Experimental studies of stresses in soil affected by a vibratory roller

Abstract

Stresses in soil are a link between all parameters and operation modes of a vibratory roller and deformations at different depths of the soil. The paper presents a research technology and the results of measuring stress amplitudes in soil at depths of 0.15, 0.3, and 0.5 m at different dynamic moduli of soil deformation Evd. It is established that in the surface layer (0.15 m deep) within a single loading cycle, the duration of stress buildup phase is 1.5…2 times lower than the duration of stress relief phase, and this ratio increases with compaction. Within one roller pass in the surface layer (0.15 m deep), the increase period of the amplitudes of separate stress cycles is 1.2…2 times longer than the decrease period of those, and this ratio also increases with compaction. It is established that the vibration impact of a roller, similarly to the impact loading of soil with a tamper, affects how the stresses change during the relief phase at each impact cycle. This change is the same as how the stresses change during the relief phase in a surface layer (0.15 m deep), which confirms that it is possible to apply the provisions of the dynamic theory of plasticity not only for impact, but also vibratory and vibro-impact soil compaction modes. The obtained results can be used to update and verify the existing and future mathematical models of soil compaction with vibratory rollers.

Simulation of Vibratory Plate Interaction With the Ground Surface

“…2). В табл 2. применяются следующие единицы измерения параметров: t 1 , мс; Неравенство значений времени нагружения грунта t 1 , времени разгрузки грунта t 2 (t 1 < t 2 ) прослеживается и в результатах экспериментальных исследований уплотнения грунта виброплитами, выполнявшимися на кафедре «Строительные и дорожные машины» ЯГТУ в 2015 г. Аналогичная ситуация (t 1 < t 2 ) наблюдается и при уплотнении грунта вибрационными катками [33] и трамбующими машинами [34].…”