珊瑚礁灰岩层基本性质及后压浆嵌岩桩竖向承载特性试验研究

doi:10.3724/1000-6915.jrme.2024.0650

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Abstract The development of reclaimed islands and reefs has emerged as an important strategic measure for coastal nations. This paper systematically investigates the mechanical properties and engineering characteristics of coral-reef limestone in the proposed area for Male-Airport Island cross-sea bridge project. Based on the results of static load tests and core drilling conducted on post-grouted rock-socketed drilled shafts，this study provides a comprehensive analysis of the bearing deformation characteristics of the shaft embedded in coral-reef limestone before and after grouting. Additionally，the integrity of the shaft and the permeation diffusion range of the grouting are thoroughly evaluated. The test results reveal that the coral-reef limestone exhibits notable characteristics，including low density，large pore sizes，unique structure，strength anisotropy，and uneven cementation. Furthermore，large-diameter post-grouted rock-socketed drilled shafts demonstrate promising application potential in the coral-reef limestone strata. The post-grouting technique enhances the bearing deformation capacity of shaft foundations in coral-reef limestone，with the ultimate bearing capacity of the test shaft increasing by 3.6% after grouting，and the displacement of the shaft head decreasing by 33.53% compared to before grouting. Core drilling tests indicate that the grouting at the shaft tip penetrates approximately 3 m(around 2D) downward，which significantly improves the pore structure of the coral-reef limestone. Finally，by correlating the unconfined compressive strength of intact coral-reef limestone with the ultimate side resistance and tip resistance，this paper develops a computational method for calculating the load capacity of grouted rock-socketed drilled shafts in coral-reef limestone formations. This methodology offers a robust scientific foundation and theoretical basis to guide subsequent engineering applications.

Key words： pile foundation coral-reef limestone post-grouted rock-socketed shaft engineering characteristics mechanical properties core drilling uniaxial compressive strength(UCS)

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	Articles by authors
	DUAN Chang1
	WAN Zhihui1
	DAI Guoliang2
	GUO Zilong1
	HU Tao2
	GONG Weiming2
	ZHANG Runze2

Cite this article:

DUAN Chang1,WAN Zhihui1,DAI Guoliang2, et al. Experimental study on the fundamental properties of coral-reef limestone and the vertical bearing behavior of post-grouted rock-socketed shafts[J]. , 2025, 44(3): 721-736.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0650 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I3/721

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