Effects of soil moisture content on vibration compaction and evolution characteristics of electrical resistivity

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (7) : 16-25.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Effects of soil moisture content on vibration compaction and evolution characteristics of electrical resistivity

LI Jiawen1, CHEN Gaoming1, TIAN Shilong1, HAN Bowen2, FENG Huaiping*1, YANG Zhihao1

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Abstract

Effects of soil body moisture content on subgrade vibration compaction can’t be ignored, and the electrical resistivity method is considered as an effective means to realize continuous measuring of moisture content. Here, to study deformation characteristics of soil bodies with different moisture contents in vibration compaction process and electrical resistivity evolution law, based on BBM model of unsaturated soil, combined with Richards equation of unsaturated seepage and Archie extended formula to characterize soil body electrical resistivity, a water-force-electricity multi-field coupling numerical calculation model considering soil vibration compaction was established. The correctness of the model was verified with laboratory tests. Then, the numerical model was used to study deformation, resilience modulus and electrical resistivity evolution law of soil bodies with 4 sets of different moisture contents in vibration compaction process. The results showed that in vibration compaction process, soil body moisture content has a significant impact on soil body deformation and soil body settlement can eventually tend to equilibrium state, the lower the moisture content, the faster the soil body reaches its equilibrium state; final settlement and plastic deformation amplitude of soil body with a moisture content larger than the optimal moisture content tend to be consistent; resilience modulus of soil body increases gradually with compaction in vibration compaction process, and increase in resilience modulus is particularly prominent under strong vibration. The study on evolution characteristics of electricity resistivity under vibration load showed that although vibration load can cause periodic fluctuation of soil body electricity resistivity, this fluctuation is very small after reaching stability and can’t affect soil body resistivity to reflect deformation state in vibration compaction process. Through combination of tests and numerical calculations, the soil body electricity resistivity method used to measure moisture content was deeply studied to verify the theoretical and application rationality of its real-time reflecting soil compaction status, and provide a reference for studying continuous vibration compaction of soil body considering moisture content.

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subgrade soil / vibration compaction / moisture content / evolution law of electrical resistivity / water-force-electricity multi-field coupling

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LI Jiawen1, CHEN Gaoming1, TIAN Shilong1, HAN Bowen2, FENG Huaiping1, YANG Zhihao1. Effects of soil moisture content on vibration compaction and evolution characteristics of electrical resistivity[J]. Journal of Vibration and Shock, 2025, 44(7): 16-25

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