层状砂岩各向异性力学特性试验研究

doi:10.13722/j.cnki.jrme.2017.1205

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Abstract The anisotropic characteristics of rock mass affect crucially the engineering stability and safety. The uniaxial and triaxial compression tests on 7 kinds of bedding angles(0°，15°，30°，45°，60°，75°，90°) were designed according to the common bedding sandstone in engineering. The results show that the stress-strain curves under different kinds of bedding angles have basically the same shape with a compaction stage，an elastic stage，a yielding stage and a failure stage. The compression stage of the stress-strain curve becomes shorter with the increasing of the bedding angle. Significant anisotropy of the bedding sandstone is observed under the uniaxial and triaxial compression tests. The elastic modulus increases gradually but some mechanical parameters，such as the deformation modulus，compressive strength，cohesion and friction angle，decrease firstly and then increase to exhibit a U-shaped curve as the bedding angle varies from 0° to 90°，and reach the maximum value at 0° or 90°，the minimum value at about 60°. With the increasing of confining pressure，both the difference of mechanical parameters between different bedding angles and the anisotropic characteristics of bedding rock sample decrease gradually. The limitation of confining pressure to the crack and slip of weak bedding face gradually increased，but the effect of weak bedding face to the failure modes of rock sample weakened gradually. The failure modes of bedding sandstone are closely related to the bedding angles and confining pressures，which can be summed up in three types：tensile splitting，shearing slip damage along the weak bedding face，compound shear failure across and along the weak bedding face.

Key words： rock mechanics bedding sandstone weak bedding face anisotropy mechanical characteristics failure modes

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	Articles by authors
	DENG Huafeng
	WANG Wei
	LI Jianlin
	ZHANG Yinchai
	ZHANG Xiaojing

Cite this article:

DENG Huafeng,WANG Wei,LI Jianlin, et al. Experimental study on anisotropic characteristics of bedded sandstone[J]. , 2018, 37(1): 112-120.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1205 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I1/112

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