Analytical Approach Based on Full-Space Synergy Technology to Optimization Support Design of Deep Mining Roadway

Abstract

The stability of surrounding rock is the basic guarantee of underground space engineering safety. The large deformation of a roadway’s surrounding rock is a very common phenomenon during the underground excavation of coal mine roadways or coal mining, especially in deep soft rock mining roadways. With the increase in mining depth and mining stress, it is very important to prevent disasters caused by surrounding rock deformation. This work aims to conduct an optimization design of roadway support for deep soft rock in coal mines using a full-space synergy control technology. FLAC3D-based orthogonal numerical experiments are adopted to study the influence of bolt parameters and plastic yield zone variation on the deformation of roadway surrounding rock, which provides a basis for optimizing the support design of coal mine roadways. According to the results of the numerical analysis, the optimal support parameters are determined as 20 mm, 2.2 m and 700–900 mm for diameter, length and interval of the bolt, respectively. Finally, the determined bolt-shotcrete net beam support scheme from the full-space synergy control idea is used in a study case. Results illustrate that this study can provide reliable guidance for the stability control of deep soft rock roadways in mining fields under high stress, and it can work well to keep the surrounding rock deformation within the safe limits.

Similar ratio experiment and characteristic analysis of quasi-sandstone

“…With Chinese coal resources into deep mining, deep roadway surrounding rock in high stress, strong mining of the mutual superposition of the role of deep roadway surrounding rock stability control increasingly difficult, surrounding rock grouting reinforcement support has become the mainstream of roadway control (He 2021;Jia et al, 2022a;Jia et al, 2022b;Jing et al, 2022;Li et al, 2022;Wang et al, 2022;Zhang and Yin, 2022). In recent years, physical model tests have been widely used in the field of underground engineering because of the advantages of easy fabrication, controllable size and variables, and low price, so carrying out the raw rock similar material proportioning experiments to prepare raw rock and obtain the similar material proportioning of quasi-sandstone corresponding to the grouted body provides an experimental basis for further research on the slurry seepage diffusion law and grouting reinforcement effect in quasi-sandstone under true triaxial stress environment, which is of deep The seepage flow grouting support of the tunnel surround rock has important practical significance (Lu et al, 2022;Liu et al, 2017;Kang et al, 2020;Zhang et al, 2020).…”