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Cutting Characteristic and Non-explosive Mechanized Rock-breakage Practice of Deep Hard Rock
Received date: 2021-02-07
Revised date: 2021-05-22
Online published: 2021-12-17
The factors such as stress conditions，ore-rock properties and breakage parameters significantly affect the cutting characteristics of deep hard rock，which are also the key factors to determine the successful application of non-explosive mechanized mining. According to the three types of stress conditions of biaxial （single-face excavation），uniaxial （pillar） and low or even unconfined stress （excavation damage zone around pillar） on the rock mass near the mining operation surface，the influences of the above three types of stress conditions on the static and coupled static-dynamic rock breakage characteristics using a conical pick were systematically investigated. Combined with the established peak force theory and regression model of rock fragmentation using a conical pick，it is found that the hard rock has safe and efficient breakage performance under the conditions of low or no confining pressure. According to the process and mechanism of rock burst induced by the disturbance of rock fragmentation using conical pick under high uniaxial confining stress，the mechanism of rock burst induced by mining disturbance in high stress pillar was revealed. The effects of artificially induced defects，such as loading/unloading-induced damage，pre-slitting and pre-drilling，on rock breakage characteristics using a conical pick were investigated. The results show that the artificially induced defects can effectively improve the cuttability of hard rock，and a complete set of methods for improving the cuttability of hard rock were obtained. A variety of mechanized methods for rock breakage have been tested in the mining field，and a rotary vibration continuous cutting equipment based on pre-slitting in hard ore-rock for stress relief and usage of coupled static-dynamic rock breakage have been proposed. The above research results can provide theoretical basis and field practice experience for the large-scale non-explosive mechanized mining in deep hard rock mine.
Shaofeng WANG , Xibing LI . Cutting Characteristic and Non-explosive Mechanized Rock-breakage Practice of Deep Hard Rock[J]. Gold Science and Technology, 2021 , 29(5) : 629 -636 . DOI: 10.11872/j.issn.1005-2518.2021.05.023
http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-5-629.shtml
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