Support principle and flexible cable support technology of deep large deformation roadway

In order to address the severe deformation or failure problem of surrounding rock in deep roadways under “high-strength” or “ultra high-strength” support strength, the Kastner formula and Flac3D numerical simulation were adopted to study the relationship between support resistance and plastic failure of surrounding rock. The results indicate that as the support resistance increases, the plastic failure depth of the surrounding rock generally shows a decreasing trend. However, only when the support resistance reaches more than 2. 3 MPa can the plastic zone depth significantly decrease. Under existing engineering and technical conditions, the increase in support strength has limited control effect on deep large deformation roadways, and thereby targeted control measures need to be proposed. The use of support materials with high extensibility, sustainable support resistance, and adaptability to surrounding rock deformation without breaking is an effective way to control deep large deformation roadways. On this basis, a flexible and applicable anchor cable has been developed for the large deformation control of surrounding rock in deep roadways. The extension rate of the developed anchor cable exceeds 10%, and the impact resistance performance is 1. 25 to 2 times the ordinary, which has demonstrated a good application effect. © 2023 China University of Mining and Technology. All rights reserved.