STATIC CRUSHING DIRECTIONAL ANCHOR WITHDRAWAL METHOD AT END OF LARGE-MINING-HEIGHT WORKING FACE

• Main Authors: WANG, Jiangning, LI, Xiaogang, WANG, Dongdong, TIAN, Bin, MO, Zhenghu, REN, Yuanda, GAO, Chao, WU, Jun, WANG, Fuqi, ZHANG, Hua, LI, Zhixiang, CHEN, Jianhua, WANG, Longfei, LI, Xuandong
• Format: Patent
• Language: English
• Published: 07.03.2024
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

For the problem of difficult roof anchor withdrawal at the end of a working face, a static crushing directional anchor withdrawal method at the end of a large-mining-height working face is provided. The method includes the following steps: designing key parameters of boreholes for static crushing, including a borehole position, a spacing between boreholes, a borehole depth, and a borehole diameter at the end of a working face; then determining parameters of a static crushing agent grouting technology device for the construction of a static crushing process; and carrying out an anchor withdrawal operation at the end. The method provided by the present disclosure can solve the problem of difficult roof anchor withdrawal at the end of a working face, is beneficial to shortening the hanging roof distance of the working face, preventing the sudden caving of hanging roofs at the upper and lower corners of the working face and the potential safety hazard caused by gas overrun, and guaranteeing the normal use of the mining roadway. The method used in the present disclosure has the advantages of no vibration, no flying stone, no shock wave, no noise, no toxic gas pollution and the like.