基于冲击荷载法的碎石土路基力学特性及压实质量评价研究

doi:10.3724/1000-6915.jrme.2024.0641

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Abstract The impact loading method is a technique used to assess the compaction quality of subgrade by applying impact forces and analyzing the resulting response signals. Investigating the response mechanism of gravel soil subgrade under impact loading enhances our understanding of its mechanical properties and improves the evaluation principles of subgrade compaction quality using this method. The actual working conditions of gravel soil subgrade were fully considered, and a dynamic response model was established using the discrete element method. The model parameters were calibrated through triaxial tests, and its validity was verified by field experiments. Subsequently, the attenuation characteristics of dynamic stress in the subgrade under different compaction densities were explored and compared with results from continuum medium theory. A quantitative model relating porosity to the resilient modulus was further developed. The variations in surface response of the subgrade with changes in its properties were analyzed, and the effects of different impact load amplitudes and plate radii on the effective detection depth were discussed. The findings are as follows: (1) Porosity significantly affects the attenuation of internal dynamic stress in gravel soil subgrade, with faster attenuation observed at lower porosity levels; the dynamic stress obtained using continuum medium theory is generally lower, with a maximum difference exceeding 70%. (2) There is a strong linear relationship between porosity and resilient modulus of gravel soil subgrade, validating the feasibility of using the impact loading method to evaluate subgrade compaction quality. (3) The plate radius significantly impacts the effective detection depth of the impact loading method, with effective detection depths within 0.3 m for plate radii of 0.15 and 0.2 m, and between 0.3 and 0.4 m for a radius of 0.25 m.

Key words： subgrade engineering;gravel soil;;discrete element;impact load ompaction quality

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	Articles by authors
	LI Mengwei1
	2
	LU Zheng1
	TANG Chuxuan1
	2
	HU Zhi3
	CHAI Shaoqiang4
	LIU Yong4

Cite this article:

LI Mengwei1,2,LU Zheng1, et al. Study on mechanical properties and compaction quality evaluation of gravel soil subgrade based on impact load method[J]. , 2025, 44(6): 1649-1657.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0641 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1649

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