(1. School of Civil Engineering，North China University of Technology，Beijing 100141，China；2. School of Mechanics and
Civil Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；
3. Yangquan Coal Industry(Group) Co.，Ltd.，Yangquan，Shanxi 045000，China)
Abstract：In order to study the rock-breaking mechanisms and technical advantages of the two-step cutting technology，the stress wave propagation，the effective stress peak and the rock failure type of the two-step cutting technology and the ordinary wedge cutting are compared by numerical simulation. Laboratory test and field test are carried out to analyze the advantages and disadvantages of the two types of cutting technology. The results show that the two types of cutting have two stress peaks，but present obvious difference in the cutting mechanisms due to the different energy release orders of blasting. For the ordinary wedge cutting，the 1st stress peak is created by cutting hole blasting with a form of compressive breaking，while the 2nd stress peak results from mid-hole blasting companied by compressive failure of the bottom rock of the cutting hole and followed by throwing rock. For the two-step cutting，the 1st stress peak is created by mid-hole blasting，leading to compressive failure and creating a pre-cracking zone，and the 2nd stress peak is created by cutting hole blasting，presenting main compressive failure and secondary tensile failure and creating the compressive and tensile failure zones which form a three-zone coupling failure with the pre-cracking zone. Both model experiment and numerical simulation show that the shape of the ordinary wedge cutting is similar to a horn and the rupture surface is 30° with respect to the blasthole，while that the two-step cutting is similar to a prism shape and the rupture surface is 0° with respect to the blasthole. Model experiment and engineering practice also indicate that the two-step cutting technology is superior to the ordinary wedge cutting technology in terms of blasting footage，blasthole utilization rate and bulk rate，and has good applicability.
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2020, Vol. 39 
