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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (5): 629-636.doi: 10.11872/j.issn.1005-2518.2021.05.023

• Frontier News Column of Rare and Precious Metals •     Next Articles

Cutting Characteristic and Non-explosive Mechanized Rock-breakage Practice of Deep Hard Rock

Shaofeng WANG(),Xibing LI   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2021-02-07 Revised:2021-05-22 Online:2021-10-31 Published:2021-12-17

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Abstract:

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.

Key words: deep high stress, hard rock, cuttability, rockburst, induced defects, non-explosive mechanized mining

CLC Number: 

  • TD80

Fig.1

Experimental system of rock breakage using conical pick（Li et al.，2018）"

Fig.2

Induced regulation method for deep high stress（Wang et al.，2019a）"

Fig.3

Rockburst processes shot by high-speed camera（Wang et al.，2018，2020）"

Fig.4

Mining test of non-explosive mechanized based on the induced regulation of deep high stress（Wang et al.，2020）"

Fig.5

Innovation mode of mining technology with key transition phases of non-explosive mechanized and intelligentialized mining"

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