The Journal of Terramechanics is the leading international journal serving the multidisciplinary global off-road vehicle and soil working machinery industries, and related user community, governmental agencies and universities. The Journal of Terramechanics provides a forum for those involved in research, development, design, innovation, testing, application and utilization of off-road vehicles and soil working machinery, and their sub-systems and components. The Journal presents a cross-section of technical papers, reviews, comments and discussions, and serves as a medium for recording recent progress in the field.
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