Stability Analysis of Roadway Groups under Multi-Mining Disturbances

Abstract

The roadway stability has been regarded as the main challenging issue for safety and productivity of deep underground coal mines, particularly where roadways are affected by coal mining activities. This study investigates the −740 m main roadway in the Jining No. 2 Coal Mine to provide a theoretical basis for the stability control of the main deep roadway affected by disturbances of adjacent working activities. Field surveys, theoretical analyses, and numerical simulations are used to reveal mechanisms of the coal mining disturbance. The field survey shows that the deformation of roadway increases when the work face advances near the roadway group. Long working face mining causes the key strata to collapse based on the key strata theory and then disturbs the adjacent roadway group. When the working face is 100 m away from the stop-mining line, the roadway group is affected by the mining face, and the width roadway protection coal pillar is determined to be about 100 m. Flac3D simulations prove the accuracy of the theoretical result. Through reinforcement and support measures for the main roadway, the overall strength of the surrounding rock is enhanced, the stability of the surrounding rock of the roadway is guaranteed, and the safe production of the mine is maintained.

Tunnel Squeezing Deformation Control and the Use of Yielding Elements in Shotcrete Linings: A Review

“…The use of yielding elements in shotcrete linings for tunnel squeezing deformation control at first glance appears as simple work, however in practice it is rather challenging because of the time-dependent hardening of shotcrete, non-linear mechanical response of yielding elements, and the time and tunnel face-advancement dependent development of rock deformations. A more serious failure would take place remarkably if they are employed incorrectly [ 66 , 67 ]. However, up to now, there still has not been a systematic and comprehensive summary on previous research, which is fundamental for future research leading to a deeper understanding and better application of ductile linings.…”

Large Deformation Characteristics of Surrounding Rock and Support Technology of Shallow-Buried Soft Rock Roadway: A Case Study

“…Roadways experience large deformations, such as layered soft rock roadways [15], cross roadways [16], close coal seam roadways [17], and steeply inclined rock layer roadway [18][19][20] due to complicated geological structures. Mining disturbance also contributes to a dramatic deformation of the roadway [21,22]. Water-based erosion in a water-rich roadway reduces its strength and serviceability [23,24].…”

Analysis on Water Inrush Prevention Mechanism of Paste-Filled Floor above Confined Water

“…Some researchers have analyzed the influencing factors of floor failure in paste-filling face from the perspective of filling strength and filling rate [27,28]. Many researchers analyzed the relationship between floor failure depth and mining height [29][30][31]. Previous studies have established the evaluation formula of paste-filling floor and the relationship between safety factor and filling parameters [32,33].…”