浸水作用下灰岩缝合线剪切强度劣化机制及等效模拟方法

doi:10.3724/1000-6915.jrme.2024.0933

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Abstract Limestone is relatively dense and has low permeability. Its internal structural weak planes act as conduits for water within the rock mass, potentially leading to engineering instability and failure. To examine the degradation characteristics and mechanisms of the shear mechanical properties of limestone stylolite under immersion, the stylolite was categorized based on field investigations, and specimens were prepared for testing. The findings showed that stylolite with a width of b < 1 mm exhibited similar characteristics to limestone. The impact of immersion was primarily evident in the reduction of cohesion, though this decline was not substantial (approximately 11.0%). Stylolite with 1 mm ≤ b ≤ 5 mm and b > 5 mm predominantly demonstrated a decline in the internal friction angle after immersion. The reduction rates reached 21.2% and 30.9%, respectively. The stylolite is composed of suture membranes on both sides and metasomatic dolomite in the middle. Stylolite comprising metasomatic dolomite with a width of b < 1 mm is exceedingly rare. The infiltration of water primarily weakens the bonding force between the membrane and the bedrock. Stylolite with a width of 1 mm ≤ b ≤ 5 mm and b > 5 mm are more susceptible to sliding and a reduction in the internal friction angle after immersion, due to the dissolution of the dolomite at the edges. The analysis demonstrates that the solubility of metasomatic dolomite is closely related to the reduction in the internal friction angle, which can be employed to quantify the impact of immersion on the stylolite. Based on these findings, a simulation method for assessing the weakening of interface units due to changes in suture solubility was proposed. The deformation curve and failure process calculated by this method are in good agreement with the test results and effectively simulate the frictional sliding of particles during the shear process of the sample. This can serve as a reference and a source of guidance for the simulation of limestone sutures.

Key words： rock mechanics limestone stylolite shear mechanical properties immersion effect numerical simulation

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	Articles by authors
	YANG Chao1
	2
	LI Tianyi1
	2
	WANG Jiao1
	2
	JIANG Haonan2
	XIONG Yun2
	3
	PAN Huixiong3

Cite this article:

YANG Chao1,2,LI Tianyi1, et al. Degradation mechanism and equivalent simulation method of shear strength of limestone stylolite under immersion[J]. , 2025, 44(6): 1438-1449.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2024.0933 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I6/1438

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