基于代表性取样的节理岩体抗压强度尺寸效应试验研究

doi:10.13722/j.cnki.jrme.2020.0664

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Abstract Representative sampling of different-size samples has a greater influence on the size effect law of jointed rock mass strength. Based on the proposed representative sampling method，series of jointed rock mass models with different sizes are constructed in this paper，and numerical simulation of the size effect on the compressive strength is carried out. The results show that the failure patterns and the stress-strain curves of rock mass samples of different sizes are quite different，and the failure mode and mechanical properties of different size rock masses are reflected by the test results obtained through representative samples，which verifies the feasibility of the representative sampling method. The size effect law of the compressive strength of jointed rock masses with different trace lengths and dip angles are analyzed，showing that the peak compressive strength gradually decreases and tends to be stable as the size increases and that different trace lengths and dip angles have different degrees of reduction in the strength. Further analysis indicates that the dispersion of the compressive strength of small-sized samples is larger while that of large-sized samples is smaller. The representative sampling method has a more obvious effect on the sampling of small-sized samples and can integrally analyze the mechanical properties of jointed rock masses of different sizes. The research work provides an experimental method for the study on size effect.

Key words： rock mechanics jointed rock mass representative sampling size effect compressive strength

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	Articles by authors
	LIU Dan1
	2
	HUANG Man1
	2
	HONG Chenjie1
	2
	CHEN Xuannan1
	2
	DU Shigui1
	2

Cite this article:

LIU Dan1,2,HUANG Man1, et al. Experimental study on size effect of compressive strength of jointed rock mass based on representative sampling[J]. , 2021, 40(4): 766-776.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0664 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I4/766

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