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Deformation and pore water pressure change during static and cyclic loading with subsequent shearing on soils with different textures and matric potentials
Soil and Tillage Research ( IF 6.5 ) Pub Date : 2021-01-05 , DOI: 10.1016/j.still.2020.104909
Xinjun Huang , Rainer Horn , Tusheng Ren

Soil deformation on arable lands due to heavy machine traffic always results in compaction and stress dependent shearing. The deteriorated effects of compaction on soil pore functions have been often reported, but less is known about the shearing-induced deformation. To better understand the combined effect of compaction and shearing on soil deformation and pore water pressure uw, measurements were performed on repacked soils with three textures (silt loam, sandy loam, and sand) and two matric potentials (-60 hPa and -300 hPa). Soils were sheared after two types of loading (static loading and cyclic loading) with three compaction levels (50, 100, and 200 kPa). Compaction was the main stress accounting for the loss of soil void ratio e and volume, on the contrary, shearing slightly increased void ratio and volume due to particle rotation in the shear zone. At -60 hPa, soil water ratio stepwisely decreased with compaction and subsequent shearing process. The soil volume change induced by compaction and shearing resulted in an obvious increase in uw. The higher the stress levels and initial matric potential, the more prominent changes in soil deformation and uw. Compared with static loading, further decrease of soil volume and increase of uw were observed under cyclic loading. Soils pre-compacted by cyclic loading always showed high and relatively constant uw values during shearing. The results demonstrated that compaction increased uw by decreasing e and increasing the degree of water saturation while shearing enhanced these effects by means of rearranging particles and blocking the water-filled pores. Therefore, after shearing, soil pore functions were further deteriorated compared with the initial state before compaction.



中文翻译:

在静态和循环载荷下的变形和孔隙水压力变化,以及随后在具有不同质地和基质势的土壤上的剪切

由于繁重的机器运输,耕地上的土壤变形始终会导致压实和与应力有关的剪切作用。压实对土壤孔隙功能的破坏作用经常被报道,但对剪切引起的变形知之甚少。为了更好地了解压实和剪切对土壤变形和孔隙水压力的综合影响üw在具有三种质地(粉质壤土,沙质壤土和沙子)和两种基质势(-60 hPa和-300 hPa)的重新装填的土壤上进行测量。两种载荷(静态载荷和循环载荷)在三种压实水平(50、100和200 kPa)后被剪切。压实是造成土壤孔隙率损失的主要应力Ë相反,由于剪切区内的颗粒旋转,剪切使空隙率和体积略有增加。在-60 hPa时,土壤水比随着压实和随后的剪切过程逐步降低。压实和剪切引起的土壤体积变化导致土体的明显增加。üw。应力水平和初始基体电位越高,土壤变形和变形的变化越明显。üw。与静载相比,土壤体积进一步减少,土壤养分增加。üw在循环载荷下观察到。通过循环荷载预压实的土壤总是表现出较高且相对恒定的状态üw剪切过程中的数值。结果表明压实度增加üw 通过减少 Ë并增加水饱和度,同时进行剪切,通过重新排列颗粒和堵塞充水孔来增强这些效果。因此,在剪切之后,与压实之前的初始状态相比,土壤孔隙功能进一步恶化。

更新日期:2021-01-05
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