1. Guotun Coal Mine Linyi Mining Group Heze Coal and Electricity Co., Ltd., Heze 274704, China; 2. Energy and Mining Engineering College, Shandong University of Science and Technology, Qingdao 266590, China
Abstract：Large diameter borehole pressure relief is a common measure to prevent rock burst in deep high ground stress roadway. In this paper, aiming at the engineering background that large diameter borehole pressure relief is still needed to prevent rock burst when the surrounding rock deformation of 2303 track crossheading in Guotun Coal Mine is serious, the measures of filling pressure relief hole in shallow part to improve the integrity of shallow surrounding rock are put forward. Firstly, according to the elastic theory, the mechanical model of the filled circular hole is established, and the stress expression of any point of the surrounding rock around the filled circular hole is derived, and the quick-setting high-strength material should be selected as the filling material. Then select the engineering experiment site to fill the shallow pressure relief hole and carry out on-site monitoring. The results show that after shallow filling, the axial force of the bolt near the pressure relief hole is higher than that far away from the pressure relief hole, and the deformation of the surrounding rock is obviously reduced. It shows that the shallow filling technology of the pressure relief hole can improve the strength of the shallow surrounding rock while ensuring the pressure relief efficiency of the deep coal body.
郑义宁1，张裕良2，孟圣师1，徐东康1，姜启彬1. 卸压孔浅部填充技术应用与围岩控制效果分析[J]. 煤炭与化工, 2023, 46(12): 14-18.
Zheng Yining1, Zhang Yuliang2, Meng Shengshi1, Xu Dongkang1, Jiang Qibin1. Comparative study on the effects of organic acid and inorganic acid on the pore structure and mineral composition of coal. CCI, 2023, 46(12): 14-18.
