含单裂纹真实岩石试件断裂模式的力学试验研究

doi:10.13722/j.cnki.jrme.2015.0710

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Abstract In order to study the fracturing characteristics of the rock with a single crack，mechanical test was carried out to the rock specimen with a single pre-existing crack inclined at 45° using the MTS815.03 electrohydraulic servo controlled rock pressure testing machine. The confining pressure of 0，5，10 MPa were separately applied to the rock specimen and the effect on the crack propagation as well as the fracturing mode was analysed. A crack propagation model was established and the secondary cracking angle was obtained based on the maximum radial shearing stress criterion. The obvious precursory information occurred before the initial crack and the obvious stress drop was shown on the stress-strain curve. Wing cracks，secondary coplanar cracks and secondary anti-wing cracks were observed in tests. The initiation angle of wing cracks are about 68°–73°，the inclined anti-wing crack angles are about －119°–－125°.. The calculated theoretical crack angles are 0°，70.5° and －123.8°respectively which are consistent with the test results. The initiation stress is 90%–95% of the peak stress. The compressive strength and the confining pressure of fine sandstone have a good linear relationship of ?c = 2.69?3+61.9 with R2 = 0.97. The confining pressure affected fracturing. The fracturing modes are wing crack and anti-wing crack under no confining pressure，anti-wing crack under 5 MPa of confining pressure，anti-wing crack and secondary coplanar crack under 10 MPa of confining pressure.

Key words： rock mechanics fracturing mode stress drop wing crack secondary crack maximum shear stress of radial direction

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	LIU Weitao1
	SHEN Jianjun2

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LIU Weitao1,SHEN Jianjun2. Experimental study of propagation mode of crack in real rock#br# specimens with a single crack[J]. , 2016, 35(6): 1182-1189.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.0710 OR http://www.rockmech.org/EN/Y2016/V35/I6/1182

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