反倾角裂隙岩体压剪断裂及破碎特征研究

doi:10.13722/j.cnki.jrme.2017.1319

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Abstract

In order to study how the compression-shear fracture and fragmentation characteristics of rock mass of slope is influenced by counter-inclined flaw，model specimens containing counter-inclined flaw were prepared and compression-shear tests were conducted. The numerical model of fracture mechanics was established to calculate the stress intensity factor of flaw tip. Sieve tests were carried out for the fragments of these specimens after compression-shear tests. The fractal theory was introduced to quantify the compression-shear fragmentation characteristics and its correlation with fracture characteristics was investigated. With the increase of the absolute value of flaw inclination，the shear strength of specimens increases first and then decreases，which breaches the trends of the stress intensity factor of flaw tip and the fractal dimension of fragmentation. The failure generated in the specimen can be classified into three modes，namely mode I(sliding along the flaw)，mode II(interlocking) and mode III(cutting through the flaw). The specimen failing in mode I，has a largest stress intensity factor of the flaw tip，resulting in a lowest stress strength. The specimen failing in mode II，has a lowest stress intensity factor of the flaw tip，resulting in a largest stress strength. The specimen failing in mode III，has an intermediate stress intensity factor of the flaw tip，resulting in a stress strength between those in modes I and II. The fragment size distribution of fragments under the compression-shear tests exhibits significant fractal property. The fractal dimensions of these fragmentations are in the range of 2.06 to 2.59，which is similar to those in the fault cores There exists negative correlation between the shear strength of specimen and the fractal dimension of fragmentation. The compression-shear fragmentation characteristics of rock mass are closely related to the flaw geometry，stress condition and fracture characteristics.

Key words： rock mechanics counter-inclined flaw compression-shear fracture shear strength stress intensity factor fragmentation fractal dimension

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	Articles by authors
	ZHANG Ke1
	2
	CHEN Yulong3
	CHENG Heming2
	FAN Wenchen4

Cite this article:

ZHANG Ke1,2,CHEN Yulong3, et al. Investigation on compression-shear fracture and fragmentation characteristics of rock mass containing counter-inclined flaw[J]. , 2018, 37(S1): 3291-3299.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1319 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3291

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