基于跟动加载的岩体结构面抗剪强度试验仪研制

doi:10.3724/1000-6915.jrme.2025.0274

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Abstract The shear strength of rock joints is a critical parameter for the stability analysis of rock engineering, and the use of experimental instruments is essential for accurately determining this parameter. Due to variations in loading methods, constraints, and control strategies among current shear strength testers, discrepancies can arise in test results obtained from the same rock sample. Based on the testing principles outlined in shear strength testing standards, technologies such as normal load-following loading, tangential centering loading, and multimodal force-position conversion control have been proposed, leading to the development of an innovative rock joint shear strength tester. To validate its accuracy and reliability, an experimental study was conducted on the shear strength of a series of flat and undulating structural samples. The results indicated that the tester effectively achieves real-time centering loading under conditions of significant freedom during the slip process of the sample, while exhibiting minimal frictional resistance in the loading mechanisms. Compared to the conventional “upper shear” test method, the shear load curve obtained is smoother and yields more reasonable results. In comparison to the traditional “lower shear” test method, the shear load curve more accurately reflects the influence of structural surface morphology. The multimodal force-position conversion control method simulates the entire process of stress accumulation, release, and maintenance during direct shear tests at various stages, allowing for the precise acquisition of peak shear strength and stable test data, in contrast to the tangential constant rate displacement control method. The findings of this research provide theoretical and technical support for experimental investigations and the development of related testing instruments.

Key words： rock mechanics rock joint direct shear test peak shear strength follow-up loading multimodal control

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	Articles by authors
	LYU Yuanjun1
	DU Shigui1
	ZHU Jiayun1
	TANG Zhicheng2
	LUO Zhanyou1
	2

Cite this article:

LYU Yuanjun1,DU Shigui1,ZHU Jiayun1, et al. Development of a rock joint shear strength tester based on follow-up loading[J]. , 2025, 44(12): 3287-3301.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0274 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I12/3287

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