高宽比及应力波扰动对砂岩块体超低摩擦影响试验研究

doi:10.13722/j.cnki.jrme.2021.0973

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Abstract To reveal the layered rock mass under the action of stress wave disturbance，the rock type size of anomalously low friction mechanism of impact ground pressure influence，five blocks of Shenyang red Yang coal mine roof sandstone were stacked up and down in the loaded cavity of an anomalously low friction testing device. The middle of the block to block was always the working block. The Hs/Hw(0.8–2.0) of different working blocks was used to simulate rock masses of different structural levels or different degrees of fragmentation in the same structural level. The disturbance effects of blasting，roof fracture and concentrated mining were simulated by applying stress wave disturbance Pv(frequency 0–10 Hz，amplitude 0–1 MPa) to the block model system. Axial compression Fv and horizontal impact Fh were applied to simulate the impact of overburden pressure and roof fracture respectively，and the anomalously low friction tests of sandstone blocks with different height-width ratios were carried out under stress wave disturbance. With the height-width ratio as the representation index reflecting the size of the rock block，the disturbance frequency and amplitude of the stress wave as the representation index reflecting the disturbance effect，and the horizontal displacement of the working block as the representation index reflecting the intensity of anomalously low friction effect. The effects of height-width ratio and stress wave disturbance on anomalously low friction intensity and energy evolution characteristics of sandstone working block under the combined action of axial compression，stress wave disturbance and horizontal impact are analyzed. The results show that when the stress wave disturbance，the axial compression and the horizontal impact are constant，the horizontal displacement of the working block decreases with the increase of its height-width ratio，i.e.，the more fractured rock mass under the same stress environment，the greater the intensity of anomalously low friction effect. When the height-width ratio is constant，the horizontal displacement of the working block increases first and then decreases with the increase of stress wave disturbance frequency，and increases with the increase of stress wave disturbance amplitude. Under different test conditions，the maximum kinetic energy per unit mass and power spectral density of the working block increase gradually with the decrease of the height-width ratio. When the height-width ratio is 0.8，the kinetic energy carried by the working block is the maximum，and the intensity of the anomalously low friction effect is relatively large.

Key words： rock mechanics sandstone blocks stress wave disturbance anomalously low friction effect height-width ratio

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	Articles by authors
	LI Liping1
	TANG Lei1
	PAN Yishan2
	JU Xiangyu1
	ZHANG Haitao1

Cite this article:

LI Liping1,TANG Lei1,PAN Yishan2, et al. Experimental study on effect of height-width ratio and stress wave disturbance on anomalously low friction of sandstone blocks [J]. , 2022, 41(7): 1384-1393.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0973 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I7/1384

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