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Influence of loading and loading-free processes of cyclic torsional shear to soil compaction

机译：循环扭剪的有载和无载过程对土壤压实的影响

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摘要

The loading and loading-free processes of a cyclic torsional shear test were conducted to investigate and simulate the soil behavior induced by machinery services in the field during crop production. The results showed that the corresponding torsional shear deformation was found under the cyclic loading process accompanied by the development of pore water pressure. On the other hand, an increase of hulk density and axial strain occurred on the loading-free process and seemed to be affected by the development of pore water pressure in the preceding cyclic loading process. A comparison with the normal cyclic torsional shear loading test was also made in order to distinguish the specific soil behavior under both loading modes. Moreover, the effects of loading magnitude, amount of the number of cyclic loading in the loading set and bulk density were clarified. Also, the stress path tracing in the state space was investigated to help explain the soil behavior under loading and loading-free processes.
机译：进行了循环扭剪试验的有载和无载过程，以研究和模拟田间机械服务在农作物生产过程中引起的土壤行为。结果表明，在循环荷载作用下，伴随孔隙水压力的升高，出现了相应的扭转剪切变形。另一方面，在无负荷过程中发生了绿泥密度和轴向应变的增加，并且似乎受先前循环负荷过程中孔隙水压力的发展的影响。还与正常的循环扭剪试验进行了比较，以区分两种载荷模式下的特定土壤特性。此外，阐明了载荷大小，载荷集中的循环载荷数量和堆积密度的影响。此外，研究了状态空间中的应力路径追踪，以帮助解释在有载和无载过程中的土壤行为。

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