透水性基床级配碎石填料宏细观压实特性试验研究

doi:10.13722/j.cnki.jrme.2021.0912

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Abstract Unbound permeable aggregate base(UPAB) materials are increasingly used in foundation layers of porous or permeable pavements due to their desired drainage performance. The compaction quality of such layers directly affects critical in-service performance including post-construction settlement and durability. This paper conducted both conventional impact and newly-developed vibratory plate compaction tests on such UPAB materials Seven different UPAB gradations were designed by using the gravel-to-sand ratio(G/S) concept to represent different types of packing structures. The effects of gradation，compaction method and corresponding energy level on macroscopic compaction characteristics and particle breakage were studied. The optimal combination of vibratory parameters was identified. The normalized curves of achieved dry density versus degree of saturation were proposed and verified preliminarily. Such normalized curves are insensitive to variations in gradation，compaction method and energy level for similar aggregate types. The high-precision X-ray CT(XCT) scanning technology was employed to comparatively study meso-scale characteristics of particle movement，internal pore structure and connectivity of UPAB specimens with different gradations and vibratory parameters. It was found that the G/S concept-based gradation design method can effectively differentiate UPAB packing structures. There appeared to exist an optimal G/S range in terms of desired achieved dry density，particle breakage，and pore structure. The achieved dry density versus time curves of UPAB specimens obtained from vibratory compaction tests exhibited three distinct stages. The optimal vibratory frequency was found to range from 25 to 27 Hz，whereas there existed the most effective combination of vibratory force and duration time that yields the greatest dry density. The XCT results further substantiated macro-scale compaction characteristics. The curves of normalized achieved dry density versus degree of saturation could be useful for improved evaluation and control of field compaction quality of such UPAB layers in engineering practice.

Key words： soil mechanics unbound permeable aggregate base materials vibratory plate compaction degree of saturation particle breakage particle movement pore structure

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	Articles by authors
	WANG Meng1
	YU Qunding1
	2
	XIAO Yuanjie1
	3
	LI Wenqi1
	HUA Wenjun1
	WANG Xiaoming1
	CHEN Xiaobin1
	3

Cite this article:

WANG Meng1,YU Qunding1,2, et al. Experimental investigation of macro-and meso-scale compaction characteristics of unbound permeable base materials[J]. , 2022, 41(8): 1701-1716.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0912 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1701

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