土体含水率对振动压实的影响及电阻率演化特征研究

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振动与冲击 ›› 2025, Vol. 44 ›› Issue (7) : 16-25.

振动理论与交叉研究

土体含水率对振动压实的影响及电阻率演化特征研究

李佳文1，陈高明1，田世龙1，韩博文2，冯怀平*1，杨志浩1

作者信息 +

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

Author information +

文章历史 +

摘要

土体含水率对路基振动压实的影响不可忽略，电阻率法被认为是实现含水率连续测试的有效手段。为研究不同含水率土体在振动压实过程中的变形特征及电阻率演化规律，基于非饱和土的BBM模型，结合非饱和渗流的Richards方程和表征土体电阻率的Archie推广公式，建立了考虑土体振动压实的水-力-电多场耦合数值计算模型，并通过室内试验验证了模型的准确性。而后利用数值模型分别对四组不同含水率的土体在振动压实过程中的变形、回弹模量和电阻率演化规律进行了数值计算研究。结果表明：振动压实过程中，土体含水率对于土体的变形影响显著，土体沉降最终会趋于平衡状态，含水率越低，土体达到平衡状态越快。大于最佳含水率的土体，其最终的沉降和塑性变形幅值趋于一致。土体回弹模量在振动压实过程中随着逐渐压密而相应增大，强振作用下回弹模量的增长尤为突出。振动荷载作用下电阻率的演化特征研究表明，虽然振动荷载会造成土体电阻率的周期性波动，但最终达到稳定后这种波动很小，并不会影响土体电阻率反映振动压实过程中的变形状态。通过试验和数值计算相结合的方法，对土体电阻率法测含水率进行了深入研究，验证了电阻率实时反映土体压实状态的理论与应用的合理性，可为考虑含水率的土体连续振动压实研究提供参考。

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.

导出引用

李佳文1, 陈高明1, 田世龙1, 韩博文2, 冯怀平1, 杨志浩1. 土体含水率对振动压实的影响及电阻率演化特征研究[J]. 振动与冲击, 2025, 44(7): 16-25

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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