含不同节理倾角深部巷道砂岩SHPB动态力学破坏特性试验研究

doi:10.13722/j.cnki.jrme.2019.1162

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Abstract In order to investigate the mechanical properties and dynamic failure law of sandstone specimens containing weakly filled joints with various angles in deep roadways under impact loads，the impact tests of sandstone specimens containing 7 kinds of joint angles were carried out by utilizing split Hopkinson pressure bar(SHPB) with diameter of 50 mm. The crack propagation and dynamic failure processes were captured in real time with the help of a high-speed camera. The results indicated that the dynamic compressive strength and peak strain of jointed sandstone decrease first and then increase with increasing the joint angle. Moreover，the plasticity of jointed specimens decreases while brittleness increases with mounting the joint angle. The stress-time curves of specimens containing joint angles of 0°，15° and 30° perform obvious plastic platform section，which is contrary to the specimens containing joint angles of 45°，60°，75° and 90°. The stress-time curve of specimens containing joint angle of 45° shows an obvious“double peak”phenomenon. Furthermore，the joint angle controls the final failure mode of jointed specimens and the failure sequence of joint and rock matrix. The final failure mode of jointed specimens could be divided into three types，i.e.，split tensile failure，combined tensile-shear failure and shear failure. With increasing the joint angle，the failure sequence gradually changes from filled weak joint failure first to rock matrix failure first.

Key words： rock mechanics SHPB sandstone in deep roadway weakly filled joint joint angle dynamic strength failure mode

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	MA Qinyong1
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	SU Qingqing1
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	3
	MA Dongdong1
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	YUAN Pu1
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	3

Cite this article:

MA Qinyong1,2,3, et al. SHPB experimental study on dynamic characteristics and failure behaviors of sandstone containing weakly filled joints with various angles in deep roadways#br#[J]. , 2020, 39(6): 1104-1116.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1162 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I6/1104

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