低压磨料空气射流破硬岩规律及特征实验研究

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Abstract In response to the problems of low excavation efficiency and rapid wear and tear of drilling tools in hard rock roadways and tunnels，this paper proposes the idea of low pressure abrasive air jet assisted hard rock breaking technology. Fluent-EDEM was used to numerically analyse the structure of the air jet flow field and the abrasive acceleration mechanism under different pressure conditions and to determine the key factors affecting the acceleration of the abrasive. Based on the self-developed abrasive air jet rock breaking system，the influence law of the jet pressure，the abrasive mass flow rate and the erosion time on the effect of erosion crushing granite was studied，and the key factors for improving rock breaking efficiency were clarified. Scanning Electron Microscopy was used to analyse the morphology of granite erosion pits and the hard rock breaking mechanism of low-pressure abrasive air jet was revealed. It is concluded that at a pressure of 2 MPa，the jet can reach 543 m/s and is capable of accelerating the abrasive material to 130 m/s，providing the ability to erode and destroy hard rock. Increasing the difference between air and abrasive velocities as well as the drag force and the virtual mass force on the abrasive is the key to increase the abrasive velocity. Increasing the abrasive mass flow rate and the erosion time will improve rock breaking efficiency more than increasing the pressure. The incident abrasive mainly produces cracks and lip-like edge erosion pits on the rock surface in the forms of impact stress wave and repeated plastic deformation，while the rebound abrasive produces micro-cracks in the form of shear stress，forming flake fracture cracks. The low-pressure abrasive air jet breaking mechanism is the same as that under high-pressure conditions，which theoretically verifies the feasibility of breaking hard rock by low-pressure abrasive air jet.

Key words： rock mechanics abrasive air jet abrasive acceleration hard rock breakage assistant tunnelling erosion wear

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	Articles by authors
	LIU Yong1
	2
	DAI Shuo1
	2
	WEI Jianping1
	2
	ZHANG Hongtu1
	2
	XU Xiangyu1
	2

Cite this article:

LIU Yong1,2,DAI Shuo1, et al. Experimental study on hard rock breaking laws and characteristics by low-pressure abrasive air jet[J]. , 2022, 41(6): 1172-1182.

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https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1172

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