Surrounding Rock Failure Characteristics and Key Control Technology of Double- sided Mining Roadway.

Mining disturbance is an important influencing factor for the failure of roadway surrounding rock. In general, a main roadway is less affected by the advance mining of a working face. The failure of a main roadway surrounding rock becomes severe when it is affected by double-sided mining. This study explores and analyzes the structural characteristics of a west area main roadway surrounding rock to improve the stability of the main roadway surrounding rock in an area affected by severe stress from double-sided mining. Subsequently, the stress field superposition effect and failure law of a main roadway surrounding rock when the working faces on both sides face the same mining are proposed through numerical analysis with FLAC3D. On this basis, the space trinity control technology of "Key strata + Key part + Key area" is suggested, and the control effect of the main roadway surrounding rock is tested at the end. Results show that the approximate 0-3 m range of the main roadway roof is the key strata controlled by the main roadway roof. When the main roadway is affected by driving, single-sided mining, and double-sided mining, the surrounding rock stress increases gradually, and the horizontal stress increase is much larger than the vertical stress increase. Maximum horizontal stress and maximum vertical stress concentration factors are 3.8 and 2.6, respectively. When transitioning from single-sided to double-sided mining, the plastic zone at two corners of the roof and floor of the main roadway expands gradually to the middle until the shallow portion is completely destroyed. With the interleaving of the two working faces, the expanded plastic zone of the roof extends axially to the range of approximately ± 150 m from the main roadway, and the floor is within the range of ± 50 m. The plastic zones of the two sides are small. The test roadway remains stable until the mining of both working faces is complete. This study can provide a theoretical reference for the stability control of main roadway surrounding rock under the influence of mining. [ABSTRACT FROM AUTHOR]