Taiyuan University of Technology

Xiaoze Wen

Jun Guo

Guorui Feng

Jinwen Bai

Tingye Qi

Pengfei Wang

Yijiang Fan

Chenliang Hao

Jianan Liu

Linjun Zhu

Changquan Wu

Ruipeng Qian

Xu Zhang

Zi Wang

Wenming Feng

Wenbo Huang

Jie Zhang

An electric-pulse fracturing device for hard roof of coal mine based on a self-sealing water bag and an using method thereof are provided. The device includes a power switch, a charging power supply, a current limiting protection resistor, an energy storage capacitor and a high-voltage electric pulse switch connected in sequence. The energy storage capacitor is connected with an end of a gas gap switch, an other end of the gas gap switch is connected with an assembled self-sealing water bag high-voltage electric pulse electrode structure through a high-voltage cable, and the electrode structure is fixed through an assembly rod. The self-sealing water bag high-voltage electric pulse electrode structure includes a self-sealing water bag and an electrode structure capable of focusing shock wave energy, and the number of the self-sealing water bag high-voltage electric pulse electrode structure depends on fracturing effect.

Electric-pulse fracturing device and method for hard roof of coal mine based on self-sealing water bag

A method for carrying out grouting between adjacent gateroads in internal-staggered split-level coal mining. A return air gateroad of a stoping face and an inlet air gateroad of a heading face are not on the same level. The return air gateroad of the stoping face is arranged along a roof of a coal seam. The inlet air gateroad of the heading face is arranged along a floor of the coal seam. There is a height difference between the return air gateroad and the inlet air gateroad in a vertical direction. During the construction process, the inlet air gateroad is excavated at a delay distance of 180-200 meters from the return air gateroad. The drilling and grouting are performed while excavating the roadway, where grouting holes are arranged in a single row. A device for implementing the method is also provided.

Method and device for carrying out grouting between adjacent gateroads in internal-staggered split-level coal mining

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Taiyuan, China

Xiaoze Wen