岩体结构面抗剪强度尺寸效应联合试验系统及初级应用研究

doi:10.13722/j.cnki.jrme.2020.1215

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Abstract The size effect of rock joint shear strength is a basic research issue in the field of rock mechanics and engineering geology. Due to the lack of mature direct shear test equipment on series size specimens at home and abroad，the research process on shear strength size effect of rock joints is slow. In this paper，a shear strength size effect direct shear combined test system of rock joints is developed，and the key technologies and methods are put forward such as fast conversion of multi-scale jointed specimens，classification of load measurement and control system，equivalence check of overlapping specimens，dynamic detection in testing process and shear loss measurement of structural planes，providing a basis experimental support platform for investigating the size effect of rock joint shear strength and other key scientific issues. The preliminary application results of the developed test system are demonstrated by two-level direct shear apparatus. It is shown that the test system can solve the problem of automatic transformation of specimens in the range of 100 times of the rock joint size from 10 cm×10 cm to 100 cm×100 cm，involving the process of transporting，positioning，loading and resetting of multi-scale specimens. The test system can also solve the problem of accuracy and stability of the measurement control system in the range of 500 times of the load from 2 kN to 1 000 kN. The accuracy level of the test system reaches 0.5 through the identification of a testing organization. The shear strength test results of overlapped specimens of 30 cm×30 cm and 40 cm×40 cm in two-level direct shear apparatus are compared，which shows that the convergence of the two sizes of samples is good. For the specimens with the same structural plane sizes under different loads，the peak values of the tangential load are related to the applied normal loads. For the specimens with different structural plane sizes under the same load，however，the ratio of the tangential load peak value to the normal load has a stable trend，except for a slight fluctuation in a certain size range of the structural plane.

Key words： rock mechanics rock joint shear strength size effect equal precision

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	Articles by authors
	DU Shigui1
	LYU Yuanjun1
	LUO Zhanyou2
	HUANG Man3

Cite this article:

DU Shigui1,LYU Yuanjun1,LUO Zhanyou2, et al. Combined test system for size effect of rock joint shear strength and its primary application research[J]. , 2021, 40(7): 1337-1349.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1215 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I7/1337

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