Predicting unsaturated soil strength of coarse-grained soils for mobility assessments

IF 2.4 3区 工程技术 Q3 ENGINEERING, ENVIRONMENTAL
Matthew D. Bullock, Joseph Scalia IV, Jeffrey D. Niemann
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引用次数: 0

Abstract

Accurately estimating surficial soil moisture and strength is integral to determining vehicle mobility and is especially important over large spatial extents at fine resolutions. While methods exist to estimate soil strength across landscapes, they are empirical and rely on class average soil behavior. The Strength of Surficial Soils (STRESS) model was developed to estimate moisture-variable soil strength with a physics-based approach. However, there is a lack of field data from a diverse landscape to evaluate the STRESS model. To test the STRESS model, a field study was conducted in northern Colorado. Soil moisture and strength were measured on 10 dates. Data from the surficial layer (0–5 cm) were used to test the STRESS model and determine if soil strength trends could be estimated from topographical and soil textural differences. High variability was observed in soil strength measurements stemming from fine-scale terrain features and user variability. Observations show lower soil strengths for greater soil moistures, steeper slopes, higher vegetation, and lower soil fines content. STRESS estimated rating cone index values with a mean relative error of 37.5 %, while a pre-existing model had a mean relative error of 47.4 %. The STRESS model outperforms the current RCI prediction method, but uncertainty remains large.

为流动性评估预测粗粒土的非饱和土壤强度
准确估算表层土壤湿度和强度对于确定车辆的机动性不可或缺,尤其是在精细分辨率的大空间范围内。虽然有一些方法可以估算整个地貌的土壤强度,但这些方法都是经验性的,依赖于土壤的类平均行为。表层土壤强度(STRESS)模型是基于物理方法开发的,用于估算随湿度变化的土壤强度。然而,目前缺乏来自不同地貌的实地数据来评估 STRESS 模型。为了测试 STRESS 模型,我们在科罗拉多州北部进行了实地研究。在 10 个日期测量了土壤水分和强度。来自表层(0-5 厘米)的数据被用来测试 STRESS 模型,并确定是否可以根据地形和土壤质地差异估算出土壤强度趋势。在土壤强度测量中发现,由于地形特征和使用者的差异,土壤强度测量结果存在很大差异。观测结果表明,土壤湿度越大、坡度越陡、植被越多、土壤细粒含量越低,土壤强度就越低。STRESS 估算的评级锥指数值的平均相对误差为 37.5%,而之前已有模型的平均相对误差为 47.4%。STRESS 模型优于当前的 RCI 预测方法,但不确定性仍然很大。
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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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