不同孔隙水压条件下完整砂岩剪切力学特性试验研究

doi:10.13722/j.cnki.jrme.2016.0415

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Abstract

Based on the self-developed shear-seepage coupling test device for coal rock，the shear failure experiments of complete sandstone was carried out under normal stress of 2.0 MPa，pore water pressures of 1.0，2.0 and 3.0 MPa respectively. At the same time，the shear fracture surface of different pore water pressures was scanned by the three-dimensional scanner，and it¢s characteristics was analyzed by statistical parameter that was calculated by Matlab software. The results show that：(1) the shear mechanical properties of sandstone will appear“softening” effection under pore water pressure，and the higher pore water pressure is，the lower shear strength of sandstone is， in addition，the deformations of peak shear and the peak normal are smaller. (2) The root mean square of the vertical distance from all points on the shear fracture surface to the base level，the roughness index and the fractal dimension of surface crack decrease with the increase of the pore water pressure，which indicates that the roughness of shear fracture surface decrease with the pore water pressure rising. (3) Through analysis to crack propagation of shear fracture surfaces，it is found that the crack propagation on specimen¢s surfaces can only reflect inner cracks in small range near the surface instead of whole fracture surface in the process of shear test under different pore water pressures.

Key words： rock mechanics sandstone shear strength pore water pressure shear fracture surface statistical parameters

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	Articles by authors
	PENG Shoujian1
	2
	3
	TAN Hu1
	2
	XU Jiang1
	2
	LIU Yixin1
	2
	WU Shankang1
	2
	QU Jiamei1
	2

Cite this article:

PENG Shoujian1,2,3, et al. Experimental study on shear mechanical properties of complete sandstone under different pore water pressures[J]. , 2017, 36(S1): 3131-3139.

URL:

https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.0415 OR https://rockmech.whrsm.ac.cn/EN/Y2017/V36/IS1/3131

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